Gotowe bibliografie tematyczne / Gas adsorption and selectivity

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Gotowa bibliografia na temat „Gas adsorption and selectivity”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 7 września 2023

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Artykuły w czasopismach na temat "Gas adsorption and selectivity"

Jiang, Weile, Yong Xia, Aifei Pan, Yunyun Luo, Yaqiong Su, Sikai Zhao, Tao Wang i Libo Zhao. "Facet-Dependent Gas Adsorption Selectivity on ZnO: A DFT Study". Chemosensors 10, nr 10 (21.10.2022): 436. http://dx.doi.org/10.3390/chemosensors10100436.

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Semiconductor-based gas sensors are of great interest in both industrial and research settings, but poor selectivity has hindered their further development. Current efforts including doping, surface modifications and facet controlling have been proved effective. However, the “methods-selectivity” correlation is ambiguous because of uncontrollable defects and surface states during the experiments. Here, as a case study, using a DFT method, we studied the adsorption features of commonly tested gases—CH2O, H2, C2H5OH, CH3COCH3, and NH3—on facets of ZnO(0001¯), ZnO(101¯0) and ZnO(101¯1). The adsorption energies and charge transfers were calculated, and adsorption selectivity was analyzed. The results show ZnO(0001¯) has obvious CH2O adsorption selectivity; ZnO(101¯0) has a slight selectivity to C2H5OH and NH3; and ZnO(101¯1) has a slight selectivity to H2, which agrees with the experimental results. The mechanism of the selective adsorption features was studied in terms of polarity, geometric matching and electronic structure matching. The results show the adsorption selectivity is attributed to a joint effort of electronic structure matching and geometric matching: the former allows for specific gas/slab interactions, the latter decides the strength of the interactions. As the sensing mechanism is probably dominated by gas–lattice interactions, this work is envisioned to be helpful in designing new sensing material with high selectivity.

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Chan Wai, Hoong, Mohd Noor Mazlee, Zainal Arifin Ahmad, Shamsul Baharin Jamaludin, Mohd Azlan Mohd Ishak i Muhammad Shahar Jusoh. "Sustainable Porous Materials for Gas Adsorption Applications; A Concise Review". Advanced Materials Research 795 (wrzesień 2013): 96–101. http://dx.doi.org/10.4028/www.scientific.net/amr.795.96.

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Many new sustainable porous materials were developed for gas adsorption applications. Common materials such as activated carbon, clay materials and metal organic framework (MOF) that utilized as potential porous adsorption materials were studied. The article was also discussed on the fabrication methods of porous materials. Adsorptions of flue gas using porous materials were reviewed. It was found that the adsorption properties of porous materials were highly dependent on surface area, selectivity and impregnation. Low cost porous adsorbents such as clay and fly ash were also reviewed as potential and cost effective materials to be used in industries.

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He, Jiating, i Xu Li. "Metal–Organic Framework for Selective Gas Scavenging". Journal of Molecular and Engineering Materials 04, nr 04 (grudzień 2016): 1640014. http://dx.doi.org/10.1142/s2251237316400141.

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Selective gas adsorption plays an important role in adsorptive separation of gases and scavenging unfavorable or hazardous gases. The use of cost-effective and environmentally friendly materials for selective gas adsorption has become one of the most pressing needs today. The development of new adsorbents is essential but difficult due to the selectivity and efficiency requirements for practical application. As potential scavengers, metal–organic frameworks (MOFs) have drawn great attention. In this review, the current progress of science and technology development of MOFs on selective gas scavenging will be highlighted. Future perspectives for exploring MOFs for practical application will also be put forward.

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Parinyakit, Supatsorn, i Patcharin Worathanakul. "Static and Dynamic Simulation of Single and Binary Component Adsorption of CO2 and CH4 on Fixed Bed Using Molecular Sieve of Zeolite 4A". Processes 9, nr 7 (20.07.2021): 1250. http://dx.doi.org/10.3390/pr9071250.

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The simulation of carbon dioxide (CO2)-methane (CH4) mixed gas adsorption and the selectivity on zeolite 4A using Aspen Adsorption were studied. The influence of temperature ranging from 273 to 343 K, pressure up to 10 bar and various compositions of CO2 in the binary system were simulated. The findings of the study demonstrate that the models are accurate. In addition, the effects of various key parameters such as temperature, pressure, and various compositions of binary gases were investigated. The highest CO2 and CH4 adsorption are found at 273 K and 10 bar in the Langmuir isotherm model with 5.86 and 2.88 mmol/g, respectively. The amount of CO2 adsorbed and the selectivity of the binary mixture gas depends on the composition of CO2. The kinetics of adsorption for pure components of CO2 at high temperatures can reach saturation faster than CH4. The influence of the physical properties of zeolite 4A on kinetic adsorption were also studied, and it was observed that small adsorbent particles, large pore diameter, and large pore volume would enter saturation quickly. The prediction of CO2-CH4 mixed gas adsorption and selectivity on zeolite 4A were developed for further use for commercial gas separation.

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Wu, Chin-Wen, i Shivaji Sircar. "Comments on binary and ternary gas adsorption selectivity". Separation and Purification Technology 170 (październik 2016): 453–61. http://dx.doi.org/10.1016/j.seppur.2016.06.053.

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Dutta, Sujeet, Ronan Lefort, Denis Morineau, Ramona Mhanna, Odile Merdrignac-Conanec, Arnaud Saint-Jalmes i Théo Leclercq. "Thermodynamics of binary gas adsorption in nanopores". Physical Chemistry Chemical Physics 18, nr 35 (2016): 24361–69. http://dx.doi.org/10.1039/c6cp01587e.

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Dubskikh, Vadim A., Konstantin A. Kovalenko, Anton S. Nizovtsev, Anna A. Lysova, Denis G. Samsonenko, Danil N. Dybtsev i Vladimir P. Fedin. "Enhanced Adsorption Selectivity of Carbon Dioxide and Ethane on Porous Metal–Organic Framework Functionalized by a Sulfur-Rich Heterocycle". Nanomaterials 12, nr 23 (1.12.2022): 4281. http://dx.doi.org/10.3390/nano12234281.

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Porous metal–organic framework [Zn2(ttdc)2(bpy)] (1) based on thieno[3,2‑b]thiophenedicarboxylate (ttdc) was synthesized and characterized. The structure contains intersected zig-zag channels with an average aperture of 4 × 6 Å and a 49% (v/v) guest-accessible pore volume. Gas adsorption studies confirmed the microporous nature of 1 with a specific surface area (BET model) of 952 m2·g–1 and a pore volume of 0.37 cm3·g–1. Extensive CO2, N2, O2, CO, CH4, C2H2, C2H4 and C2H6 gas adsorption experiments at 273 K and 298 K were carried out, which revealed the great adsorption selectivity of C2H6 over CH4 (IAST selectivity factor 14.8 at 298 K). The sulfur-rich ligands and double framework interpenetration in 1 result in a dense decoration of the inner surface by thiophene heterocyclic moieties, which are known to be effective secondary adsorption sites for carbon dioxide. As a result, remarkable CO2 adsorption selectivities were obtained for CO2/CH4 (11.7) and CO2/N2 (27.2 for CO2:N2 = 1:1, 56.4 for CO2:N2 = 15:85 gas mixtures). The computational DFT calculations revealed the decisive role of the sulfur-containing heterocycle moieties in the adsorption of CO2 and C2H6. High CO2 adsorption selectivity values and a relatively low isosteric heat of CO2 adsorption (31.4 kJ·mol–1) make the porous material 1 a promising candidate for practical separation of biogas as well as for CO2 sequestration from flue gas or natural gas.

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Ismail, Marhaina, Mohamad Azmi Bustam, Nor Ernie Fatriyah Kari i Yin Fong Yeong. "Ideal Adsorbed Solution Theory (IAST) of Carbon Dioxide and Methane Adsorption Using Magnesium Gallate Metal-Organic Framework (Mg-gallate)". Molecules 28, nr 7 (28.03.2023): 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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Zhang, Xiaoxing, Rongxing Fang, Dachang Chen i Guozhi Zhang. "Using Pd-Doped γ-Graphyne to Detect Dissolved Gases in Transformer Oil: A Density Functional Theory Investigation". Nanomaterials 9, nr 10 (19.10.2019): 1490. http://dx.doi.org/10.3390/nano9101490.

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To realize a high response and high selectivity gas sensor for the detection dissolved gases in transformer oil, in this study, the adsorption of four kinds of gases (H2, CO, C2H2, and CH4) on Pd-graphyne was investigated, and the gas sensing properties were evaluated. The energetically-favorable structure of Pd-Doped γ-graphyne was first studied, including through a comparison of different adsorption sites and a discussion of the electronic properties. Then, the adsorption of these four molecules on Pd-graphyne was explored. The adsorption structure, adsorption energy, electron transfer, electron density distribution, band structure, and density of states were calculated and analyzed. The results show that Pd prefers to be adsorbed on the middle of three C≡C bonds, and that the band gap of γ-graphyne becomes smaller after adsorption. The CO adsorption exhibits the largest adsorption energy and electron transfer, and effects an obvious change to the structure and electronic properties to Pd-graphyne. Because of the conductance decrease after adsorption of CO and the acceptable recovery time at high temperatures, Pd-graphyne is a promising gas sensing material with which to detect CO with high selectivity. This work offers theoretical support for the design of a nanomaterial-based gas sensor using a novel structure for industrial applications.

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Pan, Sudip, Ranajit Saha, Subhajit Mandal, Sukanta Mondal, Ashutosh Gupta, María A. Fernández-Herrera, Gabriel Merino i Pratim K. Chattaraj. "Selectivity in Gas Adsorption by Molecular Cucurbit[6]uril". Journal of Physical Chemistry C 120, nr 26 (28.06.2016): 13911–21. http://dx.doi.org/10.1021/acs.jpcc.6b02545.

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Rozprawy doktorskie na temat "Gas adsorption and selectivity"

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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Gonciaruk, Aleksandra. "Graphene and triptycene based porous materials for adsorption applications". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/graphene-and-triptycene-based-porous-materials-for-adsorption-applications(932755b9-1600-4f64-8683-00844645a58b).html.

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There were three main driving forces behind this thesis: global concern over climate change mainly due to uncontrolled carbon dioxide (CO2) emissions, the excitement over the discovery of graphene and its versatile potential, and the potential to design three-dimensional (3D) or two-dimensional (2D) structures, in our case using unique triptycene molecule. We examined two polymeric materials for CO2 adsorption and suggested simple design of disordered carbons suitable for gas adsorption studies. The approach in each task was to examine structural and adsorption properties of materials using detailed atomistic modelling employing Monte Carlo and Molecular Dynamics techniques and where possible provide experimental measurements to validate the simulations. The thesis is presented as a collection of papers and the work can be divided into three independent projects. The aim of the first project is to utilize graphene as an additive in polymer composites in order to increase separation between the polymer chains increasing available surface area. The matrix used is a polymer of intrinsic microporosity (PIM-1), which possess large surface area and narrow nano-sized ( > 2nm) pore distribution attractive for gas separation membrane applications. Adding a filler can reduce aging of the polymer, and enhance permeability across the membrane, often to the expense of loosing selectivity. Therefore, we investigated the packing of PIM-1 chains in presence of discrete 2D graphene platelets and 3D graphene-derived structures and its effect on composite structure and adsorption properties. We found that additives do not alter structural polymer properties at the molecular level preserving the same adsorption capacity and affinity. Potential permeability increase would benefit from the retention of selectivity in the material. Building on design philosophy of materials with intrinsic microporosity we continued further investigation of 3D graphene-derived structures. The idea is that highly concave molecules or polymer chains pack inefficiently creating microporous materials with sufficient surface area for gas adsorption. 3D propeller-like structures were derived from graphene arms connected through the rigid triptycene and other types of cores. The resulting structures created a large amount of micropores and showed similar CO2/CH4 selectivity to activated carbons reported in the literature. It was shown that rigid triptycene core leads to more open structures. The model was also applied to model commercially available activated carbon to predict n- perfluorohexane adsorption. The fitting to experimental structural information proved to be challenging due to trial and error nature of the approach. Nevertheless, the simple packing procedure and diverse structure design have a great potential to serve as a virtual model for porous carbons that possess pore complexity and does not require any previous experimental data to be build on. The last project concerns CO2 adsorption and selectivity over CH4 and N2 in recently reported triptycene-based polymer. The triptycene shape polymer can form a porous 2D network that can be exfoliated into free-standing sheets and potentially used as a membrane. Sheets stack in the bulk material forming anisotropic channel pores. Additionally it contains fluoro- functional groups, which are known to have a high CO2 affinity. We explored pore structure and chemistry of stacked material for gas adsorption and predicted comparable capacity and CO2 selectivity to other microporous covalent materials such as activated carbons and PIMs. The CH4/N2 selectivity was similar to currently most selective material belonging to MOF family. We showed that fluoro-group have a positive effect on CO2 affinity, however predictions are sensitive to the charges of fluorine atoms assigned by different methods.

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Khaddour, Fadi. "Amélioration de la production de gaz des « Tight Gas Reservoirs »". Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3005/document.

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La valorisation des réservoirs gaziers compacts, dits Tight Gas Reservoirs (TGR), dont les découvertes sont importantes, permettrait d’augmenter significativement les ressources mondiales d’hydrocarbures. Dans l’objectif d’améliorer la production de ces types de réservoirs, nous avons mené une étude ayant pour but de parvenir à une meilleure compréhension de la relation entre l’endommagement et les propriétés de transport des géomatériaux. L’évolution de la microstructure d’éprouvettes qui ont été soumises préalablement à des chargements dynamiques est étudiée. Une estimation de leurs perméabilités avec l’endommagement est tout d’abord présentée à l’aide d’un modèle de pores parallèles couplant un écoulement de Poiseuille avec la diffusion de Knudsen. Nous avons ensuite mené des travaux expérimentaux afin d’estimer l’évolution de la perméabilité avec l’endommagement en relation avec l’évolution de la distribution de tailles de pores. Les mesures de perméabilité sont effectuées sur des cylindres en mortier similaire aux roches tight gas, soumis à une compression uniaxiale. La caractérisation des microstructures des mortiers endommagés est réalisée par porosimétrie par intrusion de mercure. Afin d’estimer l’évolution de la perméabilité, un nouveau modèle hiérarchique aléatoire est présenté. Les comparaisons avec les données expérimentales montrent la capacité de ce modèle à estimer non seulement les perméabilités apparentes et intrinsèques mais aussi leurs évolutions sous l’effet d’un chargement introduisant une évolution de la distribution de taille de pores. Ce modèle, ainsi que le dispositif expérimental employé, ont été étendus afin d’estimer à l’avenir les perméabilités relatives de mélanges gazeux. Le dernier chapitre présente une étude de l’adsorption de méthane dans différents milieux fracturés par chocs électriques. Les résultats, utiles pour l’estimation des ressources en place, ont montré que la fracturation permet de favoriser l’extraction du gaz initialement adsorbé
The valorization of compact gas reservoirs, called tight gas reservoirs (TGR), whose discoveries are important, would significantly increase the global hydrocarbon resources. With the aim of improving the production of these types of gas, we have conducted a study to achieve a better understanding of the relationship between damage and the transport properties of geomaterials. The microstructure evolution of specimens, which were submitted beforehand to dynamic loading, has been investigated. An estimation of their permeability upon damage is first presented with the help of a bundle model of parallel capillaries coupling Poiseuille flow with Knudsen diffusion. Then, we have carried out an experimental work to estimate the permeability evolution upon damage in relation to the evolution of the pore size distribution in uniaxial compression. The measurements of permeability have been performed on mortar cylinders, designed to mimic typical tight rocks that can be found in tight gas reservoirs. Microstructural characterization of damaged mortars has been performed with the help of mercury intrusion porosimetry (MIP). To estimate the permeability evolution, a new random hierarchical model has been devised. The comparisons with the experimental data show the ability of this model to estimate not only the apparent and intrinsic permeabilities but also their evolutions under loading due to a change in the pore size distribution. This model and the experimental set up have been extended to estimate the relative permeabilities of gas mixtures in the future. The final chapter presents a study of the adsorption of methane on different porous media fractured by electrical shocks. The results, concerning the estimation of the in-place resources, have shown that fracturing can enhance the extraction of the initial amount of adsorbed gas

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TAZKRITT, SAID. "Etude du role des supports et promoteurs en reaction co/h : :(2) sur des catalyseurs a base de rhodium". Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13102.

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Etude combinee de la reactivite, de la thermodesorption programmee et du piegeage chimique sur des catalyseurs au rhodium. Le role des promoteurs sur les changements d'activite et de selectivite est aborde. Un nouveau type d'adsorption du monoxyde de carbone peut etre observe. Pour ce nouveau mode d'adsorption, la spectrometrie infra rouge est utilisee

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Battrum, M. J. "Gas separation by adsorption". Thesis, University of Bath, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376289.

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Röck, Frank. "System based selectivity improvements of gas sensor arrays". Aachen Shaker, 2009. http://d-nb.info/995246033/04.

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Becer, Metin Özkan Fehime S. "Gas adsorption in volumetric system/". [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000256.rar.

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Zou, Jie. "Assessment of Gas Adsorption Capacity in Shale Gas Reservoirs". Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75387.

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A study into potential gas shales is conducted to define the controlling factors of gas adsorption and evaluate gas adsorption capacity in shale gas reservoirs. The results from high-pressure adsorption experiment show that temperature, moisture and composition affect the gas adsorption in shale. In this study, a tool is introduced to predict gas adsorption capacity. This study helps to understand the mechanism of gas adsorption and evaluate gas storage in shale gas reservoirs.

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Apolonatos, Georgia. "Gas adsorption with molecular sieve zeolites". Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5907.

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Adsorption kinetics and equilibrium of CH$\sb4$, CO and N$\sb2$ gases were studied on various molecular sieve zeolites. Ethylyne was also tested, yet was found to be incompatible with the molecular sieves under consideration. The gas chromatographic technique was chosen as the method of studying the adsorption by which equilibrium and kinetic parameters are derived by matching the response peak to appropriate mathematical models. It was found that the synthetic zeolites (H-Mordenite, 4A zeolite, 5A zeolite) rather than naturally occurring Chabazite had a higher capacity for the adsorption of all three gases. Pure and binary gas isotherms of CH$\sb4$ and CO with molecular sieve 5A were also studied for the separation of these gases. These isotherms indicated that under the present conditions CO is preferentially adsorbed on the 5A zeolite and the adsorption capacity of the sieve increases with decreased temperature.

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Heslop, Mark J. "Binary gas adsorption in molecular sieves". Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/6861.

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This thesis is concerned with the development of sorption-effect chromatography as a rapid method for the determination of binary gas-mixture adsorption isotherms.There are many alternative non-chromatographic methods but these have inherent disadvantages the direct experimental methods require excessive equilibration times and the predictive methods require the respective pure-component isotherms and an ideal adsorbed phase. A computer simulation has shown that for an alternative chromatographic method, good results will only be obtained if both binary isotherms are close to linear. Sorption-effect chromatography is characterised by the flowrate retention time (TN) which measures the change in column inventory when a perturbation is made to the system. Along with the standard composition retention time (Tx), this extra measurement allows the gradient of each binary isotherm to be evaluated. Subsequent integration will give the respective mixture isotherm. Three gas systems (nitrogen-argon, nitrogen-helium and argon-helium) have been investigated over zeolite 5A at different temperatures. The results confirm that the adsorbed phase amounts decrease, with increasing temperature and that there are degrees of component interaction. Experimentally, thermal fluctuations in the oven will cause noise on the flowrate record making TN determination difficult. Isolation of the column from direct air flow was seen to reduce the noise level. Also, using a computer simulation model, the heat of adsorption for the above zeolite 5A systems will be easily dissipated preventing any unwanted gas temperature rises; the comparatively small column diameter was found to be a significant factor. The employment of delay lines (empty tubes) in various locations has been investigated. To directly determine TN it is necessary to used delay lines downstream of the column. Also, the chromatographic method has been extended to determine mixture isotherms by considering the change in average column pressure rather than the motion of a composition front through the column. Delay lines situated upstream of the column are able to separate these two effects, and preliminary results are satisfactory. However, the use of delay lines anywhere in the system changes the measured retention times and the theory has to be adjusted to account for this.

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Książki na temat "Gas adsorption and selectivity"

Berezkin, V. G. Capillary gas adsorption chromatography. Weinheim: Wiley-VCH Verlag GmbH & Co. KGaA, 2008.

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Berezkin, V. G. Capillary gas adsorption chromatography. Heidelberg: Hüthig Verlag, 1996.

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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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Gas separation by adsorption processes. London: Imperial College Press, 1997.

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Grant Glover, T., i Bin Mu, red. Gas Adsorption in Metal-Organic Frameworks. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2018]: CRC Press, 2018. http://dx.doi.org/10.1201/9780429469770.

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Gas chromatography in adsorption and catalysis. Chichester, West Sussex: Ellis Horwood, 1986.

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Bertoncini, Fabrice. Gas chromatography and 2D-gas chromatography for petroleum industry: The race for selectivity. Paris, France: Editions TECHNIP, 2013.

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Momose, Yoshihiro. Exoemission from Processed Solid Surfaces and Gas Adsorption. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6948-5.

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Pedersen, A. Schroder. Adsorption of methane and natural gas on six carbons. Roskilde: Riso Library, 1989.

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Części książek na temat "Gas adsorption and selectivity"

Allen, Terence. "Gas adsorption". W Particle Size Measurement, 540–96. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0417-0_16.

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Lowell, S., i Joan E. Shields. "Gas adsorption". W Powder Surface Area and Porosity, 7–10. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1_2.

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Lowell, S., Joan E. Shields, Martin A. Thomas i Matthias Thommes. "Gas Adsorption". W Characterization of Porous Solids and Powders: Surface Area, Pore Size and Density, 5–10. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2303-3_2.

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Jansen, Johannes Carolus. "Ideal Gas Selectivity". W Encyclopedia of Membranes, 1019. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_301.

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Jansen, Johannes Carolus. "Ideal Gas Selectivity". W Encyclopedia of Membranes, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_301-1.

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Armstrong, Mitchell, Bohan Shan i Bin Mu. "Thermodynamics of Adsorption". W Gas Adsorption in Metal-Organic Frameworks, 83–108. Boca Raton, FL : CRC Press/Taylor & Francis Group, [2018]: CRC Press, 2018. http://dx.doi.org/10.1201/9780429469770-3.

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Stehmann, Friederike, i Stephan Scholl. "Off Gas Cleaning by Adsorption". W Sustainable Production, Life Cycle Engineering and Management, 187–206. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70572-9_11.

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Wang, Lawrence K., Jerry R. Taricska, Yung-Tse Hung i Kathleen Hung Li. "Gas-Phase Activated Carbon Adsorption". W Air Pollution Control Engineering, 395–420. Totowa, NJ: Humana Press, 2004. http://dx.doi.org/10.1007/978-1-59259-778-9_10.

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Lowell, S., Joan E. Shields, Martin A. Thomas i Matthias Thommes. "Chemisorption: Site Specific Gas Adsorption". W Characterization of Porous Solids and Powders: Surface Area, Pore Size and Density, 213–33. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2303-3_12.

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Stace, A. J., i D. M. Bernard. "Reactions of Molecular Ions in Association with Inert Gas Clusters". W Selectivity in Chemical Reactions, 365–72. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3047-6_20.

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Streszczenia konferencji na temat "Gas adsorption and selectivity"

Qiao, Xiangyu, Qinqiang Zhang i Ken Suzuki. "Development of a Strain-Controlled Graphene-Based Highly Sensitive Gas Sensor". W ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23581.

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Abstract Small-size wearable multi-gas sensor with high selectivity and sensitivity is demanded for detecting various harmful gases with high sensitivity in chemical plants, various mines, volcanos, oil and gas fields. Graphene is considered to be the most promising gas-sensitive material due to its large specific surface area and high electron mobility. Many studies have shown that it has a high sensitivity to many gases such as NH3, CO, NO2, H2O, and so on. However, the lack of gas selectivity limits the further application of graphene to gas sensing field. In this study, a first-principle calculation was used to investigate the effect of strain on the gas adsorption behavior of graphene. As a result, it was found that the adsorption behavior of H2O and CO molecules was changed by strain. The adsorption energy of both gases increased monotonically with strain. For carbon monoxide molecules, desorption occurred when the applied tensile strain reached about 5%. These analytical results clearly indicated that there is a possibility of the high selectivity of plural gases by applying appropriate critical strain at which its adsorption changes to desorption. To verify this result, the strain-controlled sensor using graphene was developed. The sensor is composed of graphene and electrodes mounted on a deformable substrate. The high-quality graphene is synthesized on copper by LPCVD (low pressure chemical vapor deposition), and then transferred to the PDMS (Polydimethylsiloxane) substrate using PMMA (Poly methyl methacrylate) as a support layer. It was found that the graphene was monolayer and successfully transferred to the target substrate. The effect of strain on the adsorption of some gases was validated by measuring the change of the resistivity of graphene under the application of uniaxial strain.

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Wolf, Jeremy, Sepideh Maaref, Sajjad Esmaeili, Benjamin Tutolo i Apostolos Kantzas. "An Experimental Study on the Effects of Competitive Adsorption During Huff-N-Puff Enhanced Gas Recovery". W SPE Canadian Energy Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212716-ms.

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Abstract Gas is stored in tight reservoirs both as a free gas occupying the pores, and as an adsorbed gas on the rock matrix. Adsorbed gas exhibits liquid-like densities resulting in significantly more gas being stored on the rock surface. This research aims to highlight the effects of competitive adsorption during Huff-n-Puff enhanced gas recovery (EGR) on activated carbon to achieve maximum gas recovery. Pure methane was initially adsorbed by the activated carbon sample in four simple pure component adsorption stages. The methane was then produced in a primary production stage, allowing some methane to desorb from the activated carbon. The free and adsorbed methane was then displaced in five subsequent cyclical injection/production stages with a displacing gas, either nitrogen or carbon dioxide. The experiments were conducted at 30 °C, 45 °C, and 80 °C, and the temperature was maintained using a water bath. The purpose of testing a variety of temperatures was to highlight the effect of temperature on competitive adsorption and recovery factors. From the experiments, adsorption capacity was plotted as a function of the isothermal pressure and methane composition. This data was then fitted with the Extended Langmuir model because of its popularity and simplistic approach for multicomponent gas mixtures. It was observed that total adsorption capacity decreased as a function of temperature for both the nitrogen and carbon dioxide displacement experiments. Selectivity ratios were also determined for each experiment. At all temperatures, carbon dioxide had a higher selectivity ratio over methane compared to the selectivity ratio between nitrogen and methane. Selectivity ratios did not correlate with changing temperatures in both sets of experiments. Recovery factors were also determined for each experiment. Incremental recovery factors progressively decreased with each subsequent production stage. Cumulatively, the carbon dioxide experiments exhibited higher recovery at each temperature tested. For these experiments, irreversibilities were not considered due to the authors’ previous experience with single-component adsorption and desorption experiments on activated carbon [1]. To date, there have not been any EGR Huff-n-Puff experiments conducted on highly porous activated carbon samples with a primary focus on the effect of competitive adsorption. This research aims to highlight the effects of temperature and displacement gas type on the competitive adsorption between methane and nitrogen/carbon dioxide and its impact on the recovery factors. By doing so, EGR schemes can be better understood and modeled with improved inputs for competitive adsorption in each injection and production cycle. This will allow for more accurate production forecasting and help minimize the financial risk of costly EGR projects.

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Yin, Meng, Xiangyu Qiao, Qinqiang Zhang, Ken Suzuki i Lei Wang. "Strain-Induced Change of Adsorption Behaviour of Gas Molecules on Graphene Analyzed by Density Functional Method". W ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94892.

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Abstract In Aging society, health monitoring sensors are indispensable for reliable daily care. Graphene has been suggested to be capable of detecting gas compositions in a person’s breath to diagnose sickness down to the ppb-level, because of its large surface-to-volume ratio and high carrier mobility. The resistance of graphene was found to change clearly due to the adsorption of gas molecules such as NH3, NO2, and so on. When plural different molecules adsorb on graphene at the same time, however, it is impossible to identify the adsorbed molecules individually. The development of the selectivity of the adsorbed molecules, therefore, is indispensable for applying this gas-adsorption-induced resistance change of graphene to a health monitoring sensor. In order to improve the selectivity, the interaction between graphene and various gas molecules (CO, H2O, and NH3) with and without applied mechanical strain were calculated using the density functional theory (DFT) method. It was found that the adsorption behaviour of gas molecules on graphene changed under the application of strain and shows different dependence of the adsorbed gas species. Some gas molecules such as CO and NH3 gradually desorbed, while other gas molecule such as H2O, on the contrary, adsorbed more stably under tensile strain. This work revealed that the selectivity could be improved by applying the appropriate mechanical strain to graphene, paving the path for a graphene-based gas sensor in biosensing applications.

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Hirose, Yuto, Xiangyu Qiao, Wangyang Fu, Ken Suzuki i Hideo Miura. "Improvement of the Sensitivity and Selectivity of Gas Molecules of Graphene-Base Gas Sensor With Carbon Nanotubes Under the Application of Strain". W ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-95307.

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Abstract A biochemical sensor using graphene nanoribbons as a sensing element was developed for a new generation highly sensitive and compact multi-gas sensor of human’s breath for the early detection of various diseases. Even though the resistance changes of graphene appeared by adsorption of various gases, it was impossible to identify the gas molecules individually when plural kinds of gas molecules adsorbed on graphene at the same time. No selectivity was confirmed so far. In this study, to improve the sensitivity and selectivity of graphene-base gas sensor, carbon nanotubes (CNTs) were directly synthesized on graphene for increasing the area of the molecular adsorption surface. The synthesis of graphene was carried out inside a low-pressure chemical vapor deposition chamber on a copper catalyst substrate with very high purity. The grown graphene was then, transferred onto a Si/SiO2 substrate. No damage was confirmed in graphene during this transfer process. A thermochemical vapor deposition method was also applied to the production of a CNT layer directly on the GNR sensor elements. The stable ohmic contact between the synthesized CNTs and the base graphene layer was confirmed. The graphene-base gas sensor with a CNT layer showed drastic increase in the sensitivity of gas molecules comparing with a conventional single graphene-base sensor.

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Rondon, Marianna, Yoldes Khabzina, Alejandro Orsikowsky, Jean-Benoit Laudet, He Zhao, Olivier Perraud, Emil Gyllenhammar i Jostein Kolbu. "Proof-Of-Concept: Subsea Dehydration Using TSA Adsorption". W Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/32063-ms.

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Abstract In the current energy transition scenario, gas represents one of the main pillars for a greener energy mix. In 2015, we presented two promising schemes to produce a challenging notional gas field located 2500 meters water depth and 300 km from shore using only subsea processing [1]. The first scheme consists of subsea gas/liquid separation, gas compression and liquid boosting for multiphase export to shore; the second, developing a subsea high-pressure dehydration system for up to 300 Bara, using adsorption, to avoid the use of a monothylene glycol (MEG) loop and export dry gas directly from subsea. Performance of desiccants at such high pressure has not been studied thoroughly and qualification was necessary. This paper presents the proof-of-concept of a subsea dehydration technology at high pressure. Several criteria were used to evaluate the potential technologies: treatment performance, power consumption, production at varying pressure, sensitivity to feed contaminants, CAPEX, OPEX, weight & size, among others. The preferred solution was concluded to be temperature swing adsorption (TSA). Once TSA was selected as the most promising dehydration technology, different laboratory tests were performed and several parameters were identified to screen the potential desiccants: adsorbent working capacity, water/CH4 selectivity, water adsorption energy and regeneration temperature. Finally, a pilot was built and a test matrix was run in order to prove the concept. The adsorption, and specifically a TSA Process, was the technology selected in the first part of the study. The choice was based mainly on the energy efficiency and the technology readiness level. In the second part of this project, the feasibility of the process at high pressure (up to 300 Bara) and its application subsea were proven through experimental tests performed at a laboratory pilot. Characterization tests and water and methane adsorption/desorption isotherms are briefly presented. Based on these results, zeolite, alumina and activated carbon adsorbents were identified. Finally, complete adsorption/desorption cycles at different pressures and temperatures were performed, proving the concept and its potential. This is the first study proving experimentally the concept, and presenting the potential, of the TSA Process for subsea dehydration at high pressure. This is one of the subsea processing building blocks identified in many gas field architectures and it is especially required to produce remote and deep reservoirs at competitive costs.

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Berahim, Nor Hafizah, i Akbar Abu Seman. "CO2 Utilization: Converting Waste into Valuable Products". W SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210729-ms.

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Abstract Carbon dioxide capture, utilization, and storage (CCUS), which includes conversion to valuable products, is a complex modern issue with many perspectives. In recent years, the idea of using carbon dioxide (CO2) as a feedstock for synthetic applications in the chemical and fuel sectors via reduction reactions has piqued interest. If the hydrogen is created using a renewable energy source, catalytic CO2 hydrogenation is the most viable and appealing alternative among the existing CO2-recycling solutions. CO2 hydrogenation has many chemical paths depending on the catalyst, and multiple value-added hydrocarbons can be generated. This research looks into a catalyst development for converting high CO2 gas field into methane and alcohols. The study focused on catalytic conversion of CO2 to methane over Ru based catalyst while in the case of alcohols using Cu based catalyst. Both catalysts were synthesized via impregnation techniques where the aqueous precursors’ solution were impregnated on the oxide supports, stirred, filtered and washed. The samples were then dried, ground and calcined. The synthesized catalysts were characterized using various analytical techniques (e.g., TPR, FESEM, N2 adsorption-desorption, XRD) for their physicochemical properties. The catalytic performance in CO2 hydrogenation was performed using a fixed bed reactor at various factors such as temperature, pressure, feed gas ratio and space velocity. The experimental findings indicate that conversion of CO2 to methane over Ru based catalyst resulted in >84% CO2 conversion with 99% methane selectivity in the range of temperature 280 – 320 °C and at atmospheric pressure. In the case of hydrogenation of CO2 to alcohols, the catalytic performance of Cu based catalyst exhibited CO2 conversion of >11% and selectivity towards alcohols, C1 and C2, both at 4% with reaction temperature of 250 °C and pressure 30 bar. These findings revealed that methane could easily be formed from CO2 as compared to alcohol. However, both technology conversions are dependent on the catalyst selection and its’ activity. Process parameters need to be optimized to maximize targeted product formation and suppress the side products.

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Rhodes, Amy, i Hannah R. Francis. "SODIUM ADSORPTION AND SELECTIVITY COEFFICIENTS FOR CA-NA EXCHANGE ON PEAT: IMPLICATIONS FOR ROAD SALT CONTAMINATION OF PEATLAND SOILS". W GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370885.

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Jaber, Nizar R., Saad Ilyas, Osama Shekhah, Mohamed Eddaoudi i Mohammad I. Younis. "Smart Resonant Gas Sensor and Switch Operating in Air With Metal-Organic Frameworks Coating". W ASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/detc2017-67823.

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We report a resonant gas sensor, uniformly coated with a metal-organic framework (MOF), and excited it near the higher order modes for a higher attained sensitivity. Also, switching upon exceeding a threshold value is demonstrated by operating the resonator near the bifurcation point and the dynamic pull-in instabilities. The resonator is based on an electrostatically excited clamped-clamped microbeam. The microbeam is fabricated from a polyimide layer coated from the top with Cr/Au and from the bottom with Cr/Au/Cr layer. The geometry of the resonator is optimized to reduce the effect of squeeze film damping, thereby allowing operation under atmospheric pressure. The electrostatic electrode is designed to enhance the excitation of the second mode of vibration with the minimum power required. Significant frequency shift (kHz) is demonstrated for the first time upon water vapor, acetone, and ethanol exposure due to the MOF functionalization and the higher order modes excitation. Also, the adsorption dynamics and MOF selectivity is investigated by studying the decaying time constants of the response upon gas exposure.

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Tamburello, David, Bruce Hardy i Martin Sulic. "Multi-Component Separation and Purification of Natural Gas". W 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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Raporty organizacyjne na temat "Gas adsorption and selectivity"

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

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Ivanov, Aleksandr, Sadananda Das, Vyacheslav Bryantsev, Costas Tsouris, Austin Ladshaw i Sotira Yiacoumi. Predicting Selectivity of Uranium vs. Vanadium from First Principles: Complete Molecular Design and Adsorption Modeling. Office of Scientific and Technical Information (OSTI), lipiec 2017. http://dx.doi.org/10.2172/1454410.

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Lyon, Kevin L., Amy K. Welty, Jack Law, Austin Ladshaw, Sotira Yiacoumi i Costas Tsouris. Off-Gas Adsorption Model Capabilities and Recommendations. Office of Scientific and Technical Information (OSTI), marzec 2016. http://dx.doi.org/10.2172/1260462.

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Greaney, Allison, Stephanie Bruffey, Nick Soelberg i Amy Welty. Organic Iodide Adsorption from Dilute Gas Streams. Office of Scientific and Technical Information (OSTI), wrzesień 2021. http://dx.doi.org/10.2172/1831626.

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Netus, B. Adsorption of radionuclides on minerals studies illustrating the effect of solid phase selectivity and of mechanisms controlling sorption processes. Office of Scientific and Technical Information (OSTI), luty 1996. http://dx.doi.org/10.2172/184259.

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Reucroft, P. J., K. B. Patel, W. C. Russell i R. Sekhar. Modeling of Equilibrium Gas Adsorption for Multicomponent Vapor Mixtures. Fort Belvoir, VA: Defense Technical Information Center, sierpień 1985. http://dx.doi.org/10.21236/ada159632.

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Bruffey, Stephanie H., Robert Thomas Jubin i J. A. Jordan. Organic Iodine Adsorption by AgZ under Prototypical Vessel Off-Gas Conditions. Office of Scientific and Technical Information (OSTI), wrzesień 2016. http://dx.doi.org/10.2172/1328332.

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Bruffey, Stephanie H., i Robert Thomas Jubin. Iodine Adsorption by Ag-Aerogel under Prototypical Vessel Off-Gas Conditions. Office of Scientific and Technical Information (OSTI), sierpień 2016. http://dx.doi.org/10.2172/1329760.

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Allendorf, Mark D., Joseph C. Sanders i Jeffery A. Greathouse. Computational investigation of noble gas adsorption and separation by nanoporous materials. Office of Scientific and Technical Information (OSTI), październik 2008. http://dx.doi.org/10.2172/943323.

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Reucroft, P. J., H. K. Patel, W. C. Russell i W. M. Kim. Modeling of Equilibrium Gas Adsorption for Multicomponent Vapor Mixtures. Part 2. Fort Belvoir, VA: Defense Technical Information Center, październik 1986. http://dx.doi.org/10.21236/ada174058.

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