Дисертації з теми "Gas adsorption and selectivity"
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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.
Повний текст джерелаThe 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
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.
Повний текст джерелаKhaddour, Fadi. "Amélioration de la production de gaz des « Tight Gas Reservoirs »." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3005/document.
Повний текст джерелаThe 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
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.
Повний текст джерелаBattrum, M. J. "Gas separation by adsorption." Thesis, University of Bath, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376289.
Повний текст джерелаRöck, Frank. "System based selectivity improvements of gas sensor arrays." Aachen Shaker, 2009. http://d-nb.info/995246033/04.
Повний текст джерелаBecer, Metin Özkan Fehime S. "Gas adsorption in volumetric system/." [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000256.rar.
Повний текст джерелаZou, Jie. "Assessment of Gas Adsorption Capacity in Shale Gas Reservoirs." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75387.
Повний текст джерелаApolonatos, Georgia. "Gas adsorption with molecular sieve zeolites." Thesis, University of Ottawa (Canada), 1990. http://hdl.handle.net/10393/5907.
Повний текст джерелаHeslop, Mark J. "Binary gas adsorption in molecular sieves." Thesis, Loughborough University, 1993. https://dspace.lboro.ac.uk/2134/6861.
Повний текст джерелаWagner, Jeffrey A. "Gas adsorption on carbon nanohorn aggregates /." Available to subscribers only, 2008. http://proquest.umi.com/pqdweb?did=1594488041&sid=5&Fmt=2&clientId=1509&RQT=309&VName=PQD.
Повний текст джерелаTian, Jian Atwood J. L. "Molecular organic solids for gas adsorption and solid-gas interaction." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6882.
Повний текст джерелаRöck, Frank [Verfasser]. "System-Based Selectivity Improvements of Gas Sensor Arrays / Frank Röck." Aachen : Shaker, 2009. http://d-nb.info/1156518687/34.
Повний текст джерелаMohammad, Hasan Abid Urf Turabe Ali. "Ammonia gas adsorption on metal oxide nanoparticles." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/13094.
Повний текст джерелаDepartment of Mechanical and Nuclear Engineering
Steven J. Eckels
NanoActiveTM metal oxide particles have the ability to destructively adsorb organophosphorus compounds and chlorocarbons. These nanomaterials with unique surface morphologies are subjected to separate, low concentrations of gaseous ammonia in air. NanoActiveTM materials based on magnesium oxide have large specific surface areas and defective sites that enhance surface reactivity and consequently improved adsorptivity. In gas contaminant removal by adsorption, presence of vast specific surface area is essential for effective gas-solid interaction to take place. This is also the case in many industrial and chemical applications such as purification of gases, separation and recovery of gases, catalysis etc,. Typically carbonaceous compounds are utilized and engineered in toxic gas control systems. The purpose of this study was to compare NanoActiveTM materials with carbon based compounds in the effectivity of toxic gas adsorption at low concentrations. A test facility was designed to investigate the adsorption properties of novel materials such as adorption capacity and adsorption rate. Adsorption capacity along with adsorption kinetics is a function of properties of the adsorbent and the adsorbate as well as experimental conditions. Nanomaterials were placed on a silica matrix and tested with increasing flow rates. Electrochemical sensing devices were placed at inlet and outlet of the facility to monitor real time continuous concentration profiles. Breakthrough curves were obtained from the packed bed column experiments and saturation limits of adsorbents were measured. Adsorption rates were obtained from the breakthrough curves using modified Wheeler-Jonas equation. The NanoActiveTM materials adsorbed ammonia though to a lesser extent than the Norit® compounds. This study also included measurement of pressure drop in packed beds. This information is useful in estimating energy losses in packed bed reactors. Brauner Emmet Teller tests were carried out for the calculation of surface area, pore volume and pore size of materials. These calculations suggest surface area alone had no notable influence on adsorption capacity and adsorption rates. This lead to the conclusion that adsorption was insignificant cause of absence of functional groups with affinity towards ammonia. In brief, adsorption of ammonia is possible on NanoActiveTM materials. However functional groups such as oxy-flouro compounds should be doped with novel materials to enhance the surface interactions.
Newby, Ruth. "Gas adsorption studies in metal-organic frameworks." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32287/.
Повний текст джерелаXiong, Fengyang. "Desorption and Adsorption of Subsurface Shale Gas." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1591975402482308.
Повний текст джерелаTsige, Seyoum. "Kinetic Selectivity Effects of Binary Mixtures on Nanotube Bundles: Internal and External Adsorption." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/220.
Повний текст джерелаNavaei, Milad. "Quartz crystal microbalance adsorption apparatus for high pressure gas adsorption measurements in nanomaterials." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41057.
Повний текст джерелаDiao, Rui. "Fundamental Study of Simple Gas Adsorption and Adsorption-Induced Deformation in Carbonaceous Materials." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/56504.
Повний текст джерелаMersie, Wondimagegnehu. "Selectivity and soil behavior of chlorsulfuron." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53563.
Повний текст джерелаPh. D.
Bur, Christian. "Selectivity Enhancement of Gas Sensitive Field Effect Transistors by Dynamic Operation." Doctoral thesis, Linköpings universitet, Tillämpad sensorvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-114670.
Повний текст джерелаGaskänsliga fält-effekt-transistorer baserade på halvledarmaterialet kiselkarbid (SiC-FET) har redan framgångsrikt använts för olika tillämpningar främst inom området för avgas- och förbränningsövervakning. Normalt har dessa sensorer använts vid konstant temperatur och anpassning till specifika tillämpningar har gjorts av material och sensor optimering. I denna avhandling har metoden för dynamisk modulering systematiskt utvecklats för att ökaselektiviteten av SiC-FETs. Temperatur-cykling är en välkänd metod för metalloxidsensorer och har nu tillämpats på SiC-FETs för första gången. Likaså har den pålagda gatepotentialen varierats. Mönsterigenkänningsmetoder baserade på multivariat statistik används för att utvärdera multi-dimensionella sensordata. Olika strategier för urval, korsvalidering och klassificering av okända uppgifter studeras. Efter att metodiken för dynamiska mätmetoder har beskrivits i detalj, verifieras strategin av virtuella-multisensorer genom två tester under laboratorieförhållanden. Detta visas av exemplet med separering av typiska avgaser och bestämning av koncentrationen av kväveoxider i varierande gasblandningar. Vidare har ett test genomförts där flyktiga organiska föreningar identifieras och kvantifieras för att bestämma kvaliteten på inomhusluft. Dessutom kan man öka selektiviteten av sensorerna genom att kombinera modulering av temperatur och gate-potential.
Gassensitive Feldeffekt-Transistoren basierend auf Siliziumkarbid (SiC-FET) werden überwiegend für die Abgasmessung eingesetzt. Üblicherweise werden diese Sensoren bei konstanter Temperatur betrieben. Durch die Auswahl geeigneter Materialien sowie durch die Modifikation der Sensoren können diese für verschiedene Anwendungen optimiert werden. In der vorliegenden Dissertation wird die Methodik einer dynamischen Betriebsweise zur Selektivitätssteigerung systematisch weiterentwickelt. Temperaturmodulation ist ein bewährtes Verfahren für Halbleitergassensoren, das hier auf SiC-FETs übertragen wird. In ähnlicher Weise wird auch das Gate-Potential zyklisch variiert. Mustererkennungsverfahren basierend auf multivariater Statistik werden eingesetzt, um die mehrdimensionalen Messdaten auszuwerten. Verschiedene Verfahren zur Merkmalsauswahl, Kreuzvalidierung und Klassifikation unbekannter Daten werden untersucht. Nachdem die Methodik ausführlich dargelegt wurde, wird der Ansatz des virtuellen Multisensors anhand zweier Anwendungen unter Laborbedingungen verifiziert. Dies wird am Beispiel der Konzentrationsbestimmung von Stickoxiden in variierenden Gasgemischen gezeigt. Zudem werden flüchtige organische Verbindungen im niedrigen ppb-Bereich zur Bestimmung der Innenraumluftqualität erkannt und quantifiziert. Die Selektivität kann durch die Kombination von Temperatur- und Potentialmodulation weiter gesteigert und Drifteinflüsse durch erweitertes Training kompensiert werden.
Lang, Mason J. "CATALYTIC WASTE GASIFICATION: WATER-GAS SHIFT & SELECTIVITY OFOXIDATION FOR POLYETHYLENE." Cleveland State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=csu1560982761165342.
Повний текст джерелаHart, J. "Separation of gases by adsorption." Thesis, University of Bath, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234617.
Повний текст джерелаRees, G. J. "Interfacial adsorption in a gas-liquid chromatographic system." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.638636.
Повний текст джерелаMutasim, Z. Z. "Separation of gas mixtures by pressure swing adsorption." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379811.
Повний текст джерелаArmstrong, Jayne. "Gas adsorption and separation properties of porous material." Thesis, University of Newcastle upon Tyne, 2013. http://hdl.handle.net/10443/2119.
Повний текст джерелаMa, Shengqian. "Gas Adsorption Applications of Porous Metal-Organic Frameworks." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1209411394.
Повний текст джерелаRauch, William L. "A high selectivity gas sensor based on a semi-permeable zeolite membrane." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20151.
Повний текст джерелаZone, Ian Robert. "Dynamics and control of a pressure swing adsorption process." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/762/.
Повний текст джерелаJordi, Robin Guy. "Batch frequency response techniques in gas phase adsorption applications /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16290.pdf.
Повний текст джерелаBestfather, Chris. "Upgrading landfill gas to natural gas quality: Bulk separation by pressure swing adsorption." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28403.
Повний текст джерелаSavage, Mathew. "Gas adsorption and binding properties of metal organic frameworks." Thesis, University of Nottingham, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716474.
Повний текст джерелаHuang, Liangliang. "Computational Study of Toxic Gas Removal by Reactive Adsorption." Thesis, North Carolina State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3538542.
Повний текст джерелаGrowing concerns about the environment and terrorist attacks prompt a search for effective adsorbents for removal of small molecule toxic gases, such as ammonia and hydrogen sulfide, under ambient conditions in the presence of moisture, where physical adsorption is not adequate. We use graphene oxide and CuBTC metal-organic framework as the adsorbents to explore toxic gas removal by reactive adsorption. Using ab initio density functional theory, atomistic reactive molecular dynamics and Monte Carlo simulation strategies, theoretical understanding of the underlying reaction and adsorption mechanisms of ammonia and hydrogen sulfide on graphene oxide and CuBTC metal-organic framework have been gained.
The ab initio calculation results show that ammonia and hydrogen sulfide decompose on carboxyl and epoxy functional groups and vacancy defects of graphene oxide. The existence of water molecules substantially reduces the adsorption/dissociation of ammonia or hydrogen sulfide on graphene oxide because the water molecules either form hydrogen bonds with the functional groups or adsorb more easily on the vacancy defects. Reactive molecular dynamics calculations by the ReaxFF method have been performed to propose realistic graphene oxide models for theoretical calculations. We also use reactive molecular dynamics simulation to study the thermal and hydrostatic stabilities of the CuBTC metal-organic framework and its application for ammonia removal. We predict the collapse temperature for CuBTC crystal structure and observe the partial collapse of CuBTC at lower temperatures upon ammonia adsorption. The results agree well with experiment data and provide insights on the reaction mechanism involved in such an ammonia removal process.
The research in this thesis can provide fundamental understanding, at the electronic and atomistic levels, of the roles of surface defects and functionalities for reactive adsorption of toxic gas molecules. In addition to developing experimental and theoretical algorithms to design effective adsorbents, the results are expected to find applications in air cleaning, energy storage, fuel cell technology and other scientific challenges where the separation of reactive molecules is involved.
Mangel, Astrid. "Gas adsorption and neutron scattering studies of chromatographic supports." Thesis, University of Exeter, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239391.
Повний текст джерелаChihara, Kazuyuki, Yosuke Kaneko, Takuya Terakado, and Hisashi Mizuochi. "Diffusion in multicomponent gas adsorption on MSC5A, chromatographic study." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-194787.
Повний текст джерелаValente, Inês Alexandra Manata Antunes. "Adsorption equilibria of flue gas components on activated carbon." Master's thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/12168.
Повний текст джерелаChihara, Kazuyuki, Yosuke Kaneko, Takuya Terakado, and Hisashi Mizuochi. "Diffusion in multicomponent gas adsorption on MSC5A, chromatographic study." Diffusion fundamentals 3 (2015) 16, S. 1-4, 2005. https://ul.qucosa.de/id/qucosa%3A14304.
Повний текст джерелаCANTI, LORENZO. "Theoretical modeling of gas adsorption in microporous aromatic polymers." Doctoral thesis, Università del Piemonte Orientale, 2016. http://hdl.handle.net/11579/81935.
Повний текст джерелаChihara, Kazuyuki, Hidenori Nakamura, and Yosuke Kaneko. "Diffusion study of multi-component gas adsorption in MSC5A by chromatographic method: Diffusion study of multi-component gas adsorption in MSC5Aby chromatographic method." Diffusion fundamentals 6 (2007) 57, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A14236.
Повний текст джерелаBur, Christian [Verfasser]. "Selectivity Enhancement of Gas Sensitive Field Effect Transistors by Dynamic Operation / Christian Bur." Aachen : Shaker, 2015. http://d-nb.info/1075437172/34.
Повний текст джерелаLiow, Daniel Ann Keng. "The modelling of diffusion controlled Pressure Wing Adsorption." Thesis, University of Surrey, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332279.
Повний текст джерелаKarra, Jagadeswarareddy. "Development of porous metal-organic frameworks for gas adsorption applications." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45751.
Повний текст джерелаKrause, Simon [Verfasser]. "Negative Gas Adsorption of Flexible Metal-Organic Frameworks / Simon Krause." München : Verlag Dr. Hut, 2019. http://d-nb.info/1219178330/34.
Повний текст джерелаChen, Linjiang. "Molecular simulations studies of gas adsorption in metal-organic frameworks." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/9366.
Повний текст джерелаHunt, Joseph Ray. "Synthesis, characterization, and gas adsorption properties of covalent organic frameworks." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1779835631&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
Повний текст джерелаParaskeva, Themis C. "Improving the performance of gas sensors for electronic noses using zeolites as selectivity modifiers." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1445773/.
Повний текст джерелаJones, Isabel Zoe. "A surface science study of automobile exhaust gas reactions on palladium." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298639.
Повний текст джерелаCornelius, Chris James. "Physical and Gas Permeation Properties of a Series of Novel Hybrid Inorganic-Organic Composites Based on a Synthesized Fluorinated Polyimide." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28230.
Повний текст джерелаPh. D.
Sangster, J. A. "Adsorption and electrosorption studies with activated charcoal cloth." Thesis, Liverpool John Moores University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233600.
Повний текст джерелаUner, Murat. "Adsorption Calorimetry In Supported Catalyst Characterization: Adsorption Structure Sensitivity On Pt/y-al2o3." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605511/index.pdf.
Повний текст джерелаthe particle size of the catalysts was manipulated by calcining at different temperatures. The dispersion values for the catalysts calcined in air at 683K, 773K and 823K were measured as 0.62, 0.20 and 0.03 respectively. The differential heats of adsorption of hydrogen, carbon monoxide and oxygen were measured using a SETARAM C80 Tian-Calvet calorimeter. No structure dependency was observed for hydrogen, carbon monoxide or oxygen initial heats of adsorption. The adsorbate:metal stoichiometries at saturation systematically decreased with increasing particle size. Hydrogen chemisorption sites with low and intermediate heats were lost when the particle size increased. On the other hand, oxygen and carbon monoxide initial heats and adsorption site energy distributions did not change appreciably with the metal particle size.