Bibliografias temáticas / CO2 adsorption and separation

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Literatura científica selecionada sobre o tema "CO2 adsorption and separation"

Autor: Grafiati

Publicado: 15 de fevereiro de 2025

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Artigos de revistas sobre o assunto "CO2 adsorption and separation"

Yan, Junzhi, Yuming Sun, Junxi Cai, Ming Cai, Bo Hu, Yan Yan, Yue Zhang e Xu Tang. "Construction of ZnCdS Quantum-Dot-Modified CeO2 (0D–2D) Heterojunction for Enhancing Photocatalytic CO2 Reduction and Mechanism Insight". Catalysts 14, n.º 9 (6 de setembro de 2024): 599. http://dx.doi.org/10.3390/catal14090599.

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It is important to improve the separation ability of photogenerated electrons and the adsorption capacity of carbon dioxide (CO2) for efficient photoreduction of CO2. Here, we synthesized ZnCdS quantum dots (ZCS-QDs) and cerium dioxide nanosheets (CeO2) using the solvothermal method and calcination method. We combined CeO2 and ZCS-QDs to effectively enhance the charge separation efficiency, and the lifetime of photogenerated electrons was increased 4.5 times. The CO evolution rate of the optimized composite (ZCS-QDs/CeO2) was up to 495.8 μmol g−1 h−1, and it had 100% product selectivity. In addition, the stability remained high after five cycles. The CO2 adsorption capacity of the catalyst surface was observed by in situ FTIR. The test results showed that improving CO2 capture ability and promoting photogenic electron separation had positive effects on enhancing photoreduction of CO2. This study provides a reference for constructing a zero-dimensional–two-dimensional (0D–2D) heterojunction and explores potential CO2 reduction reaction mechanisms.

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Hasegawa, Yasuhisa, Mayumi Natsui, Chie Abe, Ayumi Ikeda e Sean-Thomas B. Lundin. "Estimation of CO2 Separation Performances through CHA-Type Zeolite Membranes Using Molecular Simulation". Membranes 13, n.º 1 (3 de janeiro de 2023): 60. http://dx.doi.org/10.3390/membranes13010060.

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Chabazite (CHA)-type zeolite membranes are a potential material for CO2 separations because of their small pore aperture, large pore volume, and low aluminum content. In this study, the permeation and separation properties were evaluated using a molecular simulation technique with a focus on improving the CO2 separation performance. The adsorption isotherms of CO2 and CH4 on CHA-type zeolite with Si/Al = 18.2 were predicted by grand canonical Monte Carlo, and the diffusivities in zeolite micropores were simulated by molecular dynamics. The CO2 separation performance of the CHA-type zeolite membrane was estimated by a Maxwell–Stefan equation, accounting for mass transfer through the support tube. The results indicated that the permeances of CO2 and CH4 were influenced mainly by the porosity of the support, with the CO2 permeance reduced due to preferential adsorption with increasing pressure drop. In contrast, it was important for estimation of the CH4 permeance to predict the amounts of adsorbed CH4. Using molecular simulation and the Maxwell–Stefan equation is shown to be a useful technique for estimating the permeation properties of zeolite membranes, although some problems such as predicting accurate adsorption terms remain.

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Lyu, Weifeng, Linghui Sun, Lu Wang, Zemin Ji, Sainan Zhou, Yong Chen e Xiaoqing Lu. "Nitrogen Atom-Doped Layered Graphene for High-Performance CO2/N2 Adsorption and Separation". Energies 15, n.º 10 (18 de maio de 2022): 3713. http://dx.doi.org/10.3390/en15103713.

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The development of high-performance CO2 capture and separation adsorbents is critical to alleviate the deteriorating environmental issues. Herein, N atom-doped layered graphene (N-MGN) was introduced to form triazine and pyridine as potential CO2 capture and separation adsorbents via regulation of interlayer spacings. Structural analyses showed that accessible surface area of the N-MGN is 2521.72 m2 g−1, the porosity increased from 9.43% to 84.86%. At ultra-low pressure, N-MGN_6.8 have exhibited a high CO2 adsorption capacity of 10.59 mmol/g at 298 K and 0.4 bar. At high pressure, the absolute adsorption capacities of CO2 in N-MGN_17.0 (40.16 mmol g−1) at 7.0 MPa and 298 K are much larger than that of N-doping slit pore. At 298 K and 1.0 bar, the highest selectivity of CO2 over N2 reached up to ~133 in N-MGN_6.8. The research shows that N doping can effectively improve the adsorption and separation capacity of CO2 and N2 in layered graphene, and the interlayer spacing has an important influence on the adsorption capacity of CO2/N2. The adsorption heat and relative concentration curves further confirmed that the layered graphene with an interlayer spacing of 6.8 Å has the best adsorption and separation ability of CO2 and N2 under low pressure. Under high pressure, the layered graphene with the interlayer spacing of 17.0 Å has the best adsorption and separation ability of CO2 and N2.

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Jingyi Shan, Jingyi Shan, Xiangling Wang Xiangling Wang, Junkai Wang Junkai Wang, Shixuan Zhang Shixuan Zhang e Qianku Hu and Aiguo Zhou Qianku Hu and Aiguo Zhou. "Electric Field Controlled Separation and Capture of CO2 over S-Doped Graphene: A First-Principles Calculation". Journal of the chemical society of pakistan 43, n.º 6 (2021): 623. http://dx.doi.org/10.52568/000964/jcsp/43.06.2021.

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The selective adsorption and capture of CO2 from post-combustion gases carries huge significance for the reduction of greenhouse effect. In this research, the computations of density functional are performed to investigate the CO2 selective adsorption of S-doped graphene in thrall to applied electric field (E-F). Introducing the applied E-F, the adsorption between S-doped graphene and CO2 is strong chemisorption, and CO2 can be effectively captured. Removing the applied E-F, the adsorption restores to physisorption and CO2 is easily desorbed. Therefore, the CO2 seize and clearing can be realized merely by controlling the E-F. Besides, the adsorption energy of N2 (H2O) on S-decorated graphene is positive when introduce the applied E-F. The results demonstrated that S-doped graphene can selectively adsorb CO2 from the post-combustion gases by controlling the E-F.

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Hernández, Miguel Ángel, Karla Quiroz-Estrada, Gabriela I. Hernandez-Salgado, Roberto Ignacio Portillo, Juana Deisy Santamaría-Juárez, Ma de los Ángeles Velasco, Efraín Rubio e Vitalii Petranovskii. "Nanoporosity and Isosteric Enthalpy of Adsorption of CH4, H2, and CO2 on Natural Chabazite and Exchanged". Separations 9, n.º 6 (10 de junho de 2022): 150. http://dx.doi.org/10.3390/separations9060150.

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This paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO2, CH4, and H2 on pores in natural chabazite exchanged with aqueous solutions of Na+, Mg2+, and Ca2+ salts at different concentrations, and with variable time and temperature of treatment. Experimental data of CO2, CH4, and H2 adsorption were treated by the Freundlich and Langmuir equations. Complementarily, the degree of interaction of these gases with these zeolites was evaluated by the evolution of isosteric enthalpy of adsorption. The exchange with Mg2+ and Na+ favors an increase in the adsorption capacity for CO2. while that of Ca2+ and Mg2+ favor adsorption through to H2 and CH4. These cations occupy sites in strategic positions S4 and S4’, which are located in the channels and nanocavities of these zeolites. The presence of Ca2+ and Mg2+ at S4 and S4′ sites causes increased adsorption into the nanocavities and on the external area of the ion-exchanged zeolites. Depending on the conditions of the exchange treatment, Ca2+ and Mg2+, and Na+ were found to be most favorable, well distributed, and accessible for CO2, CH4, and H2 adsorption.

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Wan, Yinji, Yefan Miao, Ruiqin Zhong e Ruqiang Zou. "High-Selective CO2 Capture in Amine-Decorated Al-MOFs". Nanomaterials 12, n.º 22 (17 de novembro de 2022): 4056. http://dx.doi.org/10.3390/nano12224056.

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Amine-functionalized metal-organic framework (MOF) material is a promising CO2 captor in the post-combustion capture process owing to its large CO2 working capacity as well as high CO2 selectivity and easy regeneration. In this study, an ethylenediamine (ED)-decorated Al-based MOFs (named ED@MOF-520) with a high specific area and permanent porosity are prepared and evaluated to study the adsorption and separation of CO2 from N2. The results show that ED@MOF-520 adsorbent displays a superior CO2 capture performance with a CO2/N2 separation factor of 50 at 273 K, 185% times increase in the CO2/N2 separation efficiency in comparison with blank MOF-520. Furthermore, ED@MOF-520 exhibits a moderate-strength interaction with 29 kJ mol−1 adsorption heat for CO2 uptake, which not only meets the requirement of CO2 adsorption but also has good cycle stability. This work provides a promising adsorbent with a high CO2/N2 separation factor to deal with carbon peak and carbon neutrality.

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Yusubov, F. V., I. A. Aliyev e S. N. Guliyeva. "Study of adsorption separation of gas mixtures under non-stationary conditions". Theoretical and Applied Ecology, n.º 2 (25 de junho de 2024): 101–7. http://dx.doi.org/10.25750/1995-4301-2024-2-101-107.

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The influence of the initial concentration, rate and temperature of adsorption on the adsorption separation of gas mixtures (CO2, CH4, N2, H2S) is investigated. Components: N2 – 5%, H2S – 5%, CO2 – 5% and CH4 – 85%. And as an adsorbent granule of clinoptilolite of irregular shape were used. Isothermal adsorption of CO2 was obtained at different temperatures (293, 313, and 323 K). The obtained isotherms of CO2 adsorption showed that with an increase in temperature, the adsorption of CO2 decreased. The type of isotherms corresponds to Langmuir. The output curves of gas mixture adsorption depending on the gas flow rate and various main components of CO2 were also experimentally studied. The output curves of the adsorption of the CO2 component were studied at various gas flow rates of 20, 50, and 80 mL/min. Equilibrium time increases with a decrease in the gas flow rate. Output curves were also obtained depending on the initial CO2 concentrations of 5%, 10% and 20%. It was determined that with a decrease in the initial concentration of CO2, the equilibrium time also increases. Gas mixture components sorbed downwards: H2S→CO2→CH4→N2. The resulting system of model equations describing the adsorption separation of gas mixtures in a fixed adsorbent layer represents a complete mathematical model of the process under unsteady conditions. The obtained regularities of the process of adsorption of gas mixtures testify to the fact that the process takes place under non-stationary conditions. The proposed models for the optimal design of industrial absorbers can be used for adsorption separation of gas mixtures in the conditions of their unsteady flow.

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Yang, Lingzhi, Wenpeng Xie, Qiuju Fu, Liting Yan, Shuo Zhang, Huimin Jiang, Liangjun Li et al. "Highly Selective Separation of C2H2/CO2 and C2H2/C2H4 in an N-Rich Cage-Based Microporous Metal-Organic Framework". Adsorption Science & Technology 2023 (1 de março de 2023): 1–9. http://dx.doi.org/10.1155/2023/4740672.

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The separation of acetylene (C2H2) from carbon dioxide (CO2) and the purification of ethylene (C2H4) from C2H2 are quite essential processes for the chemical industry. However, these processes are challenging due to their similar physical properties, including molecule sizes and boiling points. Herein, we report an N-rich cage-based microporous metal-organic framework (MOF), [Cd5(Tz)9](NO3) (termed as Cd-TZ, TZ stands for tetrazole), and its highly efficient separation of C2H2/CO2 and C2H2/C2H4. Single-component gas adsorption isotherms reveal that Cd-TZ exhibits high C2H2 adsorption capacity (3.10 mmol g-1 at 298 K and 1 bar). The N-rich cages in Cd-TZ can trap C2H2 with a higher isosteric heat of adsorption (40.8 kJ mol-1) than CO2 and C2H4 owing to the robust host-guest interactions between the noncoordinated N atoms and C2H2, which has been verified by molecular modeling studies. Cd-TZ shows a high IAST selectivity for C2H2/CO2 (8.3) and C2H2/C2H4 (13.3). The breakthrough simulations confirm the potential for separating C2H2/CO2 and the purification of C2H4 from C2H2.

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Li, Yao, Shiying Wang, Binbin Wang, Yan Wang e Jianping Wei. "Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation". Nanomaterials 10, n.º 1 (19 de janeiro de 2020): 174. http://dx.doi.org/10.3390/nano10010174.

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Separation of CO2/CH4/N2 is significantly important from the view of environmental protection and energy utilization. In this work, we reported nitrogen (N)-doped porous carbon spheres prepared from sustainable biomass glucose via hydrothermal carbonization, CO2 activation, and urea treatment. The optimal carbon sample exhibited a high CO2 and CH4 capacity, as well as a low N2 uptake, under ambient conditions. The excellent selectivities toward CO2/N2, CO2/CH4, and CH4/N2 binary mixtures were predicted by ideal adsorbed solution theory (IAST) via correlating pure component adsorption isotherms with the Langmuir−Freundlich model. At 25 °C and 1 bar, the adsorption capacities for CO2 and CH4 were 3.03 and 1.3 mmol g−1, respectively, and the IAST predicated selectivities for CO2/N2 (15/85), CO2/CH4 (10/90), and CH4/N2 (30/70) reached 16.48, 7.49, and 3.76, respectively. These results should be attributed to the synergistic effect between suitable microporous structure and desirable N content. This report introduces a simple pathway to obtain N-doped porous carbon spheres to meet the flue gas and energy gas adsorptive separation requirements.

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Ismail, Marhaina, Mohamad Azmi Bustam, Nor Ernie Fatriyah Kari e Yin Fong Yeong. "Ideal Adsorbed Solution Theory (IAST) of Carbon Dioxide and Methane Adsorption Using Magnesium Gallate Metal-Organic Framework (Mg-gallate)". Molecules 28, n.º 7 (28 de março de 2023): 3016. http://dx.doi.org/10.3390/molecules28073016.

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Ideal Adsorbed Solution Theory (IAST) is a predictive model that does not require any mixture data. In gas purification and separation processes, IAST is used to predict multicomponent adsorption equilibrium and selectivity based solely on experimental single-component adsorption isotherms. In this work, the mixed gas adsorption isotherms were predicted using IAST calculations with the Python package (pyIAST). The experimental CO2 and CH4 single-component adsorption isotherms of Mg-gallate were first fitted to isotherm models in which the experimental data best fit the Langmuir model. The presence of CH4 in the gas mixture contributed to a lower predicted amount of adsorbed CO2 due to the competitive adsorption among the different components. Nevertheless, CO2 adsorption was more favorable and resulted in a higher predicted adsorbed amount than CH4. Mg-gallate showed a stronger affinity for CO2 molecules and hence contributed to a higher CO2 adsorption capacity even with the coexistence of a CO2/CH4 mixture. Very high IAST selectivity values for CO2/CH4 were obtained which increased as the gas phase mole fraction of CO2 approached unity. Therefore, IAST calculations suggest that Mg-gallate can act as a potential adsorbent for the separation of CO2/CH4 mixed gas.

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Mais fontes

Teses / dissertações sobre o assunto "CO2 adsorption and separation"

Abbassi, Maria. "Selective CO Adsorption Separation from CO2 via Cu-modified Adsorbents". Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42151.

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CO2 capture and conversion appears to be a prominent solution to mitigate greenhouse gas emissions (GHG) and global warming issue. Among different CO2 conversion approaches, CO2 hydrogenation via reverse water gas shift (RWGS) reaction is one of the most promising technology to convert CO2 to CO. Subsequently, CO is transformed to value added chemicals or liquid fuels. To improve the overall CO2 conversion for RWGS reaction, product separation and recycling is being proposed. In this research, adsorption separation technology has been explored to selectively separate CO from CO2 in RWGS using pressure swing adsorption (PSA) process. To investigate the adsorption capacity and selectivity of CO, different porous materials have been identified for CO separation. In this research, activated carbons, ordered mesoporous silica, and metal organic framework materials were studied. Equilibrium isotherms of CO and CO2 were measured in a gravimetric system at a temperature of 25 °C for pressures up to 20 bar. Preliminary adsorption isotherm results had shown an insufficient CO uptake and low selectivity level compared to CO2, thus not justifying their application for CO separation. Herein, to improve the CO adsorption capacity and selectivity, Cu-based adsorbents were developed using copper (II) chloride (CuCl2) as a precursor to synthesize six different adsorbents. The adsorbents were prepared using two different synthesis methods; the modified polyol method for reduction and nanoparticle deposition of Cu (I) ions, and thermal monolayer auto-dispersion method. Furthermore, different copper (II) loadings were investigated to determine the monolayer dispersion capacity of CuCl2 on the support. The modified adsorbents by copper salt exhibited significantly high CO uptake with large CO/CO2 selectivity, reversing the results obtained before adsorbent modification. Thus, Cubased adsorbents are promising materials for CO separation and recovery from a gaseous mixture containing CO2.

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Wilson, Sean. "Adsorption Separation of CO2 in Low Concentrations for Applications in Direct Air Capture and Excimer Gas Separation". Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40561.

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The overall objective of this thesis is to evaluate the fundamentals of current low concentration CO2 separation technologies and to provide an alternate method using adsorption technology with existing as well as new adsorbents. Two different applications for the adsorption of CO2 are explored; Direct Air Capture (DAC) and excimer gas purification. The investigation of aerogels as possible adsorbent for these applications was also explored. The first application, DAC of CO2 using adsorbents, addresses climate change by reducing the amount of atmospheric CO2 levels that are directly correlated to global warming. Because of DAC being carbon negative, this field has gained significant attention in the literature. DAC as a CO2 reduction strategy was approached in two ways: 1. Chapter 2 investigates capturing and concentrating CO2 from 0.04% in the air to 95% to be able to sequester it into the ground. This research began by doing an adsorbent selection using pure gas gravimetric measurements on seven different commercially available type X zeolites that were determined to have potential for this separation. Breakthrough experiments were then carried out with the most promising zeolite by perturbing the bed with compressed ambient air. In the process studied, a basic four step temperature vacuum swing adsorption (TVSA) cycle was investigated comprising the following steps: pressurization, adsorption, blowdown, and desorption. Four different regeneration temperatures were tested along with four different gas space velocities. With this cycle configuration, CO2 was concentrated to 95% from 0.04% with total capture fractions as high as 81%. This study highlighted methods to reduce the energy consumption per ton of CO2 captured in the system as well as the potential of using low Si/Al ratio faujasite structured zeolites in DAC of CO2 for greenhouse gas reduction. 2. Chapter 3 expands on the research of Chapter 2 by capturing CO2 from 0.04% in the air and concentrating it to high purity CO2 levels where the cost for operating the process will be reimbursed through the value of the produced CO2. The goal of this research was to increase the CO2 to as high as possible because the purer the CO2, the more valuable it is. This research started by conducting an in-depth investigation into the pure gas adsorption of CO2, N2, O2, and Ar on the most promising zeolite from Chapter 2. The data was then fitted to the TD-Toth model which allowed for the evaluation of the TVSA cycle and showed the potential of reducing the pressure and/or elevating the temperature during the blowdown step in order to produce high purity CO2. To confirm this, the TVSA cycle was run on a fixed bed breakthrough experiment where high purity CO2 was produced between a concentration of 99.5% and 99.96% by lowering the blowdown pressure. By controlling the blowdown temperature, the concentration of the product was increased from 99.8% to 99.95%, however with a significant loss of CO2. This effect of N2, O2, and Ar desorbing during the blowdown step with CO2 desorbing during the evacuation step is shown graphically by measuring the concentration and flow rate of the exiting gas species. The results from this study show the potential for producing a valuable product of high purity CO2 from atmospheric concentrations. The second application in this thesis that is explored in Chapter 4 is the purification of trace impurities of CO2, CF4, COF2, and O2 from F2, Kr, and Ne for applications in excimer lasers. Due to the incompatibility of many adsorbents to F2 and HF, aluminas and polymeric adsorbents were selected as potentially compatible materials. To increase the compatibility of these adsorbents, the use of a cryo-cooler was determined to be feasible to precool the feed stream before separation, which increases the adsorption capacity and compatibility of the material to F2 and HF. To determine the adsorption potential in the low concentration of these adsorbents, the concentration pulse chromatographic technique was chosen to determine the Henry’s Law constants of CO2, CF4, and O2. This data was then plotted on the van’t Hoff plot and extrapolated to colder temperatures to determine the benefit of using a cryo-cooler. From this study, it was determined that HayeSep Q was the best polymeric adsorbent with significant adsorption of CO2 at temperatures below -50˚C while being the best performing CF4 adsorbent. AA-300 was the best performing alumina in this study while having significant adsorption of CF4 at temperatures below -135˚C. However, from a compatibility standpoint, both of these materials need to be tested to determine their robustness in the presence of F2 and HF at room and reduced temperatures. Chapters 5 & 6 in this thesis explore the fundamentals of adsorption on aerogels as a prelude to using aerogels as possible adsorbents for DAC of CO2. This investigation into aerogels looks at silica aerogels and carbon aerogels, which are both industrially produced and explores their adsorption with relation to like materials such as silica gel and activated carbons. Both of these Chapters utilize experimentally determined adsorption isotherms of CO2, N2, O2, and Ar as well as characterization to determine adsorption trends in the materials. Some major conclusions for silica aerogels were that common surface modifications to make the material more resilient against water adsorption impacts the adsorption of CO2 significantly with roughly 4 fold difference in adsorption capacity. For carbon aerogels some major conclusions were that the adsorption was increasingly dominated by the heterogeneous nature of the surface at lower pressures and increasingly dominated by the pore size at the higher pressures. Both chapters discuss the adsorption of air along with ideas such as the influence of gas thermal conductivity in the pores with respects to adsorption. L'objectif général de cette thèse est d'évaluer les principes fondamentaux des technologies actuelles de séparation du CO2 à faible concentration et de fournir une méthode alternative utilisant la technologie d’adsorption avec des adsorbants actuels ainsi que d'en découvrir de nouveaux. Deux applications différentes pour l'adsorption du CO2 ont été explorées; la capture directe dans l’air ambient (CAD) et la purification des gaz excimères, ainsi que la recherche d'aérogels comme adsorbant possible pour ces applications. La première application, le CAD du CO2 utilisant des adsorbants, pourrait répondre aux changements climatiques puisque les niveaux de CO2 atmosphérique sont directement corrélés au réchauffement climatique. Dernièrement, le CAD a fait l'objet d'une attention particulière en tant que stratégie de réduction du CO2, par conséquent, deux voies différentes ont été explorées dans cette thèse: 1. Le chapitre 2 étudie la capture et la concentration du CO2 de 0,04% dans l'air à 95% afin de pouvoir l’enfermer dans la terre. Pour ce faire, une sélection d'adsorbant a été effectué en utilisant des mesures gravimétriques à gaz pur sur sept zéolithes de type X disponibles dans le commerce qui ont été déterminés comme ayant un potentiel pour cette séparation. Des expériences révolutionnaires ont ensuite été réalisées avec la zéolite la plus prometteuse en perturbant le lit avec de l'air ambiant comprimé. Dans le processus étudié, un cycle basique à quatre étapes d’adsorption modulée en température et pression (AMTP) a été étudié, comprenant les étapes suivantes: pressurisation, adsorption, purge et désorption. Quatre températures de régénération différentes ont été testées ainsi que quatre vitesses spatiales de gaz différents. Avec cette configuration de cycle, le CO2 était concentré à 95% de 0,04% avec des fractions de capture totales aussi élevées que 81%. Cette étude a mis en évidence des méthodes pour réduire la consommation d'énergie par tonne de CO2 captée dans le système ainsi que le potentiel d'utilisation de zéolithes structurées à base de faujasite à faible rapport Si/Al dans le CAD du CO2 pour la réduction des gaz à effet de serre. 2. Le chapitre 3 approfondit les recherches du chapitre 2 en capturant le CO2 de 0,04% dans l'air et en le concentrant à des niveaux de très haute pureté où le processus sera remboursé par la valeur du CO2 produit. L'objectif de cette partie était d'augmenter la pureté du CO2 le plus possible car plus le CO2 est pur, plus il est précieux. Une enquête approfondie sur l'adsorption de gaz pur de CO2, N2, O2 et Ar sur la zéolite la plus prometteuse du chapitre 2. Les données ont ensuite été ajustées au modèle TD-Toth qui a permis d'évaluer le cycle AMTP et a montré le potentiel de réduire la pression et/ou d'élever la température pendant l'étape de purge afin de produire du CO2 de haute pureté. Pour confirmer cela, le cycle AMTP a été fait par le biais d’une expérience dans un lit fixe où du CO2 de haute pureté a été produit entre une concentration de 99,5% et 99,96% en abaissant la pression de purge. En contrôlant la température de purge, la concentration du produit est passée de 99,8% à 99,95%, mais avec une perte importante de CO2. Cet effet de la désorption de N2, O2 et Ar pendant l'étape de purge avec la désorption du CO2 pendant l'étape d'évacuation est illustré graphiquement en mesurant la concentration et le débit des espèces de gaz sortant. Les résultats de cette étude montrent le potentiel de production d'un produit précieux de CO2 de haute pureté à partir des concentrations atmosphériques. La deuxième application de cette thèse qui est explorée au Chapitre 4 est la purification des traces d'impuretés de CO2, CF4, COF2 et O2 de F2, Kr et Ne pour des applications dans les lasers à excimère. En raison de l'incompatibilité de nombreux adsorbants avec le F2 et le HF, les alumines et les adsorbants polymères ont été sélectionnés comme matériaux potentiellement compatibles. Pour augmenter la compatibilité de ces adsorbants, l'utilisation d'un cryoréfrigérant a été jugée possible pour pré-refroidir le flux d'alimentation avant la séparation, ce qui augmente la capacité d'adsorption et la compatibilité du matériau en F2 et HF. Pour déterminer le potentiel d'adsorption dans la faible concentration de ces adsorbants, la technique de chromatographie pulsée de concentration a été choisie pour déterminer les constantes de la loi de Henry de CO2, CF4 et O2. Ces données ont ensuite été tracées sur le graphique van’t Hoff et extrapolées à des températures plus froides pour déterminer les avantages de l’utilisation d’un cryoréfrigérant. À partir de cette étude, il a été déterminé que HayeSep Q était le meilleur adsorbant polymère avec une adsorption significative de CO2 à des températures inférieures à -50 ° C tout en étant l'adsorbant CF4 le plus performant. L'AA-300 était l'alumine la plus performante de cette étude tout en ayant une adsorption significative de CF4 à des températures inférieures à -135 °C. Cependant, du point de vue de la compatibilité, ces deux matériaux doivent être testés pour déterminer leur robustesse en présence de F2 et de HF à température ambiante et réduite. Les chapitres 5 et 6 explorent les principes fondamentaux de l'adsorption sur les aérogels en prélude à l'utilisation d'aérogels comme adsorbants possibles pour le CAD du CO2. Cette enquête sur les aérogels examine les aérogels de silice et les aérogels de carbone, qui sont tous les deux fabriqués industriellement et explore leur adsorption par rapport à des matériaux similaires tels que le gel de silice et les charbons actifs. Ces deux chapitres utilisent des isothermes d'adsorption déterminés expérimentalement de CO2, N2, O2 et Ar ainsi que la caractérisation pour déterminer les tendances d'adsorption dans les matériaux. Certaines conclusions majeures pour les aérogels de silice étaient que les modifications de surface courantes pour rendre le matériau plus résistant à l'adsorption d'eau ont un impact significatif sur l'adsorption de CO2 avec une différence d'environ 4 fois dans la capacité d'adsorption. Pour les aérogels de carbone, certaines conclusions majeures étaient que l'adsorption était de plus en plus dominée par la nature hétérogène de la surface à des pressions plus faibles et de plus en plus dominée par la taille des pores aux pressions plus élevées. Les deux chapitres discutent de l'adsorption d'air ainsi que des idées telles que l'influence de la conductivité thermique du gaz dans les pores en ce qui concerne l'adsorption.

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Bendt, Stephan [Verfasser]. "Multiscale modelling of adsorption by MOFs - CO2-separation from flue gas and Olefin/Paraffin-separation as examples / Stephan Bendt". Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2020. http://d-nb.info/1224270843/34.

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Peixoto, Hugo Rocha. "Modeling of CO2 separation in post-combustion processes by PSA". Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=14096.

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CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior
Adsorption processes involving carbon dioxide (CO2) capture and sequestration have been objects of different studies. A typical problem is the separation of CO2 from fuel gases emitted in power plants in order to mitigate the global warming effects. Recently, Pressure Swing Adsorption (PSA) technology is being applied to this separation. However, design and analysis of adsorption processes are a difficult task due to the large number of parameters involved. This work studies the dynamics of this separation in activated carbons C141 and WV 1050 through commercial software Aspen Adsorption (AspenTechÂ). First, we evaluated the ability of the software reproducing experimental fixed bed data in C141 reported on literature, considering the mixture 10% of helium (carrier gas), 15% dioxide carbon and 75% nitrogen, molar basis. The results showed satisfactory resemblance to the literature. From a scale-up of the analyzed system, it was sized a PSA apparatus at 298 K operating with two columns and four steps: adsorption, depressurization, purge and repressurization (Skarstrom cycle). High-pressure step was at 3.0 bar and regeneration at 1.1 bar. Fuel gas mixture simulated was composed only of CO2 and N2; the molar fraction of the first component at the feed stream was 15%. The product stream in C141 showed purity and recovery of carbon dioxide from approximately 23% and 60% on a molar basis, respectively. The productivity was 0.72 t CO2 kg-1 year-1. Through the study of design variables such as column diameter and length, feed and purge flow rate, feed composition and step times, the product purity exceeded 30 % and the recovery bordered 75%, with maximum productivity of 1.02 t CO2 kg-1 year-1 for some process settings. The process yields in WV 1050 were 26.5 % purity, 47 % recovery and 0.53 t CO2 kg-1 year-1.
Processos de adsorÃÃo envolvendo a captura e o sequestro de diÃxido de carbono (CO2) vÃm sendo objetos de diferentes estudos. Um dos problemas tÃpicos analisados Ã a separaÃÃo do CO2 a partir dos gases de queima emitidos em plantas energÃticas com o intuito de mitigar os efeitos do aquecimento global. Recentemente, a tecnologia Pressure Swing Adsorption (PSA) estÃ sendo aplicada para este tipo de separaÃÃo. Entretanto, o projeto e a anÃlise de processos de adsorÃÃo sÃo uma tarefa difÃcil devido Ã grande quantidade de parÃmetros envolvidos. Este trabalho estuda a dinÃmica dessa separaÃÃo nos carbonos ativados C141 e WV 1050 atravÃs do software comercial Aspen Adsorption da AspenTechÂ. Inicialmente, foi avaliada a capacidade do software no que diz respeito Ã reproduÃÃo de dados experimentais de leito fixo reportados na literatura, que consideram a mistura como sendo, em base molar, 10 % de hÃlio (gÃs de inerte), 15 % de diÃxido de carbono e 75 % de nitrogÃnio. Os resultados obtidos apresentaram semelhanÃa satisfatÃria aos da literatura para o sÃlido C141. A partir de um scale-up desse sistema analisado, foi dimensionada uma PSA a 298 K de duas colunas e quatro passos: adsorÃÃo, despressurizaÃÃo, purga e repressurizaÃÃo (ciclo Skarstrom). A etapa de maior pressÃo ocorre a 3,0 bar e a regeneraÃÃo a 1,1 bar. Considerou-se que o gÃs de queima Ã composto apenas por CO2 e N2, sendo a fraÃÃo molar de alimentaÃÃo do componente de interesse de 15%. Para C141, a corrente de produto apresentou pureza e recuperaÃÃo de diÃxido de carbono de aproximadamente 23 % e 60 % em base molar, respectivamente, com produtividade de 0,72 t CO2 kg-1 ano-1. AtravÃs do estudo de variÃveis de projeto como diÃmetro e comprimento da coluna, vazÃo de alimentaÃÃo e de purga, composiÃÃo de alimentaÃÃo e tempos das etapas do ciclo, a pureza do produto ultrapassou os 30 %, a recuperaÃÃo se aproximou de 75 % e a produtividade mÃxima foi de 1,02 t CO2 kg-1 ano-1 para algumas configuraÃÃes do processo. Os rendimentos para o adsorvente WV 1050 foram: pureza de 26,5 %, recuperaÃÃo de 47 % e produtividade de 0,53 t CO2 kg-1 ano-1.

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Abdollahi, Farhang. "Gas Separation by Adsorption in Order to Increase CO2 Conversion to CO via Reverse Water Gas Shift (RWGS) Reaction". Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23993.

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In this research project, adsorption is considered in conjunction with the reverse water gas shift reaction in order to convert CO2 to CO for synthetic fuel production. If the CO2 for this process can be captured from high emitting industries it can be a very good alternative for reduced fossil fuel consumption and GHG emission mitigation. CO as an active gas could be used in Fischer-Tropsch process to produce conventional fuels. Literature review and process simulation were carried out in order to determine the best operating conditions for reverse water gas shift (RWGS) reaction. Increasing CO2 conversion to CO requires CO2/CO separation downstream of the reactor and recycling unreacted CO2 and H2 back into the reactor. Adsorption as a viable and cost effective process for gas separation was chosen for the CO2/CO separation. This was started by a series of adsorbent screening experiments to select the best adsorbent for the application. Screening study was performed by comparing pure gas isotherms for CO2 and CO at different temperatures and pressures. Then experimental isotherm data were modeled by the Temperature-Dependent Toth isotherm model which provided satisfactory fits for these isotherms. Henry law’s constant, isosteric heat of adsorption and binary mixture prediction were determined as well as selectivity for each adsorbent. Finally, the expected working capacity was calculated in order to find the best candidate in terms of adsorption and desorption. Zeolite NaY was selected as the best candidate for CO2/CO separation in adsorption process for this project. In the last step breakthrough experiments were performed to evaluate operating condition and adsorption capacity for real multi component mixture of CO2, CO, H2 in both cases of saturated with water and dry gas basis. In multi components experiments zeolite NaY has shown very good performance to separate CO2/CO at low adsorption pressure and ambient temperature. Also desorption experiment was carried out in order to evaluate the working capacity of the adsorbent for using in industrial scale and eventually temperature swing adsorption (TSA) process worked very well for the regeneration step. Integrated adsorption system downstream of RWGS reactor can enhance the conversion of CO2 to CO in this process significantly resulting to provide synthetic gas for synthetic fuel production as well as GHG emission mitigation.

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Wilson, Sean M. W. "Adsorption Separation of CO2 from CO in Syngas: Improving the Conversion of the Reverse Water Gas Shift Reaction". Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/33169.

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In this research project, adsorption is considered for the separation of CO2 from CO for applications such as industrial syngas production and in particular to improve the conversion of the Reverse Water Gas Shift (RWGS) process. The use of adsorption technology for these applications requires an adsorbent that can effectively separate out CO2 from a gas mixture containing CO2, CO, and H2. However, adsorption of H2 is insignificant when compared to both CO2 and CO, with only CO2 and CO being the adsorbed species. The adsorption of CO2 and CO was investigated in this work for four major types of industrial adsorbents which include: activated aluminas, activated carbons, silica gels, and zeolites. Zeolites, with their ability to be fine tuned many parameters which may affect adsorption, were investigated in terms of the effect of the cations present, SiO2/Al2O3 ratios, and structure to determine how to optimize adsorption of CO2 while decreasing adsorption of CO. This will help to determine a promising adsorbent for this separation with focus on maximizing the selective adsorption of CO2 over CO. To investigate this separation three scientific experimental methods were used; gravimetric adsorption isotherm analysis, volumetric adsorption isotherm analysis, and packed bed adsorption desorption breakthrough analysis. Gravimetric and volumetric methods allow for testing the adsorbent with the individual species of CO2 and CO. This investigation will let us determine the pure component adsorption capacity, heats of adsorption, regenerability, and basic selectivity. Packed bed adsorption breakthrough experimentation was then carried out on promising adsorbents for the CO2 separation from a mixture of CO2, CO, and H2. These experiments used a gas mixture that would be comparable to that produced from the RWGS reaction to determine the multicomponent gas mixture behaviour for adsorption. Temperature swing adsorption (TSA) with a purge gas stream of H2 was then used to regenerate the adsorbent.

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Garcia, Edder. "CO2 adsorption from synthesis gas mixtures : understanding selectivity and capacity of new adsorbents". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10195.

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Le développement de nouveaux adsorbants écologiques et efficaces pour la séparation du CO2 nécessite un lien quantitatif entre les propriétés des adsorbants et ses propriétés d'adsorption. Dans ce travail, nous développons une méthodologie qui prend en compte explicitement les propriétés des adsorbants, tels que le diamètre de pore, la densité, la forme de pore et la composition chimique. L'objectif est d'établir des corrélations quantitatives entre les paramètres mentionnés ci-dessus et les forces qui gouvernent la physisorption dans les milieux poreux, c'est à dire les interactions van der Waals et les interactions électrostatiques. Ainsi, les propriétés optimales des adsorbants pour la séparation du CO2 sont identifiées. En parallèle à ces études théoriques, une série d'adsorbants potentiellement intéressants pour la séparation du CO2 par PSA ont été testées expérimentalement. Une étude systématique de l'influence du centre métallique sur les séparations de mélanges CO2/CH4 et CO2/CH4/CO a été réalisée sur MOFs présentant sites coordinativement insaturés. Dans le cas des zéolithes, l'effet de la composition chimie (rapport Si / Al) sur les propriétés de séparation a été étudiés. Les capacités cycliques et des sélectivités ont été déterminées par des expériences de perçage. Les matériaux présentant un bon compromis entre la sélectivité et la capacité de travailler dans les conditions typiques de PSA ont été identifiés. Finalement, une comparaison entre la prédiction du modèle d'adsorption et les expériences a été faite
The design of new environmentally friendly and efficient adsorbents for CO2 separation requires a quantitative link between the adsorbent properties and adsorption capabilities. In this work we develop a methodology, which explicitly takes into account the adsorbent properties, such as the pore diameter, density, pore shape and chemical composition. The objective is to establish quantitative correlations between the above-mentioned parameters and the forces that govern physisorption in porous media, i.e. van der Waals forces and electrostatic interactions. Thus, the optimal properties of the adsorbent for CO2 separation are identified. In parallel to these theoretical studies, a series of potentially interesting adsorbents for CO2 separation by PSA were tested experimentally. A systematic study of the influence of the metal center on the separations of CO2/CH4 and CO2/CH4/CO mixtures was carried out on MOFs presenting coordinatively unsaturated sites. In the case of zeolites, the effect of the framework composition (Si/Al ratio) on the separation properties was studied. The cyclic capacities and selectivities were determined by breakthrough experiments. Materials presenting a good compromise between selectivity and working capacity under typical PSA conditions were identified. Finally, a comparison between the prediction of the adsorption model and the breakthrough experiments is carried out

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Lozinska, Magdalena Malgorzata. "Investigation of inorganic porous solids as adsorbents for the separation of carbon dioxide from flue gas". Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3964.

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Porous inorganic solids including mesoporous silicas, zeolites and silicoalumnio-phosphates have been investigated as adsorbents for carbon dioxide, particularly in relation to uptake from flue gases at 0.1 bar and ca. 298 K, but also at higher pressures. The mesoporous silicas SBA-1 and SBA-2, with mesocages separated by narrower windows, have been prepared, calcined at various temperatures and also nitrided with ammonia at high temperature. Nitridation has resulted in framework nitrogen incorporation, but this gave only small increases in the uptake of CO₂ of these mesoporous silicas, which are very low (< 0.2 mmol g⁻¹) at flue gas conditions (0.1 bar, 298 K). A series of cationic forms of the small pore zeolites, chabazite, ZK-5 and Rho, have been prepared by exhaustive cation exchange (and pre-calcination of the as-prepared form of Rho). In addition, a series of ultrastabilised zeolite Rho samples has been prepared to investigate the influence of extra-framework aluminium species on CO₂ uptake. For comparison, the silicoaluminophosphate versions of ZK-5 (SAPO STA-14) and Rho (SAPO(RHO)) have been prepared. Adsorption on Li-, Na-, K- and Ca-forms of chabazite (Si/Al = 3.0) has been related to the crystal structures of their dehydrated forms, as determined by Rietveld refinement against powder X-ray diffraction data (PXRD). For Na- and K-chabazite the structure has been measured in situ by PXRD during CO₂ adsorption. Li-chabazite has the highest uptake from all chabazite cationic forms (4.3 mmol g⁻¹). PXRD of K-chabazite reveals cation migration from eight-membered ring sites to six-membered ring sites upon CO₂ adsorption. Na-chabazite shows partial transformation from rhombohedral to monoclinic symmetry upon prolonged evacuation at high temperature, with resultant non-Type I CO₂ adsorption behaviour. Li-, Na- and K-forms of ZK-5 (Si/Al = 4.16) show high CO₂ uptakes at 0.1 bar and 298 K (Li-ZK-5, 4.7 mmol g⁻¹, which is the highest of the solids measured here). Like all H-forms, H-ZK-5 shows weaker uptake. None of the ZK-5 forms show high selectivity for CO₂ over small hydrocarbons, because cations do not block eight-membered ring windows and the structures do not distort upon dehydration. Uptake of CO₂ on univalent cation forms of zeolite Rho has been studied at low (up to 1 bar) and high (up to 10 bar) pressures. All cationic forms (but not H-Rho) show distortion (Im3̅m to I4̅3m) upon dehydration. Forms of zeolite Rho in which cations occupy window sites in the eight-membered rings between α-cages show hysteresis in their CO₂ isotherms, the magnitude of which (Na⁺,NH₄⁺ < K⁺ < Cs⁺) correlates with the tendency of cations to occupy double eight-membered ring sites rather than single eight-membered ring sites. Additionally, reversible CO₂ uptake using the Zero Length Column method on fully and partially cation exchanged samples has been measured. In situ synchrotron PXRD of CO₂ adsorption on Na-Rho indicates Na cations remain in window sites on the time average, indicating CO₂ uptake must occur by a 'trapdoor mechanism' by which Na cations move away from the windows to allow CO₂ to adsorb. In addition, in situ PXRD reveals the adsorption sites of CO₂ bound cations. Adsorption of small hydrocarbons does not occur on Rho, even at high pressure, indicating that adsorption is selective, and depends on the degree of interaction with the adsorbate rather than simply on the molecular size. Na-Rho is therefore a selective adsorbent for CO₂ over CH₄ with selectivities of 150–25 at 1–9 bar and 298 K, predicted from the single component isotherms, and an uptake of 3.07 mmol g⁻¹ at 0.1 bar. High ‘selectivities' are also observed over K-, Cs- and Ca-forms, examples of a novel type of adsorption selectivity.

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Mohamed, Mona Hanafy. "Organic-Inorganic Hybrid Materials Based on Oxyanion Linkers for Selective Adsorption of Polarizable Gases". Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5811.

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The separation of industrially important gases into pure supplies that can be used for many practical applications is based mainly on energy intensive methods such as the cryogenic distillation which is costly and energy intensive. Therefore other routes have been introduced to industrial separation of gases such as the selective adsorption using porous solid materials. Zeolites and activated carbon are the most widely used recyclable energy-efficient porous solid materials for industrial gas separations, however the low uptake and selectivity hurdles their commercialization in some separation applications. Metal organic frameworks (MOFs) have been extensively studied as solid porous materials in term of gas separations nevertheless the future of MOFs for practical gas separations is considered to be vague and stringent due to their low stability, low capacity and selectivity especially at low partial pressures of the adsorbed gas, the competitive adsorption of the contaminants such as H2O, NOX and SOX, high cost of the organic ligands, besides the challenges of the formulation of MOFs which is very important in the MOFs marketing. In this context we present new porous materials based on inorganic linkers as well as the organic molecules, Organic-Inorganic Hybrid Materials, which were found to conquer the current challenges for the exploitation of MOFs in practical gas separation such as separation of trace and low CO2 concentrations and Xe separation from Xe/Kr mixtures. The work presented herein encompasses the development of novel 48.67 topology metal organic material (MOM) platform of formula [M(bp)2(M'O4)] (M= Co or Ni; bpe= bipyridine-type linkers; M'= W, Mo or Cr) that have been assigned RCSR code mmo based upon pillaring of [M(bp)2] square grids by angular WO42-, MoO42- or CrO42- pillars. Such pillars are unexplored in MOMs. They represent ideal platforms to test the effect of pore size and chemistry upon gas sorption behavior since they are readily fine-tuned and can be varied at their 3-positions (metal, organic linker and the inorganic pillar) without changing the overall structure. Such an approach allows for systematic control of pore size to optimize interactions between the framework and the adsorbent in order to enhance selectivity and/or gas uptake. Interestingly, these nets showed a high chemical stability in air, water, boiling water and in a wide range of pH which is certainly a desirable property in industry and commercialization of MOMs. [Ni(bpe)2(MoO4)] (bpe= 1,2-bis(4-pyridyl) ethane), MOOFOUR-1-Ni, and its chromate analog, CROFOUR-1-Ni, exhibit remarkable CO2 affinity and selectivity, especially at low loading. This behavior can be attributed to exceptionally high isosteric heats of adsorption (Qst) of CO2 in MOOFOUR-1-Ni and CROFOUR-1-Ni of ~56 and ~50 kJ/mol, respectively, at zero loading. These results were validated by modeling which indicate that the electrostatics of such inorganic anions towards CO2 affords favourable attractions to CO2 that are comparable to the effect of unsaturated metal centres. The use of WO42- instead of CrO42- or MoO42- as an angular pillar in mmo topology nets has afforded two isostructural porous nets of formula [M(bpe)2WO4] (M = Co or Ni, bpe=1,2-(4-pyridyl)ethene). The Ni variant, WOFOUR-1-Ni, is highly selective towards CO2 thanks to its exceptionally high isosteric heat of adsorption (Qst) of -65.5 kJ/mol at zero loading. The fine-tunability and the inherent modularity of this platform allow us exquisite design and control over the pore chemistry through the incorporation of different functionalities inside the channels of the networks which was then demonstrated as valuable strategy in terms of carbon dioxide capture at condition relevant to the direct CO2 capture from air. The exploitation of 4,4'-azopyridine in the design and synthesis of CROFOUR-2-Ni, an isostructure of CROFOUR-1-Ni, affords a paradigm shift in the CO2 adsorption properties as exemplified by the enhanced CO2 isosteric heat of adsorption at moderate and high loading in CROFOUR-2-Ni and the superior CO2 selectivity even for trace and low CO2 concentration. The two isostructures, CROFOUR-1-Ni and CROFOUR-2-Ni have been also investigated in term of Xe adsorption and separation from Xe/Kr mixtures. The two structures were found to exhibit the remarkable Xe affinity and selectivity which, together with high stability, good recyclability, low regeneration energy and low cost of the two materials could not only diminish the cost of the Xe and Kr production but also can potentially afford a high purity of the separated gases.

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Keshavarzi, Neda. "Structuring porous adsorbents and composites for gas separation and odor removal". Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-109179.

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Porous zeolite, carbon and aluminophosphate powders have been colloidally assembled and post-processed in the form of monoliths, flexible free standing films and coatings for gas separation and odor removal. Zeolite 13X monoliths with macroporosites up to 50 vol% and a high CO2 uptake were prepared by colloidal processing and sacrificial templating. The durability of silicalite-I supports produced in a binder-free form by pulsed current processing (PCP) were compared with silicalite-I supports produced using clay-binders and conventional thermal treatment. Long-term acid and alkali treatment of the silicalite-I substrates resulted in removal of the clay binder and broadened the size-distribution of the interparticle macropores. Furthermore, strong discs of hydrothermally treated beer waste (HTC-BW) were produced by PCP and the discs were activated by physical activation in CO2 at high temperatures. The activated carbon discs showed high strength up to 7.2 MPa while containing large volume of porosities at all length scales. PCP was further used to structure aluminomphosphate powders (AlPO4-17 and AlPO4-53) into strong functional monoliths. The aluminophosphate monoliths had strengths of 1 MPa, high CO2 uptake and were easy to regenerate. Zeolite Y, silicalite and ZSM5 were selected as potential zeolite adsorbents for removal of sulfur containing compound, e.g. ethyl mercaptan (EM) and propyl mercaptan (PM). A novel processing procedure was used to fabricate free-standing films and coatings of cellulose nanofibrils (CNF) with a high content of nanoporous zeolite; 89 w/w% and 96 w/w%, respectively. Thin flexible free-standing films and coatings of zeolite-CNF on paperboards with thickness around 100 µm and 40 µm, respectively, were produced. Headspace solid phase microextraction (SPME) coupled to gas chromatography- mass spectroscopy (GC/MS) analysis showed that the zeolite-CNF films can efficiently remove considerable amount of odors below concentration levels that can be sensed by the human olfactory system.

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.

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Yang, R. T. Gas separation by adsorption processes. Boston: Butterworths, 1987.

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Yang, R. T. Gas separation by adsorption processes. Singapore: World Scientific, 1997.

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Al-Damkhi, Ali Mohammed. Separation of n-paraffins by selective adsorption. Birmingham: Aston University. Department of Chemical Engineering, 1986.

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Takeuchi, Yasushi. Kyūchakuzai no kaishitsu to bunri sōsa e no ōyō ni kansuru kenkyū. Kawasaki-shi: Meiji Daigaku Kagaku Gijutsu Kenkyūjo, 1993.

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Winter, Franz, Rashmi Avinash Agarwal, Jan Hrdlicka e Sunita Varjani, eds. CO2 Separation, Puriﬁcation and Conversion to Chemicals and Fuels. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3296-8.

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Valencia, Susana, e Fernando Rey, eds. New Developments in Adsorption/Separation of Small Molecules by Zeolites. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63853-5.

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Blender, Karl Frederik. Adsorption Process Development for the Separation of Toxic Gaseous Components. Hamburg: Helmut-Schmidt-Universität, Bibliothek, 2020.

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Zee, Gerard van. Counter current sorption using fiber sorbents: A novel separation technique for water purification in power and space efficient equipment. Delft, Netherlands: Delft University Press, 1996.

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Tsai, Huimin. Separation of nickel from aqueous solution by adsorption onto fungal biomass. Manchester: UMIST, 1995.

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International Institute of Refrigeration. Commission A3. Comparaison avec la cryogénie des procédés PSA et membranes pour la séparation des gaz industriels: Compte rendu de la réunion de la Commission A3 = Comparison between cryogenics and PSA and membrane processes for industrial gas separation : proceedings of the meeting of Commission A3, October 24-25, 1989. Paris, France: Institut international du froid, 1989.

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Capítulos de livros sobre o assunto "CO2 adsorption and separation"

Mollerup, Jørgen M. "Adsorption Isotherms". In Preparative Chromatography for Separation of Proteins, 11–79. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119031116.ch2.

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Li, Chenglong, Chengsi Xie, Yi Zong, Richard Chahine, Tianqi Yang, Feng Ye e Jinsheng Xiao. "Deep Neural Network for Prediction of Adsorbent Selectivity on Hydrogen Purification". In Proceedings of the 10th Hydrogen Technology Convention, Volume 1, 214–21. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_24.

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AbstractWith emergence of new materials, more and more materials are available for adsorption and separation processes. The adsorption selectivity of adsorbent to adsorbate is one of the important indicators in choosing materials. Because the adsorption experiment of the mixture is time-consuming and difficult, the selectivity of the adsorbent is generally calculated by the ideal adsorbed solution theory (IAST). Taking the CO2/H2 gas mixture as an example, this paper proposes a new adsorption selectivity calculation method based on a deep neural network (DNN) with 5 hidden layers, which takes the molar fraction of CO2, adsorption pressure and Langmuir adsorption isotherm parameters as the inputs of DNN. Combining the DNN and the NIST/ARPA-E database to quickly and accurately calculate the adsorption selectivity, the hydrogen purification and carbon dioxide storage materials can be quickly screened.

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Jribi, Skander, Boutheina Zallama e Takahiko Miyazaki. "CFD Simulation of CO2 Adsorption onto Activated Carbon for Gas Separation and Storage Applications". In Lecture Notes in Mechanical Engineering, 187–93. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52071-7_26.

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Venkatesan, Saravanan. "Adsorption". In Separation and Purification Technologies in Biorefineries, 101–48. Chichester, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118493441.ch5.

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Mersmann, Alfons, Matthias Kind e Johann Stichlmair. "Adsorption, Chromatography, Ion Exchange". In Thermal Separation Technology, 483–560. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-12525-6_9.

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Li, Dan, Jianfeng Yao e Huanting Wang. "CO2 Selective Separation Membranes". In Eco- and Renewable Energy Materials, 259–309. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-33497-9_9.

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Nakao, Shin-ichi, Katsunori Yogo, Kazuya Goto, Teruhiko Kai e Hidetaka Yamada. "Membrane for CO2 Separation". In Advanced CO2 Capture Technologies, 65–83. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18858-0_5.

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Jamil, Asif, Muhammad Latif, Alamin Idris Abdulgadir, Danial Qadir e Hafiz Abdul Mannan. "Novel CO2 Separation Membranes". In Sustainable Carbon Capture, 185–208. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003162780-6.

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Wawrzyńczak, Dariusz. "Adsorption technology for CO2 capture". In The Carbon Chain in Carbon Dioxide Industrial Utilization Technologies, 37–62. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003336587-3.

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Candamano, Sebastiano, Alfonso Policicchio, Giuseppe Conte, Ralf Abarca, Catia Algieri, Sudip Chakraborty, Stefano Curcio, Vincenza Calabrò, Raffaele Giuseppe Agostino e Fortunato Crea. "Hybrid Composites for CO2 Adsorption". In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (4th Edition), 185–87. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-51904-8_43.

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Trabalhos de conferências sobre o assunto "CO2 adsorption and separation"

Li, Shuaipeng, Dazhan Jiang, Zetong Li, Neng Guo, Dongdong Zhu, Shengwen Chen e Zhiguo Sun. "Characteristics of cyclic CO2 adsorption after MgO doping with nitrate/carbonate". In Fifth International Conference on Green Energy, Environment, and Sustainable Development, editado por Mohammadreza Aghaei, Hongyu Ren e Xiaoshuan Zhang, 67. SPIE, 2024. http://dx.doi.org/10.1117/12.3044477.

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Mimura, Hitoshi, Minoru Matsukura, Fumio Kurosaki, Tomoya Kitagawa, Akira Kirishima e Nobuaki Sato. "Multi-Nuclide Separation Using Different Types of Zeolites". In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66611.

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Development of selective adsorbents is very important subject for the effective multi-nuclide decontamination related to the severe accident of Fukushima Daiichi Nuclear power Station (Fukushima NPS). In this study, the adsorption properties for nine kinds of zeolites (Zeolite A, Zeolite X, Zeolite Y, Zeolite L, Modified Chabazite, Phillipsite, Erionite, Synthetic Mordenite, Natural Mordenite and Clinoptilolite) are evaluated in the presence of sodium salts, boric acid and seawater. The present study deals with (1) selective adsorption properties for single nuclide ions (Cs+, Sr2+, Eu3+, I−, UO22+, Am3+ and NpO2+), and (2) multi-nuclide adsorption properties of 26 elements (typical elements in Advanced Liquid Processing System (ALPS) in Fukushima NPP-1) for the above zeolites. The distribution coefficient (Kd, ml/g) and uptake (R, %) were estimated by batch method using NaI (Tl) scintillation counter, ICP-AES and AAS. Zeolites with different crystal structures have the diversity of the adsorption selectivity for various radioactive nuclides. Chabazite, mordenite and clinoptilolite with lantern or tunnel structure were very effective for the adsorption of monovalent Cs+ ions even in real seawater. Zeolite A and X with three-dimensional cage structures were effective for the adsorption of divalent Sr2+ and Co2+ ions under the practical condition (30% diluted seawater). Zeolite L was effective for the adsorption of Eu3+ ions under the practical condition. As for I− adsorption, Ag-zeolites are found to be effective, and the uptake (%) of I− (NaI in pure water) for Ag-zeolites was estimated to be above 98% in pure water. As for actinoid adsorption, the distribution profile, Kdvs pH, had a maximum depending on the hydrolysis pH. Zeolite A, Zeolite L and Zeolite X showed an excellent adsorption property for UO22+, Am3+ and NpO2+, respectively. Selective adsorption tendencies of different zeolites were evaluated for 26 elements referred to ALPS. Comparing the uptake results for different zeolites, the following tendency of adsorbability was observed. Mordenite had adsorption selectivity for monovalent alkali metal ions of Rb+ and Cs+. Zeolite A and X exhibited relatively high adsorption selectivity for divalent ions of Sr2+ and Co2+. Zeolite L had adsorption selectivity for trivalent lanthanide ions such as Ce3+ and Eu3+. These tendencies were the same as those without boric acid. Thus, the zeolites with diverse adsorption selectivity are effective for the multi-nuclide decontamination of radioactive contaminated water.

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Zhu, Yujun, Jianhai Zhou, Jun Hu, Honglai Liu e Ying Hu. "Computer Simulation of the Adsorption and Separation of CO2/CH4 and CO2/N2 in C60 impregnated COF-108". In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_213.

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Li, Zhi, e Cheng Peng. "Computer Simulation Study of the Adsorption/Separation Process of CO2/CH4 Mixture on Natural Zeolites". In 2009 International Conference on Energy and Environment Technology. IEEE, 2009. http://dx.doi.org/10.1109/iceet.2009.473.

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Song, Xue, Li’ao Wang, Yunmin Zeng, Xinyuan Zhan, Jian Gong e Tong Li. "Application of activated carbon modified by acetic acid in adsorption and separation of CO2 and CH4". In ADVANCES IN ENERGY SCIENCE AND ENVIRONMENT ENGINEERING II: Proceedings of 2nd International Workshop on Advances in Energy Science and Environment Engineering (AESEE 2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5029774.

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Liu, Liying, Tao Du, Xin Fang, Shuai Che e Wenjun Tan. "Research on the separation process model of pressure swing adsorption for CO2/N2 with zeolite molecular sieve". In 2014 26th Chinese Control And Decision Conference (CCDC). IEEE, 2014. http://dx.doi.org/10.1109/ccdc.2014.6852887.

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Asif, Mohammad, Lei Wang, Randy Hazlett e Galymzhan Serikov. "IAST Modelling of Competitive Adsorption, Diffusion and Thermodynamics for CO2-ECBM Process". In SPE EuropEC - Europe Energy Conference featured at the 83rd EAGE Annual Conference & Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209636-ms.

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Abstract Objective/Scope The CO2 emission is one of the main causes for the global warming and it may be controlled by sequestrating CO2 into the geological formation. The coalbed formation provides a dual advantage for CO2 sequestration as CO2 may be stored in coal forever with enhancing the coalbed methane recovery. Thus, the cost of CO2 sequestration may be offset completely or partially. The main objective of the paper was to comprehend the CO2-ECBM displacement using the three concepts viz. competitive adsorption, diffusion, and thermodynamic modelling of coal Methods, procedure, and process In this paper, the pure gas isotherm on coal for CH4, and CO2 was evaluated using manometric method. The binary gas isotherm or competitive adsorption was studied using IAST modelling. MATLAB code was developed for the solution of IAST model and Newton Raphson approach was followed. The IAST modelling was done by taking 50%/%50 mole fraction of CH4/CO2. By analyzing the binary gas isotherm, the optimum injection pressure was evaluated. On the same injection pressure, co adsorption isotherm was drawn at different mole fraction of CO2 in gas phase. Separation factor was calculated by taking ratio of CO2 and CH4 in the gas and adsorbed phase respectively. Furthermore, adsorption data was used for discussing the sorption kinetics in coal and diffusion coefficient was evaluated. Furthermore, the thermodynamic parameters were also calculated and integrated with above noted parameters for the methane displacement in CO2-ECBM process. Results, observations, and calculations The CO2-ECBM displacement is very much dependent on the competitive adsorption and diffusion process in coal. The surface potential and Henry constant are important parameters for defining the CO2-ECBM displacement. The coadsorption isotherm was drawn at the optimum injection pressure and it shows that methane displacement would be the optimum by taking 11 %/89% mole fraction of CO2 and CH4 for two temperatures i.e., 288 K, 308 K. It is identified through diffusion regime that diffusion coefficient for the binary gas isotherm is the average of the diffusion coefficients of pure CO2 and CH4. Novel/Additive information This is the first kind of study which provides the completely integrated approach for describing the methane displacement in CO2-ECBM process. This novel study promotes our understanding of the complex mechanisms of CO2-ECBM displacement process.

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Lunsamrong, Sunita, Nutnicha Wongnak, Gornsikeid Sahavattarnakorn e Achanai Buasri. "Application of Rice Straw Cellulose for Oil-Water Separation". In The Silpakorn International Conference on Total Art and Science (2nd SICTAS 2023) jointly with the International Conference on Engineering and Industrial Technology 2023 (3rd ICEIT 2023). Switzerland: Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-tshi2a.

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Due to the high annual production of rice, rice straw has become a numerous agricultural waste product. We propose in this paper to produce oil sorbent for oil-water separation from waste rice straw fibers. Rice straw cellulose were extracted using 5 wt.% sodium hydroxide (NaOH) at 90 °C for 2 hours. After washing with water, rice straw fibers were tested with litmus paper until pH was neutral. A 20-minute boil was applied to sticky rice flour and water. A strainer was placed on the boiling sticky rice flour. Rice straw fibers were delicately spun, placed in the sieve, and dried at 60 °C for 24 hours. The identification of rice straw cellulose was accomplished through the utilization of Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). In order to evaluate the oil absorption capacity, it is necessary to introduce rice straw into a designated container. Adsorption was measured at time intervals of 10, 20, and 30 minutes. Cease the act of quantifying temporal intervals beyond the predetermined duration. Extract the specimen from its receptacle and proceed to measure its weight. To maximize the %adsorption, the oil sorbent weight, adsorption time, and contact area were considered. The maximum adsorption capacity of 175.67% was obtained by optimizing the following parameters: oil sorbent weight of 30.10 g, adsorption time of 30 min, and contact area of 6.25 cm2. The oil sorbent, which uses waste rice straw fibers as raw materials, may have a good application possibility in the remediation of oil spills, industrial waste water, and waste water from households.

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Tamburello, David, Bruce Hardy e Martin Sulic. "Multi-Component Separation and Purification of Natural Gas". In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7537.

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Over the past decade, several technical developments (such as hydraulic fracturing) have led to an exponential increase in discovering new domestic natural gas reserves. Raw natural gas composition can vary substantially from source to source. Typically, methane accounts for 75% to 95% of the total gas, with the rest of the gas containing ethane, propane, butane, other higher hydrocarbons, and impurities, with the most common including H2O, CO2, N2, and H2S. All natural gas requires some treatment, if only to remove H2O; however, the composition of natural gas delivered to the commercial pipeline grids is tightly controlled. Sub-quality natural gas reserves, which are defined as fields containing more than 2% CO2, 4% N2, or 4 ppm H2S, make up nearly half of the world’s natural gas volume. The development of sub-quality, remote, and unconventional fields (i.e. landfill gas) can present new challenges to gas separation and purification methods. Adsorbent technologies, such as the use of activated carbons, zeolites, or metal-organic frameworks (MOFs), may hold the key to more efficient and economically viable separation methods. This work proposes to prove the applicability of the multi-component potential theory of adsorption (MPTA) to a real world natural gas adsorbent system to properly characterize the adsorbent’s selectivity for an individual gas component using only the single component isotherms. Thus, the real-world gas separation/purification application of a specific adsorbent for a given gas stream can be obtained simply and effectively without the need for large experimental efforts or costly system modifications until after an initial computational screening of perspective materials has been completed. While the current research effort will use natural gas, which is the world’s largest industrial gas separations application, to validate the MPTA, the tools gained through this effort can be applied to other gas separation effort.

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Chen, Yifei, Anjaiah Nalaparaju e Jianwen Jiang. "Adsorption and Separation of CO2/H2 in Mono-, Di- and Trivalent Cation-Exchanged Zeolite-like Metal-organic Frameworks: Atomistic Simulation Study". In 14th Asia Pacific Confederation of Chemical Engineering Congress. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-1445-1_160.

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Relatórios de organizações sobre o assunto "CO2 adsorption and separation"

Veronica J. Rutledge. Adsorption Model for Off-Gas Separation. Office of Scientific and Technical Information (OSTI), março de 2011. http://dx.doi.org/10.2172/1017866.

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Robert J. Copeland, Gokhan Alptekin, Mike Cesario, Steven Gebhard e Yevgenia Gershanovich. A NOVEL CO2 SEPARATION SYSTEM. Office of Scientific and Technical Information (OSTI), janeiro de 1999. http://dx.doi.org/10.2172/766698.

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Skone, Timothy J. Membrane Separation of CO2 and Hydrocarbons. Office of Scientific and Technical Information (OSTI), outubro de 2012. http://dx.doi.org/10.2172/1509404.

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Ingram, Conrad, e Dinadayalane Tandabany. Engineering Accessible Adsorption Sites in MOFs for CO2 Capture. Office of Scientific and Technical Information (OSTI), junho de 2019. http://dx.doi.org/10.2172/1582449.

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Ingram, Conrad, e Dinadayalane Tandabany. Engineering Accessible Adsorption Sites in MOFs for CO2 Capture. Office of Scientific and Technical Information (OSTI), outubro de 2019. http://dx.doi.org/10.2172/1571173.

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Yang, Ralph T. AIR SEPARATION BY PRESSURE SWING ADSORPTION USING SUPERIOR ADSORBENTS. Office of Scientific and Technical Information (OSTI), agosto de 2001. http://dx.doi.org/10.2172/789503.

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Jerry Y.S. Lin e Matthew Anderson. Dual Phase Membrane for High Temperature CO2 Separation. US: Arizona State University, setembro de 2006. http://dx.doi.org/10.2172/899865.

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Shih, Wei-Heng, e Tejas Patil. DEVELOPMENT OF MESOPOROUS MEMBRANE MATERIALS FOR CO2 SEPARATION. Office of Scientific and Technical Information (OSTI), outubro de 2002. http://dx.doi.org/10.2172/804177.

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Wei-Heng Shih, Tejas Patil e Qiang Zhao. DEVELOPMENT OF MESOPOROUS MEMBRANE MATERIALS FOR CO2 SEPARATION. Office of Scientific and Technical Information (OSTI), março de 2003. http://dx.doi.org/10.2172/812171.

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Jerry Y.S. Lin, Seungjoon Chung e Matthew Anderson. DUAL PHASE MEMBRANE FOR HIGH TEMPERATURE CO2 SEPARATION. Office of Scientific and Technical Information (OSTI), dezembro de 2005. http://dx.doi.org/10.2172/838118.

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