Tesis sobre el tema "N2 capture and conversion"
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Nogalska, Adrianna. "Ambient carbon dioxide capture and conversion via membranes". Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/664718.
Texto completoEl cambio climático causado por el aumento del contenido de CO2 en la atmósfera está causando gran preocupación hoy en día. La constante necesidad de generación de energía verde nos inspiró a desarrollar un sistema fotosintético artificial. El sistema funciona como una hoja, donde el CO2 se capta directamente del aire a través de los poros de la membrana y pasa a los siguientes compartimentos para convertirse finalmente en metanol o otros hidrocarburos y sera utilizado como combustible. El objetivo principal del trabajo es revelar la influencia de los contactores de membrana basados en polisulfona sobre la tasa de captura de CO2 atmosférico mediante absorción química en soluciones acuosas. Las membranas de láminas planas que varían en morfología se prepararon por precipitación y se sometieron a caracterización de morfología interna y de la superficie. La membrana de polisulfona se modificó con una serie de aditivos conocidos por la afinidad de CO2, tales como: nenopartículas de ferrita, carbón activado y enzimas. Además, la compatibilidad entre las membranas y la solución absorbente se evaluó en términos de medidas de hinchamiento y ángulo de contacto. Además, se realizaron estudios preliminares sobre la conversión de CO2 capturada en combustibles con el uso de una unidad electroreductora. Los estudios mostraron que el sistema basado en polisulfona tiene una asimilación de CO2 superior en comparación con el rendimiento de una hoja. Además, los mejores resultados se obtuvieron utilizando una membrana en blanco y sin modificar, lo que proporciona un bajo costo de producción. Además, se logró la conversión de bicarbonato a ácido fórmico, dando un comienzo prometedor para mejorar en el trabajo futuro.
The climate change caused by the increased CO2 content in the atmosphere is raising a lot of concern nowadays. The constant need for sustainable green energy generation inspired us to develop an artificial photosynthetic system. The system works as a leaf, where CO2 is captured directly from air through the membrane pores and passes to the next compartments to be finally converted to methanol or other hydrocarbons and to be further used as fuel in fuel cells. The main scope of the work is to reveal the influence of polysulfone -based membrane contactors on atmospheric CO2 capture rate by chemical sorption into absorbent aqueous solutions. Flat sheet membranes that vary in morphology were prepared by immersion precipitation and undergo internal morphology and surface characterization. The polysulfone membrane was modified with a number of additives known for the CO2 affinity such as: ferrite nenoparticles, activated carbon and enzymes. Moreover, the compatibility between membranes and absorbent solution was evaluated in terms of swelling and contact angle measurements. Additionally, preliminary studies concerning the captured CO2 conversion to fuels were performed with use of electro-reductive unit. Studies showed that the polysulfone based system has superior CO2 assimilation compared to a leaf performance. Moreover, the best results were obtained using blank and unmodified membrane, providing a low production cost. Furthermore, the conversion of bicarbonate to formic acid was achieved, giving a promising start to be improved in future work.
Brandvoll, Øyvind. "Chemical looping combustion : fuel conversion with inherent CO2 capture". Doctoral thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1203.
Texto completoChemical looping combustion (CLC) is a new concept for fuel energy conversion with CO2 capture. In CLC, fuel combustion is split into seperate reduction and oxidation processes, in which a solid carrier is reduced and oxidized, respectively. The carrier is continuously recirculated between the two vessels, and hence direct contact between air and suel is avoided. As a result, a stoichiometric amount of oxygen is transferred to the fuel by a regenerable solid intermediate, and CLC is thus a varient of oxy-fuel combustion. In principle, pure CO2 can be obtained from the reduction exhaust by condensation of the produced water vapor. The termodynamic potential and feasibility of CLC has been studied by means of process simulatons and experimental studies of oxygen carriers. Process simulations have focused on parameter sensitivity studies of CLC implemented in 3 power cycles; CLC-Combined Cycle, CLC-Humid Air Turbine and CLC-Integrated Steam Generation. Simulations indicate that overall fuel conversion ratio, oxidation temperature and operating pressure are among the most imortant process parameters in CLC. A promising thermodynamic potentail of CLC has been found, with efficiencies comparable to, - or better than existing technologies for CO2 capture. The proposed oxygen carrier nickel oxide on nickel spinel (NiONiA1) has been studied in reduction with hydrogen, methane and methane/steam as well as oxidation with dry air. It has been found that at atmosphereic pressure and temperatures above 600° C, solid reduction with dry methane occurs with overall fuel conversion of 92%. Steam methane reforming is observed along with methane cracking as side reactions, yealding an overall selectivity of 90% with regard to solid reduction. If steam is added to the reactant fuel, coking can be avoided. A methodology for long term investigation of solid chemical activity in a batch reactor is proposed. The method is based on time variables for oxidaton. The results for NiONiA1 do not rule out CLC as a viable alternative for CO2 capture, but long term durability studies along with realistic testing of the carrier in a continuous rig is needed to firmly conclude. For comparative purposes a perovskite was synthesized and tested in CLC, under similar conditions as NiONiA1. The results indicate that in a moving bed CLC application, perovskites have inherent disadvantages as compared to simpler compounds, by virtue of low relative oxygen content.
Khurram, Aliza. "Combined CO₂ capture and electrochemical conversion in non-aqueous environments". Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127053.
Texto completoCataloged from the official PDF of thesis.
Includes bibliographical references (pages 234-253).
Carbon capture, utilization, and storage (CCUS) technologies have a central role to play in mitigating rising CO₂ emissions and enabling sustainable power generation. Most industrially mature CCS technologies based on amine chemisorption are highly energy-intensive, consuming up to 30% of the power generating capacity of the plant in order to thermally regenerate the sorbents for continued capture. Moreover, the released CO₂ must additionally be compressed and stored permanently, which adds additional energy penalties and potential risks of release. To address these challenges, this thesis develops a new strategy for integrating CO₂ capture and conversion into a single process stream.
Such an approach, which employs CO₂ in the captured state as the reactant for subsequent electrochemical reactions, eliminates the need for energetically-intensive sorbent regeneration and CO₂ release between capture and utilization steps while potentially providing new solutions for the storage challenge. In the first part of this thesis, a proof-of-concept demonstration of combined CO₂ capture and conversion within a Li-based electrochemical cell is presented. To develop this system, new electrolyte systems were first designed to integrate amines (used in industrial CO₂ capture) into nonaqueous electrolytes. The resulting systems were found to be highly effective in both capturing and activating CO₂ for subsequent electrochemical transformations upon discharge of the cell.
This activity was particularly well-demonstrated in solvents such as DMSO where CO₂ normally is completely inactive, in which the amine-modified electrolytes containing chemisorbed CO₂ were found to enable discharge at high cell voltages (~2.9 V vs. Li/Li⁺) and to high capacities (> 1000 mAh/gc), converting CO₂ to solid lithium carbonate. Formation of a densely-packed, solid phase product from CO₂ is not only logistically attractive because it requires less storage space, but also eliminates the costs and safety risks associated with long-term geological storage of compressed CO₂. In addition, the conversion process generates electricity at point-of-capture, which may help to incentivize integration of the technology with existing point-source emitters. While promising, this initial system exhibited several challenges including slow formation of the active species in solution.
To address this, a suite of experimental and computational methods were employed to elucidate the influence of the electrolyte on electrochemical reaction rates. Reduction kinetics were found to be influenced by alkali cation desolvation energetics, which favors larger alkali cations such as potassium. Through further development, amine-facilitated CO₂ conversion was also demonstrated to be transferrable to other amine- and solvent- systems, opening a potentially large design space for developing improved electrolytes. Furthermore, the effect of operating temperature was investigated to evaluate the potential of this technology to integrate with practical CO₂ capture needs. While higher temperatures (40°C
by Aliza Khurram.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Mechanical Engineering
Kim, Hyung Rae. "Chemical Looping Process for Direct Conversion of Solid Fuels In-Situ CO2 Capture". The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250605561.
Texto completoLiang, Weibin. "Carbon Dioxide Adsorption and Catalytic Conversion in Porous Coordination Polymers". Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14541.
Texto completoTang, Koon T. "Studies of '1'5'8Gd by thermal neutron capture reactions and by IBA-1 model calculations". Thesis, University of Brighton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361584.
Texto completoProvost, Bianca. "An Improved N2 Model for Predicting Gas Adsorption in MOFs and using Molecular Simulation to aid in the Interpretation of SSNMR Spectra of MOFs". Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/31930.
Texto completoRamkumar, Shwetha. "CALCIUM LOOPING PROCESSES FOR CARBON CAPTURE". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1274882053.
Texto completoTong, Andrew S. "Application of the Moving-Bed Syngas Chemical Looping Process for High Syngas and Methane Conversion and Hydrogen Generation". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1390774129.
Texto completoMARCHESE, MARCO. "Conversion of industrial CO2 to value-added fuels and chemicals via Fischer-Tropsch upgrade". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2914540.
Texto completoNoah, Stanley Godfrey. "Evaluation of characters associated with low temperature tolerance, resource capture and conversion of contrasting landraces of Bambara groundnut". Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546532.
Texto completoSolomon, Marcello. "Salen-based Metal Complexes in Solid State Materials as a Platform for the Capture and Conversion of Carbon Dioxide". Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/16585.
Texto completoDaza, Yolanda Andreina. "Closing a Synthetic Carbon Cycle: Carbon Dioxide Conversion to Carbon Monoxide for Liquid Fuels Synthesis". Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6079.
Texto completoBenedetti, Alberto. "Microstructural Characterization of CaO-based Sorbents During CO2 Capture and Sorbent Regeneration". Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3424687.
Texto completoIl presente lavoro di tesi è incentrato sulla caratterizzazione delle proprietà micro-texturali dell’ossido di calcio impiegato come sorbente solido per la cattura della CO2, le quali hanno un ruolo cruciale per quanto concerne le prestazioni del sorbente durante lo stadio di carbonatazione. Lo studio della micro-struttura del sorbente è stata condotta attraverso tecniche di natura in-situ ed ex-situ, variando le condizioni di attivazione del precursore (CaCO3) e gli effetti del sintering sulla struttura finale della matrice porosa. Tecniche come la diffrazione ai raggi X e l’adsorbimento con N2 sono state impiegate per identificare correlazioni tra le proprietà micro-strutturali del sorbente e la rispettiva dimensione media delle cristalliti, andando a considerare campioni completamente calcinati di carbonato di calcio in vuoto e variando le condizioni di alta temperatura (800-900°C) durante la fase di riscaldamento. Con l’obiettivo di studiare quei particolari fenomeni che avvengono ad alta temperatura e che presentano una marcata dipendenza dal tempo, come la generazione della struttura porosa del sorbente, i processi di sintering e la chiusura dei pori in fase di carbonatazione, la tecnica di small angle X-ray scattering in-situ è stata per la prima volta applicata allo studio dell’evoluzione delle proprietà micro-strutturali del sorbente sia durante la fase di calcinazione, sia durante la carbonatazione del CaO. Inizialmente, test preliminari di natura ex-situ sono stati condotti all’Advanced Photon Source dell’Argonne National Laboratory per testare le capacità di analisi della tecnica di small angle scattering ai raggi X nel caratterizzare campioni ad elevata porosità, come quelli ottenuti dalla completa calcinazione del CaCO3 e quelli parzialmente carbonatati. Eccellenti risultati sono stati ottenuti da questi test, i quali hanno fornito una descrizione quantitativa estremamente dettagliata della micro-struttura dei sorbenti analizzati. Perciò, per la prima volta test di small angle scattering ai raggi X di natura in-situ sono stati effettuati per analizzare la generazione delle proprietà micro-texturali del sorbente durante la fase di calcinazione del CaCO3 e, successivamente, la loro evoluzione durante la fase di carbonatazione del CaO. Due principali set di esperimenti sono stati condotti: calcinazioni di CaCO3 al di sotto di 800°C in atmosfera di puro N2; calcinazioni di CaCO3 ad alta temperatura (800°C e 900°C) in presenza di CO2 (da un minimo di 1% fino ad un massimo di 50%) nell’ambiente di reazione. Successivamente, test di carbonatazione del CaO sono stati effettuati a 550°C e con 0.5% di CO2. A causa della natura non catalitica della reazione di carbonatazione del CaO, un nuovo modello basato sul random pore model è stato proposto al fine di rappresentare non solo la cinetica di reazione, ma anche l’evoluzione della micro-struttura del sorbente durante la carbonatazione. Infine, uno studio fluidodinamico computazionale su un’apparecchiatura per l’analisi termo gravimetrica è stato effettuato per poter quantificare gli effetti del mass transfer esterno sulla cinetica di carbonatazione del CaO.
Hsieh, Tien-Lin. "Applications of Chemical Looping Technologies to Coal Gasification for Chemical Productions". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1520269709048255.
Texto completoChung, Elena Yin-Yin. "Investigation of Chemical Looping Oxygen Carriers and Processes for Hydrocarbon Oxidation and Selective Alkane Oxidation to Chemicals". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469182957.
Texto completoFawzy, Mohamed Khaled Adel. "An experimental and modelling study of the capture of CO2 from gas mixtures with different techniques, with focus on multicomponent effects". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Buscar texto completoBITELLI, ULYSSES D. "Medida de parametros integrais no reator IPEN / MB-01". reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10876.
Texto completoMade available in DSpace on 2014-10-09T14:06:08Z (GMT). No. of bitstreams: 1 07181.pdf: 9427675 bytes, checksum: b63bf520f5e52b6456ed23681cc3e0dd (MD5)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Trompelt, Michael. "Untersuchung von Möglichkeiten zur Wirkungsgradsteigerung von braunkohlegefeuerten IGCC-Kraftwerken mit CO2-Abtrennung". Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2015. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-158214.
Texto completoTeng, Baiyang. "Porous Organic Polymers for CO2 Capture". Thesis, 2013. http://hdl.handle.net/10754/292819.
Texto completo"Design of Metal-Organic Frameworks for Carbon Capture Applications: Approaches for Adsorptive Separation of CO2/N2 and O2/N2 Mixtures". Master's thesis, 2019. http://hdl.handle.net/2286/R.I.53608.
Texto completoDissertation/Thesis
Masters Thesis Chemical Engineering 2019
Al, Rowaihi Israa. "Development of Electro-Microbial Carbon Capture and Conversion Systems". Diss., 2017. http://hdl.handle.net/10754/625040.
Texto completoGonçalves, Ana Carolina Spínola. "Capture and conversion studies of carbon dioxide into chemical products". Master's thesis, 2020. http://hdl.handle.net/10316/93857.
Texto completoA captura e armazenamento de carbono (CAC) e a captura e utilização de carbono (CCU) são consideradas internacionalmente como potencial medidas de mitigação para a redução de emissões atmosféricas de dióxido de carbono geradas em grandes fontes industriais. Este estudo incide sobre uma análise teórica das várias opções das tecnologias de CAC e CCU, e uma parte experimental sobre a carbonatação mineral utilizando um resíduo industrial alcalino, os grits, formados durante o processo Kraft na produção de pasta de papel. A parte experimental do estudo foi realizada no Centro de Investigação para os Processos Químicos e Produtos da Floresta (CIEPQPF) do Departamento de Engenharia Química da Universidade de Coimbra.Foi adotada a via de carbonatação mineral indireta composta por duas etapas: a etapa de extração de cálcio e a etapa de carbonatação originando um precipitado de carbonato de cálcio. Numa primeira abordagem foram analisados quatro possíveis solventes de extração (HNO3, CH3COOH, NaOH e o NH4Cl), de forma a determinar qual dos solventes teria um melhor desempenho na fase de extração de cálcio dos grits. De entre os quatro solventes apenas o HNO3 e o CH3COOH se destacaram com eficiências de remoção de 79,4 e 73,2 %, respetivamente, depois de 2 horas de operação a 30 oC. Testes cinéticos com os dois solventes demonstraram que inicialmente a cinética de dissolução do resíduo era muito rápida, estabilizando após 60 minutos. O HNO3 teve um melhor desempenho sobretudo nas eficiências registadas, contudo como é um ácido de natureza corrosiva e com custos associados elevados, optou-se pelo CH3COOH como solvente de extração de Ca dos grits. Um planeamento Box-Behnken com três fatores (temperatura, concentração da solução de CH3COOH e razão sólido/líquido, S/L(g/L)) com três níveis foi utilizado para determinar as condições ótimas da etapa de extração. A partir da análise estatística dos resultados, tendo como base o diagrama de Pareto, foi possível determinar quais os fatores que mais influenciam a extração de Ca. A concentração de ácido acético e a razão sólido-líquido foram os únicos fatores que demonstraram resultados com significância estatística, contribuindo positivamente e negativamente para a eficiência de extração de Ca, respetivamente. As análises baseadas na metodologia da superfície de resposta e função de “desirability” permitiram encontrar as condições ótimas: concentração de ácido de 2M, temperatura de 45ºC e razão sólido/líquido de 30g/L com uma eficiência de extração de cerca de 77 %.Na segunda etapa, foram realizadas experiências de carbonatação para a precipitação de carbonato de cálcio, fazendo reagir o licor rico em cálcio, obtido na etapa de extração sob condições ótimas, com uma corrente gasosa de CO2 num reator de pressão feito de inox. Essas experiências foram planeadas de acordo o projeto do tipo Box-Behnken com dois fatores (temperatura e pressão no interior do reator). A análise estatística dos resultados demonstrou que a única variável com significado estatístico era o efeito quadrático da temperatura, contribuindo negativamente para a eficiência de carbonatação. Deste modo, conclui-se que os intervalos de variação dos fatores selecionados não permitiram obter a variabilidade desejada para a eficiência de carbonatação. Contudo, foi possível obter condições ótimas de 30ºC e 30 bar, com eficiências de carbonatação na ordem dos 74 %, correspondendo uma capacidade de sequestro de CO2 de cerca de 460 kg CO2 /ton de grits.
The carbon capture and storage (CCS) and carbon capture and utilization (CCU) have been considered internationally as potential measures to reduce the atmospheric emissions of carbon dioxide by large industrial sources.This study focuses on a theoretical analysis of the several options given by the CCS and CCU, and experimental work of mineral carbonation using an alkaline industrial waste, the grits, formed during the Kraft process in the production of paper pulp. The experimental tests were carried out at Chemical Process Engineering and Forest Products Research Centre (CIPQPF), Department of Chemical Engineering of University of Coimbra. The route of the indirect mineral carbonation was adopted, composed by two steps: first the extraction of calcium from the grits and second the precipitation of calcium carbonate. In a first approach, four possible extraction solvents were analyzed (HNO3, CH3COOH, NaOH and NH4Cl) to determine which solvent exhibited the best performance of the extraction of Ca from the grits. Among them, only HNO3 and CH3COOH have shown significant results with extraction efficiencies of 79.4 and 73.2%, respectively, after 2 h at 30 oC. Kinetic tests conducted with the two solvents demonstrated that initially the rate of the extraction process of Ca was very fast, stabilizing after 60 minutes. Since the nitric acid is a corrosive acid and with high associated costs, the acetic acid was selected for dissolution of grits and extraction of calcium. A Box-Behnken design with three factors (temperature, concentration of CH3COOH solution and solid/liquid ratio) having three levels was used to determine the optimal conditions of the extraction step. From the Pareto chart, it was possible to conclude that the acetic acid concentration and the solid-liquid ratio were the factors that demonstrated results with a significant statistical level, contributing positively and negatively to the efficiency of Ca extraction, respectively. The analysis based on the response surface methodology and the desirability functions allowed to found the following optimal conditions: acetic acid concentration of 2M, solid/liquid ratio of 30 g/L and temperature of 45ºC with an efficiency approximately of 77%. In the second step, carbonation experiments for the precipitation of CaCO3 were performed contacting the Ca-rich liquor, obtained from the extraction step operated under optimal conditions, with a flux of pure CO2 gaseous in a stainless inox reactor. These experiments were planned according to a Box-Behnken design with two factors (temperature and the pressure inside the reactor) at three levels. The statistical analysis of the results demonstrated that the only variable with a significant statistical level was the quadratic effect of the temperature, contributing negatively to the carbonation efficiency. Therefore, the ranges of the levels selected for the 2 factors do not produced a desired variability in the carbonation efficiencies. However, the response surfaces and desirability functions led to optimal conditions of 30 ºC and 30 bar, reaching a carbonation efficiency of 74%, corresponding a CO2 sequestration capacity of 460 kg CO2/ton of grits.
Zafanelli, Lucas F. A. S. "Simulation of fixed bed and pressure swing adsorption processes for capture and separation of CO2/CH4/N2 mixtures". Master's thesis, 2018. http://hdl.handle.net/10198/19538.
Texto completoNowadays, several research and development efforts are devoted to find processes that can mitigate global warming. This phenomenon is caused by anthropogenic emissions of greenhouse gases, such as carbon dioxide and methane. In this way, adsorption processes are a promising alternative for capturing and separating greenhouse gases because it presents a lower energy cost, compared to other methods, and especially for the possibility of regenerating the adsorbent material without generating by-products. In addition, adsorption processes can be used for upgrading natural gas, a fuel with a low emission of carbon dioxide per kilowatt of energy produced. Thus, the main objective of this work was the development of an adsorption simulator to study the separation of CO2/CH4/N2 mixtures in a fixed bed including the conceptual design of a cyclic pressure swing adsorption (PSA) process for CO2 capture and purification. In order to achieve this objective, a mathematical model has been developed to describe the adsorption of mixtures in a fixed bed solved through numerical methods available in the literature. The numerical implementation was performed in MATLAB® simulation environment. The implemented model was tested and validated by simulating numerical examples of fixed bed adsorption available in the literature. Also, the model was used to fit experimental data collected at LSRE/CIMO-IPB concerning the CO2 adsorption in a fixed bed containing Activated Carbon derived from a municipal solid waste compost (AC-MSW). It was found, that the non-isothermal fixed bed adsorption model developed accurately described the experimental data. Finally, the thermodynamic and kinetic data collected from the best AC-MSW studied material was used to design a conceptual PSA unit using the numerical model and simulator developed. The conceptual PSA process was designed to capture carbon dioxide in a real post-combustion stream with data supplied by Persian Gulf Star Oil Company (PGSOC). Process performance parameters of the conceptual PSA simulated, indicate that is possible to achieve between 9.5-25% purity and high recovery of CO2 (above 87%) with the AC-MSW material, depending on the purge to feed ratio.
Atualmente, grandes esforços em pesquisa e desenvolvimento são destinados à busca de processos que possam mitigar o aquecimento global. Esse fenômeno é ocasionado por emissões antropogênicas de gases de efeito estufa, como o dióxido de carbono e o metano. Diante deste problema, o processo de adsorção é uma alternativa promissora para a captura e separação de gases do efeito estufa por apresentar menor custo energético, comparado a outros métodos, e especialmente, pela possibilidade de regenerar o material adsorvente sem gerar subprodutos. Além disso, a adsorção pode ser utilizada na purificação do gás natural, um combustível com baixa emissão de dióxido de carbono por kilowatt de energia produzida. Assim, o principal objetivo deste trabalho foi desenvolver um simulador do processo de adsorção para o estudo da separação de misturas CO2/CH4/N2 em leito fixo incluindo um projeto conceitual do processo cíclico de adsorção por oscilação de pressão (PSA) para captura e purificação de CO2. Para alcançar este objetivo, um modelo matemático que descreve a adsorção de misturas em leito fixo foi desenvolvido e resolvido aplicando-se métodos numéricos disponíveis na literatura. A implementação numérica foi realizada no ambiente de simulação MATLAB®. O modelo implementado foi testado e validado simulando exemplos numéricos disponíveis na literatura. Além disso, o modelo foi ajustado aos dados experimentais coletados no LSRE/CIMO-IPB sobre a adsorção de CO2 em leito fixo contendo Carbono Ativado derivado de compostos de resíduos sólidos urbanos (AC-MSW). Constatou-se que o modelo não isotérmico de adsorção em leito fixo descreveu com boa precisão os dados experimentais. Por fim, os dados termodinâmicos e cinéticos coletados do melhor material estudado de AC-MSW foram utilizados para projetar uma unidade conceitual PSA utilizando o modelo numérico desenvolvido. A unidade conceitual PSA foi projetado para capturar dióxido de carbono de um fluxo real de gases pós-combustão, com dados fornecidos pela empresa Persian Gulf Star Oil Company (PGSOC). Os parâmetros de desempenho do processo PSA simulado indicam que com o AC-MSW é possível obter uma pureza entre 9.5-25% e alta recuperação de CO2 (acima de 87%), dependendo da relação entre a purga e a alimentação.
Fricker, Kyle Jeffery. "Magnesium Hydroxide Sorbents for Combined Carbon Dioxide Capture and Storage in Energy Conversion Systems". Thesis, 2014. https://doi.org/10.7916/D81R6NTT.
Texto completoGao, Ming. "Novel Liquid-Like Nanoscale Hybrid Materials with Tunable Chemical and Physical Properties as Dual-Purpose Reactive Media for Combined Carbon Capture and Conversion". Thesis, 2018. https://doi.org/10.7916/D8BK2VDG.
Texto completoWang, Shuoxun. "A Study of Carbon Dioxide Capture and Catalytic Conversion to Methane using a Ruthenium, “Sodium Oxide” Dual Functional Material: Development, Performance and Characterizations". Thesis, 2018. https://doi.org/10.7916/D8K94QPK.
Texto completoArellano, Treviño Martha Alejandra. "A study of catalytic metals and alkaline metal oxides leading to the development of a stable Ru-doped Ni Dual Function Material for CO2 capture from flue gas and in-situ catalytic conversion to methane". Thesis, 2020. https://doi.org/10.7916/d8-q7r5-9314.
Texto completoYeh, Chen-Hao y 葉丞豪. "Theoertical Studies of Chemical Reactions on Various Nano Clusters (including pure metal and metal oxide clusters):I. Bond Scission of N2 Molecule on Ruthenium Nano Clusters (Ru19 and Ru79)II. CO Oxidation Reaction on Ni4(OH)3/hGO MaterialIII. Conversion Reactions of Ethanol and Acetaldehyde on (ZnO)12 Cluster". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/xgrrrd.
Texto completo國立臺灣師範大學
化學系
104
Using various nano clusters to catalyze different chemical reactions is one of the many important research issues in recent years. The N2 bond cleavage is the rate-limiting step in the synthesis of ammonia, and ruthenium is a catalyst well known for this reaction. Both of double-icosahedral Ru19 (DI-Ru19) and twinned truncated octahedral Ru79 (t-TO-Ru79) clusters have been investigated to catalyze the adsorption and dissociation of dinitrogen on the active valley-like (stepped) region in Ru19 and Ru79. On the DI-Ru19 cluster, our results show that the valley-like region of Ru19 cluster could dissociate N2 with the lowest reaction barrier 0.78 eV;which on the t-TO-Ru79 cluster, our results demonstrate that dissociating the N-N bond of a N2 molecule on the valley-like region of t-TO Ru79 cluster has a even much lower reaction barrier, 0.27 eV. By using electronic analysis, we found that the adsorbed N2 molecule is parallel to the close-packed Ru atoms on a valley-like active site in both of Ru19 and Ru79, causing much amount of charge transfer from the d orbital of Ru atoms to the 2π* orbital to produce this small barrier. Nickel hydroxide clusters and graphene oxide (GO) composites are novel nanomaterials in the application of electrochemical catalysts. In this work, we calculated the energy of Ni4 adsorbed on saturated hydroxyl graphene oxide (hGO), which formed a Ni4(OH)3 cluster on the hydroxyl graphene oxide (Ni4(OH)3/hGO) and released 4.47 eV. We subsequently studied the oxidation of CO on the Ni4(OH)3/hGO system via three mechanisms –Eley-Rideal (ER), Langmuir-Hinshelwood (LH) and carbonated mechanisms. Our results show that the activation energy for oxidation of the first CO molecule according to the ER mechanism is 0.14 eV, much smaller than that with LH (Ea = 0.65 eV), or with carbonated (Ea = 1.28 eV) mechanisms. The barrier of oxidation of the second CO molecule to CO2 with the ER mechanism increases to 0.43 eV, but still less than that via LH (Ea = 1.09 eV), indicating that CO could be effectively oxidized through the ER mechanism on the Ni4(OH)3/hGO catalyst. Zinc Oxide was an efficient catalyst for the aldol or Knoevenagel condensation reaction and could also be applied as the sensor for detecting ethanol. Here we have investigated the adsorption and C-C coupling reactions of ethanol and acetaldehyde on a (ZnO)12 cluster. First, with only two acetaldehyde molecules as reactants, the major product would be the 3-hydroxylbutanal formed by C-C coupling reaction via Zimmerman–Traxler model of aldol mechanism. Second, while with only two ethanol molecules, there is no product formed spontaneously, either acetaldehyde from ethanol dehydrogenation nor butanol by C-C coupling reaction of two ethanol molecules. Third, with coadsorption of one acetaldehyde and one ethanol molecules on (ZnO)12 cluster, the major product would be 2-buten-1-ol formed via C-C coupling reaction, in which the mechanism is similar to the aldol mechanism. These results demonstrate that the reactivity of C-C coupling reactions between ethanol and acetaldehyde on (ZnO)12 cluster depend on the concentration of acetaldehyde molecules.
(9820127), Shadia Moazzem. "Reduction of CO² emissions in coal-fired power plants for achieving a sustainable environment". Thesis, 2012. https://figshare.com/articles/thesis/Reduction_of_CO_emissions_in_coal-fired_power_plants_for_achieving_a_sustainable_environment/13460243.
Texto completoTrompelt, Michael. "Untersuchung von Möglichkeiten zur Wirkungsgradsteigerung von braunkohlegefeuerten IGCC-Kraftwerken mit CO2-Abtrennung". Doctoral thesis, 2013. https://tubaf.qucosa.de/id/qucosa%3A22956.
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