Teses / dissertações sobre o tema "Catalyc performance"
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Rua, Gonzalez Diego. "Synthèse de matériaux catalytiques de type oxydes mixtes pour la production de méthanol par la précipitation en flux continu en système microfluidique". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF001.
Texto completo da fonteGlobal warming is a concern for the current and future generations due to the increasing greenhouse gases (GHG) emissions to the atmosphere, mainly due to the dependence on fossil fuels. The use of alternative fuels such as sustainable methanol produced from renewable H2 and from CO2 would contribute to reduce the GHG emissions and the effects of climate change. The synthesis of methanol using CO2 rich feedstock is preferentially done by using a solid catalyst composed of CuO, ZnO and ZrO2. This type of catalyst can be produced by coprecipitation of the metal species using a microfluidic device, with advantages that have been demonstrated over catalysts synthesized by batch coprecipitation. In this work, different catalysts for the hydrogenation of CO2 to methanol were synthesized using the microfluidic technique under different conditions, in order to explore different synthesis parameters that could lead to the development of more active catalysts. The differences in the properties and activity between a catalyst synthesized by the microfluidic method and another synthesized by the batch method were investigated, followed by an exploration of the effects of the aging time and the coprecipitation temperature on the catalysts. Lastly, the effect of different compositions of catalysts on the properties and activity were determined, by investigating different CuO contents, the use of CeO2 as a catalyst promoter, and the use of In2O3 as a catalyst promoter and as active metal
Deshpande, Nitish. "Catalytic Material Design: Design Factors Affecting Catalyst Performance for Biomass and FineChemical Applications". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu154273906480973.
Texto completo da fonteTangale, N. P. "Zeolite based micro-mesoporous composites: synthesis, characterization and catalytic performance as heterogeneous catalyst for valorization of sugar". Thesis(Ph.D.), CSIR- National Chemical Laboratory, Pune, 2018. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4576.
Texto completo da fonteHaimad, N. "A theoretical and experimental investigation of the flow performance of automotive catalytic converters". Thesis, Coventry University, 1997. http://curve.coventry.ac.uk/open/items/3f51aa95-571c-73d5-bee3-4b523cab0a1c/1.
Texto completo da fonteInayat, Amer [Verfasser], e Wilhelm [Akademischer Betreuer] Schwieger. "Open-cell Foams as Catalyst Support: A Description of Morphology, Fluid Dynamics and Catalytic Performance / Amer Inayat. Gutachter: Wilhelm Schwieger". Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2014. http://d-nb.info/1054342253/34.
Texto completo da fonteLin, ChienShung. "Effect of wall thermal conductivity on the performance of Swiss roll combustors using ammonia pretreated Pt catalyst for catalytic reaction". Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Spring2009/C_Lin_040609.pdf.
Texto completo da fonteTitle from PDF title page (viewed on May 27, 2009). "School of Mechanical and Material Engineering." Includes bibliographical references (p. 45-47).
Lakshmanan, Alagendran. "RFID : a catalyst for supply chain performance". Thesis, Jönköping University, JIBS, Centre of Logistics and Supply Chain Management, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-8068.
Texto completo da fonteTHE ADVANTAGE OF RFID TECHNOLOGY IMPLEMENTATION IN A MANUFACTURING FIRM. THE TECHNOLOGY IMPLEMENTATION STREAM LINES THE LOSS OF INFORMATION FLOW WHEN THE PRODUCT MOVES ALONG THE DIFFERENT CHAIN MEMBERS. THE COMMON SHARING OF THE ASSOCIATED BENEFIT BRINGS HIGHER PROCESS EFFICEINCY , WHEN THE PRODUCT MOVES ALONG THE UPSTREAM AND DOWNSTREAM SUPPLY CHAIN FOR THE SELECTED PRODUCT. THE IMPLEMENTATION IS A CUSTOMISED SOLUTION FOR THE MANUFACTURING UNIT FOR ITS PRODUCT, THIS THESIS WILL ENABLE THE IMPLEMENTATORS THE VALUABLE IMPLEMENTATION PROCEDURES THAT ONE HAS TO FOLLOW TO TAKE RIGHT BENEFIT FROM THIS TECHNOLOGY.
Todd, Heather Elizabeth. "Investigating catalyst performance in batch reactive distillation". Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1244.
Texto completo da fonteZhan, Xiaotong. "Heterogeneous catalysis in microreactors : study of the performance of various supports". Thesis, Ecole centrale de Marseille, 2018. http://www.theses.fr/2018ECDM0007/document.
Texto completo da fonteThis study presents the preparation and the evaluation of performance of a new monolithic catalyst in microreactor. The transfer hydrogenation of p-nitrophenol by formic acid is chosen as the model reaction for the comparison of the monolith with a traditional packed-bed microreactor containing commercial catalyst.This thesis includes an important experimental part. On the one hand, experimental set-up and protocols involving on-line analysis have been developed in order to study quantitatively the model reaction; On the other hand, the conditions of preparation of functionalized silica monolith in a stainless steel tube with the inner wall pre-coated by glass were optimized, and the palladium nanoparticles were immobilized by a continuous flow method. The monolith possesses the flow-through macropores, typical hexagonal organization of mesopores and micropores, and scarcely any shrinkage. The comparison of the two types of catalysts mainly focuses on the activity of catalysts in the model reaction, their kinetic model and their dynamic behavior in the start-up phase of the flow microreactor. In the theoretical part, the modelisation of reactor has been investigated both under stationary conditions for kinetics determination and under transient conditions for the rationalization of experimental observations. Pd@silica monolith and commercial Pd@alumina powder have different behavior and gives different kinetic laws. A reaction model with change in the catalytic surface properties could explain the unusual profile of concentrations observed with commercial catalyst. The superior performance of monolithic catalyst is demonstrated, which also exhibits particular industrial interests
Afshar, Farniya Ali. "Development and performance analysis of autonomous catalytic micropumps". Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/284892.
Texto completo da fonteOne of the main challenges in the engineering of nanomachines, besides the difficulties to fabricate complex nanometric objects, is how to power them. The application of external fields is a common and easy way to actuate relatively large machines. However, when the size of the machines becomes smaller, the transfer of power from the macroscopic scale to the nanoscale becomes problematic. Therefore, the development of fully autonomous nanoscale systems which can self-generate their required power is very desirable. Biological systems are the source of numerous examples of natural micro/nanoscale autonomous motors. The conversion of chemical energy into directional motion is the key point behind the high efficient nanofactory of biomolecular machines. Therefore there is a high interest to create novel artificial machines which can self-propel and perform autonomous activities in a similar way the impressive molecular machinery does in living organisms. Many research activities have recently focused on chemically powered motors and micropumps based on the local self-generation of gradients. The present research work deals with the catalytic micropump concept which was reported for the first time in 2005. A catalytic micropump is an active system which has the capability of triggering electrohydrodynamic phenomena due to an (electro)chemical reaction taken place on a micro/nano bimetallic structure. Although catalytic devices have been the subject of previous reports in which their nanotechnological applications have started to be demonstrated, the mechanism of the chemo-mechanical actuation has been less studied. That is in part due to the complex interrelation between the catalytic reactions and the electro-hydrodynamic phenomena. As a consequence there is still a number of intriguing questions that require further investigation for establishing the role played by the different processes and for achieving a better understanding of the mechanism behind them. Therefore, the research was focused on the full characterization of the chemomechanical actuation and the understanding of the main physicochemical factors governing the operating mechanism of Au-Pt bimetallic micropumps in presence of hydrogen peroxide fuel. The investigations were supported not only by experimental findings but also by numerical simulations. These fundamental studies are of high importance not only for catalytic micropumps but also for other autonomous micro/nano swimmers or active self-propelled colloids. The studies were also extended to other bimetallic structures (Au-Ag, Au-Ru, Au-Rh, Cu-Ag, Cu-Ni, Ni-Ru and Ni-Ag) and to semiconductor/metallic structures (p-doped Si/Pt, n-doped Si/Pt) to evaluate their potentialities as catalytic micropumps in presence of the same chemical fuel. In the last case photoactivation of the catalytic reactions can be accomplished which provides an added value to these pumps as novel photochemical-electrohydrodynamic switches. These achievements can open new and promising research activities in the field of catalytic actuators and nanomotors. The thesis work also describes one of the potential applications of these active devices which is related to the autonomous material guiding and self-assembly on particular locations of a sample. That allows fabricating nanostructured surfaces in an autonomous way with potential nanotechnological impact in a wide range of fields.
Chawla, Neha. "The Catalytic Performance of Lithium Oxygen Battery Cathodes". FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3810.
Texto completo da fonteKeuler, Johan Nico. "Optimising catalyst and membrane performance and performing a fundamental analysis on the dehydrogenation of ethanol and 2-butanol in a catalytic membrane reactor". Thesis, Link to the online version, 2000. http://hdl.handle.net/10019.1/1277.
Texto completo da fonteJacobs, Clayton Jeffrey. "Influence of catalyst ink mixing procedures on catalyst layer properties and in-situ PEMFC performance". Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22932.
Texto completo da fonteGómez, Sanz Sara. "Exploiting carbon in enhancing the performance of catalytic materials". Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708360.
Texto completo da fonteBerger, Christine, Rainer A. Rakoczy, Roger Gläser e Jens Weitkamp. "Synthesis and catalytic performance of large zeolite Y crystals". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-196408.
Texto completo da fonteBerger, Christine, Rainer A. Rakoczy, Roger Gläser e Jens Weitkamp. "Synthesis and catalytic performance of large zeolite Y crystals". Diffusion fundamentals 2 (2005) 82, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14418.
Texto completo da fonteGomes, Flores Camila. "Synthesis and catalytic performance of metal-zeolite composite catalysts". Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R010/document.
Texto completo da fonteZeolites are microporous crystalline solids with a regular pore system, which have found numerous applications in industrial processes such as oil refining, organic synthesis, adsorption and separation. Very small pore size of zeolites (~1 nm) imposes diffusional limitations for many catalytic reactions. The catalytic performance of metal zeolite bifunctional catalysts can be improved by creating hierarchical zeolites and by controlling localization of metal species within the zeolite crystals. Impregnation is an efficient method for the preparation of bi-functional cobalt-zeolite catalysts for the direct production of liquid fuels from syngas. In the catalysts prepared via impregnation, cobalt occupies the cation exchange positions in the zeolite micropores decreasing the number of acid sites available for hydrocarbon isomerization and cracking. Isolation of cobalt ions in cationic positions reduces catalyst reducibility, makes it difficult to achieve metallic state and decreases the amount available metal active sites for Fischer Tropsch synthesis. We found that the presence of Na+ instead of H+ ions in the exchange positions of the large pore Beta zeolite favored deposition of cobalt on the external surface of the zeolite, while the acid sites in the zeolite micropores were not much affected. The large pore cobalt Beta zeolite catalyst with cobalt species localized on the external surface and high concentration of acid sites in the zeolite crystals has showed enhanced catalytic performance in Fischer-Tropsch synthesis combined with hydrocarbon isomerization. Another approach of this thesis has addressed creating hierarchical zeolites with several levels of meso- and microporosity using sacrificial templates. Hierarchical zeolites synthesized using cobalt containing carbon nanotubes, as sacrificial hard templates exhibited higher catalytic activity, lower methane selectivity and higher selectivity to isomerized hydrocarbons in Fischer-Tropsch synthesis. The synthesis strategy based on metal carbon nanotubes as sacrificial templates has been extended to other metals such as nickel and magnesium. This new approach to the synthesis of metal-zeolite composite increases the mesoporosity and improves the catalytic performance in hydrogenation of aromatics and anisole acylation
Medina, Molano Natalia Stefania. "Contribution of radioactivity to catalytic performance in heterogeneous media". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR025.
Texto completo da fonteThis thesis aimed to identify applications of noble metals recovered from spent nuclear fuels such as 107Pd. To study the effect of the radiation three different applications were selected: heterogeneous catalysis, with the hydrogenation of cinnamaldehyde (CNA) as model reaction; photocatalysis, with the decolourisation of methyl orange (MO) as model reaction; and the regeneration of catalysts, deactivated with the synthesis of hydroxymethyl furfural. Protocols were developed for the synthesis of the catalysts and the performance testing in restricted nuclear environment, namely in glove box and for the implementation of the reactions in glove box and extractor column as appropriate.Regarding the results it was found that β-radiation did not show any effect on the hydrogenation of CNA independent of the applied reaction conditions. On the other hand, the decolourisation of MO was successfully activated by the β-radiation of the catalyst. A decrease in absorbance (at the isosbestic point) was observed and was correlated to the amount of the catalyst employed, evidencing the effect of the irradiation doses. Finally, the regeneration of the Pd-based catalyst showed promising results after γ-irradiation, notably with a partial recovery of the initial catalytic performance after -irradiation. Meanwhile, the Ru-based catalyst, although generally not performing well, showed increased activity compared to the fresh catalyst upon -irradiation
Gomes, Flores Camila. "Synthesis and catalytic performance of metal-zeolite composite catalysts". Electronic Thesis or Diss., Université de Lille (2018-2021), 2019. http://www.theses.fr/2019LILUR010.
Texto completo da fonteZeolites are microporous crystalline solids with a regular pore system, which have found numerous applications in industrial processes such as oil refining, organic synthesis, adsorption and separation. Very small pore size of zeolites (~1 nm) imposes diffusional limitations for many catalytic reactions. The catalytic performance of metal zeolite bifunctional catalysts can be improved by creating hierarchical zeolites and by controlling localization of metal species within the zeolite crystals. Impregnation is an efficient method for the preparation of bi-functional cobalt-zeolite catalysts for the direct production of liquid fuels from syngas. In the catalysts prepared via impregnation, cobalt occupies the cation exchange positions in the zeolite micropores decreasing the number of acid sites available for hydrocarbon isomerization and cracking. Isolation of cobalt ions in cationic positions reduces catalyst reducibility, makes it difficult to achieve metallic state and decreases the amount available metal active sites for Fischer Tropsch synthesis. We found that the presence of Na+ instead of H+ ions in the exchange positions of the large pore Beta zeolite favored deposition of cobalt on the external surface of the zeolite, while the acid sites in the zeolite micropores were not much affected. The large pore cobalt Beta zeolite catalyst with cobalt species localized on the external surface and high concentration of acid sites in the zeolite crystals has showed enhanced catalytic performance in Fischer-Tropsch synthesis combined with hydrocarbon isomerization. Another approach of this thesis has addressed creating hierarchical zeolites with several levels of meso- and microporosity using sacrificial templates. Hierarchical zeolites synthesized using cobalt containing carbon nanotubes, as sacrificial hard templates exhibited higher catalytic activity, lower methane selectivity and higher selectivity to isomerized hydrocarbons in Fischer-Tropsch synthesis. The synthesis strategy based on metal carbon nanotubes as sacrificial templates has been extended to other metals such as nickel and magnesium. This new approach to the synthesis of metal-zeolite composite increases the mesoporosity and improves the catalytic performance in hydrogenation of aromatics and anisole acylation
Paula, Fernanda Lobato de. "Perfil empreendedor e performance no âmbito de microempreendedores individuais: um estudo em Catalão (GO)". Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/6909.
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Over the years, research on entrepreneurship has grown significantly and has been the object of a multidisciplinary study of several areas with different interpretations. This dissertation approaches the theme in the context of individual microentrepreneurs and aims to establish the interconnections between the Catalão's individual micro entrepreneurs and the business' performance's characteristics, using as reference an evaluating proposed scale which was adapted and validated for this context. Such studying problem started from a gap of research identified in the literature which refers to topics linked to entrepreneurship and to the individual micro entrepreneurs (MEI).So it was developed an instrument adapted from the realization of the focal group's achievement with the opinions of specialists in entrepreneurship, MEI and the experience of a pre test done through a probable sample with the target public, instrument for this research. In order to indentify the effort of the MEI, it was based on the Sebrae´sdatas and also based on the websites Portal do Empreendedor, Tribunal Eleitoral de Goiás e Receita federal. It was done the Factorial Exploiter Analysis through the SPSS Statistics Program version 23.0 (Statistical Package for the Social Science in order to validate statistically the action proposed in this essay. Once the structured database was properly owned, describing analysis were made to characterization of the type of the sample and nonparametric tests (Mann Whitney and Kruskal-Wallis) to match the entrepreneurs characteristics profile with the variables of performance. IT was used the Correlation of Speaman to accomplish the main goal of this research. However, it can be conclude that the sample is composed mostly of women, with a mean age of 46,66 years with a high school diploma and a mean of 0.62 courses per year. The currentis the only activity they carry out and most are located in the commerce sector. In the Mann Whitney and Kruskal Wallis tests, it was found that men presented a higher score in FACTOR 3 (Need of realization) and higher average turnover in the analyzed period. In Spearman's correlation, it was found that there is a significant and positive interconnection between FACTOR 1(Planning) and average turnover, and that entrepreneurial characteristics and business performance are stronger in women.
Ao longo dos anos, as pesquisas sobre o tema empreendedorismo cresceram significativamente e tem sido objeto de estudo multidisciplinar de diversas áreas com diversas interpretações. Essa dissertação aborda o tema no contexto dos microempreendedores individuais e tem como objetivo estabelecer correlações entre as características empreendedoras dos microempreendedores individuais de Catalão (GO) e a performance dos negócios, tendo como referência uma escala avaliativa proposta e adaptada para este contexto. O problema de estudo surgiu a partir de uma lacuna na literatura que trata de temas vinculados ao empreendedorismo e aos microempreendedores individuais. Dessa forma, foi estruturado um instrumento de pesquisa adaptado a partir da realização do grupo focal com a opinião de especialistas em empreendedorismo e de microempreendedores individuais e a experiência de um pré-teste realizado através de amostra probabilística com o público alvo objeto desta pesquisa. Para identificar o desempenho dos negócios dos microempreendedores individuais, buscou-se a base de dados de atendimento do Sebrae/GO e dos sites do Portal do Empreendedor, Tribunal Eleitoral de Goiás e Receita federal. Para validar estatisticamente a medida proposta nessa dissertação, foi realizada uma Análise Fatorial Exploratória através do Programa SPSS Statistics versão 23.0 (Statistical Package for the Social Science). De posse da base de dados estruturada, foram realizadas análises descritivas para caracterização do perfil da amostra e testes não paramétricos (Mann Whitney e Kruskal- Wallis) para relacionar as variáveis de perfil com as características empreendedoras e as variáveis de performance. Para cumprir o objetivo principal da pesquisa, fezse uso da Correlação de Spearman. Contudo, pode-se concluir que a amostra é composta em sua maioria por mulheres, com idade média igual a 46,66 anos, com segundo grau completo e com a realização média de 0,62 cursos por ano. O negócio atual é a única atividade que exercem e a maioria se situa no setor de comércio.Nos testes Mann Whitney e Kruskal Wallis constatou-se que os homens apresentaram maior score no FATOR 3 (Necessidade de realização) e maior faturamento médio no período analisado. Na correlação de Spearman constatou-se que existe uma correlação significativa e positiva entre o FATOR 1(Planejamento) e faturamento médio e que as características empreendedoras e a performance do negócio são mais fortes nas mulheres.
Yilmaz, P. "Photoelectrochemical performance of catalyst systems based on Pd deposited TiO2 and Ag incorporated BiFeO3". Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/18403.
Texto completo da fontePeluso, Enzo. "Eggshell catalyst for hydrocarbon synthesis, kinetic modeling and reactor performance". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0033/MQ30754.pdf.
Texto completo da fonteMahali, Alude. "Piercing together a girlhood : (re)visiting memories of site using nostalgia as a catalyst for coping with atopia". Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/8256.
Texto completo da fonteIncludes bibliographical references (leaves 60-63).
My research has been preoccupied with the playing of memory with reference to narratives of loss. This loss has been represented by a loss of language, place and family, resulting in the playing of unnerving memory fragments. The primary driving force of this loss has been the notion of a disrupted or uprooted childhood. The subject of this enquiry is black girlhood; in particular, the relationships between black girls/women. Consequently a large part of 'piecing together a girlhood' involves engaging with what Quashie (2004) calls the 'girlfriend aesthetic'. Quashie's 'girlfriend aesthetic' offers a methodology for re-membering by providing a reflective surface; you see in the experience of the girlfriend other something that triggers or incites your own memory that aids you in working towards completion of self. This explication traces my interest in this subject matter as a direct result of feeling that black girlhood as a topic is under-represented, explores my development of a viable creative methodology for this kind of work, interrogates the meaning of 'site' in this context, maps out the origin of nostalgia and how it affects the afficted in relation to lost 'site', unpacks the girlfriend aesthetic as a practice and reveals how the nostalgic searcher's obsession with the irrecoverability of the past manifests in corporeal ways. Whether or not completion of self is possible, what is discovered is theatre's ability to aid in coping with a feeling of placelessness or atopia. Although nostalgia may indicate a fixation with the past, it can be a valuable and restorative way of emancipating oneself from it.
Bayraktar, Oguz. "Effect of pretreatment on the performance of metal contaminated commercial FCC catalyst". Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2071.
Texto completo da fonteTitle from document title page. Document formatted into pages; contains xvi, 214 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 199-208).
Navarro-Fernandez, Oscar. "Synthesis, Activation and Catalytic Activity of N-Heterocyclic Carbene Bearing Palladium Catalysts". ScholarWorks@UNO, 2006. http://scholarworks.uno.edu/td/330.
Texto completo da fonteGarcia, Amaya Arias. "Investigation of the flow performance of automative close coupled catalyst on flow rigs and engines". Thesis, Coventry University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247185.
Texto completo da fonteZhang, Changlin. "RATIONAL DESIGN OF ELECTROCATALYSTS WITH ENHANCED CATALYTIC PERFORMANCE IN ENERGY CONVERSION". University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478274856161346.
Texto completo da fonteKruger, Dawid. "Gas phase heterogeneous catalyst performance testing in laboratory fixed-bed reactors". Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31115.
Texto completo da fontePathirathna, Kuruppulage Asela Buddhika. "Gas turbine thermodynamic and performance analysis methods using available catalog data". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-17482.
Texto completo da fonteHibino, Takashi, Mitsuru Sano, Masahiro Nagao e Pilwon Heo. "A High-Performance Mo2C-ZrO2 Anode Catalyst for Intermediate-Temperature Fuel Cells". The Electrochemical Society, 2007. http://hdl.handle.net/2237/18429.
Texto completo da fonteRickett, Gavin Leon. "The performance of supported noble metal catalysts in conditions of catalytic combustion". Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441326.
Texto completo da fonteKaufman, Gabrielle. "Gaspar Cassado : a study of Catalan cello arrangements and cello performance style". Thesis, Birmingham City University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.631677.
Texto completo da fonteWang, Yi. "Synthesis and catalytic performance of hierarchical Zeolites supported Nickel-Tungsten hydrodesulfurization catalysts". Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10124/document.
Texto completo da fonteMore and more strict regulations were drawn up in many countries to limit the concentration of sulfur below 10 ppm or 15 ppm in transportation fuel oil. Therefore, more efficient catalysts have to be developed. In this work, hierarchical Beta and Mordenite zeolite supported nickel-tungsten catalysts were prepared and evaluated in hydrodesulfurization (HDS) reactions.Firstly, hierarchical Beta zeolite was prepared by post-treatment and characterized by XRD, N2-sorption, SEM/TEM and NMR techniques. As a result, hierarchical zeolite Beta prepared by base-acid treatment exhibited excellent catalytic activity in acid-catalytic reactions, especially towards large molecules. NiW catalysts supported on Al2O3, commercial Beta and Mordenite zeolites (HB and HM), and hierarchical Beta and Mordenite prepared by post treatment (HB-M and HM-M) were characterized by XRD, N2 sorption, IR, TEM and XPS. Zeolite supported catalysts exhibited higher catalytic performance in the HDS of 4,6-DMDBT, due to the strong acidity of the zeolitic support that supplied an additional isomerization reaction route. The use of hierarchical zeolite could further improve the isomerization ability of catalyst. As a result, the HDS activity of 4,6-DMDBT over NiW/HM-M and NiW/HB-M was more than twice as that of NiW/Al2O3. The deactivation of hierarchical Beta zeolite supported catalysts was studied in the HDS of thiophene. Interestingly, mixing NiW/HB or NiW/HB-M with NiW/Al2O3 and the utilization of Na+-exchanged Beta as support (NiW/NaB) improved remarkably the anti-deactivation ability of the catalysts. As a result, NiW/NaB-M and mixture catalyst gave superior catalytic activity than NiW/HB-M and NiW/Al2O3
Jaf, Zainab. "Catalytic performance, Thermo-elastic, surfaces and coating properties of transition metal nitrides". Thesis, Jaf, Zainab (2018) Catalytic performance, Thermo-elastic, surfaces and coating properties of transition metal nitrides. PhD thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/42920/.
Texto completo da fonteFong, Jenny L. "The study of the effect of an alkaline pulping catalyst derived from plicatic acid /". Thesis, McGill University, 1986. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=65541.
Texto completo da fonteLively, Treise. "Ethanol fuel cell electrocatalysis : novel catalyst preparation, characterization and performance towards ethanol electrooxidation". Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602560.
Texto completo da fonteGomes, Pedro Miguel Vidinha. "Strategies for the enhancement of the catalytic performance of cutinase in nonaqueous media". Doctoral thesis, Faculdade de Ciências e Tecnologia, 2007. http://hdl.handle.net/10362/9364.
Texto completo da fontesharafi, mona. "Bottom-Up Synthesis Of Macromolecules And Their Selective Catalytic Performance At The Nanoscale". ScholarWorks @ UVM, 2020. https://scholarworks.uvm.edu/graddis/1189.
Texto completo da fonteMercier, Anne-Gaelle. "Etude et réalisation de couches actives de PEFMC architecturées". Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENI050.
Texto completo da fontePEM fuel cells stand for an essential link in the cycle using hydrogen as an energy carrier.However, their development is still limited by initial performance, costs and durability.This study focuses on the electrode catalyst layer which contains most of the time platinum, anexpensive catalyst that can represent 25% of the overall cost of a system. Thus, one of the issues hasbeen to provide a better understanding of electrode operating, which can be heterogeneous. The aim ofthis study is particularly to enhance platinum distribution in the catalyst layer to optimize itsutilization.Architectured electrodes, that is to say with variable platinum loading inside the catalyst layerhave been developed thanks to the flexibility of two printing processes : inkjet printing and screenprinting. The adjustment of catalyst ink formulation and printing parameters enabled to fabricatecatalyst layers with a wide range of platinum loading, from 0,05mgPt/cm² to 0,5mgPt/cm². Severalplatinum distributions were compared to uniform catalyst layers at different scales: the scale of ribsand channels and of gas inlet and oultet of bipolar plate, as well as through the catalyst layer thickness.Electrodes architecture enabled to point out different contribution of catalyst layers according to itslocalizing under the bipolar plate and to suggest modifications of its structure that provide an increaseof performance.Otherwise, the estimation of lifetime of several architectures thanks to ageing tests in loadcycling mode showed that these structures enabled to reduce their performance decay rate
Väliheikki, A. (Ari). "Resistance of catalytic materials towards chemical impurities:the effect of sulphur and biomaterial-based compounds on the performance of DOC and SCR catalysts". Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212845.
Texto completo da fonteTiivistelmä Pakokaasupäästöissä olevat typen oksidit (NOx), hiilivedyt (HCs) ja hiilimonoksidi (CO) ovat haitallisia ihmisten terveydelle ja ympäristölle. Katalyysi on tehokas menetelmä vähentää näitä päästökomponentteja. Polttoaineet ja voiteluöljyt sisältävät epäpuhtauksia, jotka siirtyvät myös pakokaasuihin. Tästä johtuen pakokaasupäästöjen hallinnassa tarvitaan katalyyttimateriaaleja, joilla on hyvä vastustuskyky myrkyttymistä vastaan. Tavoitteena oli saada uutta tietoa kemiallisten epäpuhtauksien vaikutuksesta katalyyttien toimintaan. Biopolttoaineiden sisältämät mahdolliset epäpuhtaudet selvitettiin analysoimalla fossiilisen ja biopolttoaineen palamisessa muodostuvia partikkeleita ja vertaamalla niitä polttoaineiden hivenaineanalyysiin. Tutkimuksessa käytetyt zeoliitti (ZSM-5), cerium-zirkonium-sekaoksidi (CeZr) ja pii-zirkonium-oksidipohjaiset (SiZr) katalyytit käsiteltiin epäpuhtauksilla (kalium, natrium, fosfori ja rikki) kaasu- ja nestefaasissa. Tutkimuksessa käytettiin useita karakterisointitekniikoita, joiden avulla selvitettiin epäpuhtauksien vaikutuksia katalyyttien ominaisuuksiin. Katalyyttien toimintaa testattiin laboratoriomittakaavan kokeissa CO:n ja HC-yhdisteiden hapetuksessa sekä NOx:ien pelkistyksessä käyttäen ammoniakkia (NH3) tai vetyä (H2) pelkistimenä. Tulokset osoittavat, että CeZr-pohjaisten katalyyttien aktiivisuus NOx:ien pelkistyksessä oli hyvä käytettäessä pelkistimenä NH3:a ja kohtalainen käytettäessä vetyä. Rikki paransi CeZr-katalyyttien aktiivisuutta NOx:ien pelkistyksessä, mikä johtui kemiallisesti sitoutuneen hapen osuudesta katalyyttien pinnoilla. Vastaavasti hiilivetyjen ja CO:n hapetusreaktioissa rikki ei vaikuttanut SiZr-pohjaisten dieselhapetuskatalyyttien aktiivisuuteen. Sekä CeZr- ja SiZr-pohjaisia katalyytteja voidaan siten käyttää rikkiä sisältävien pakokaasujen puhdistuksessa. SiZr-pohjaisten katalyyttien aktiivisuus laski fosforin vuoksi. ZSM-5-pohjaiset katalyytit olivat vastustuskykyisiä kaliumille ja natriumille. Kestäviä katalyyttejä on siten kehitettävä, mikäli biopolttoaineiden sisältämien epäpuhtauksien poistaminen polttoaineista ei ole mahdollista
Roso, Martina. "Multistructured membranes based on electro-dynamic technologies: process optimization and catalytic performances". Doctoral thesis, Università degli studi di Padova, 2009. http://hdl.handle.net/11577/3426399.
Texto completo da fontele tecnologie elettroidro dinamiche costituiscono un valido strumento nell'ambito delle nanotecnologie per la produzione di membrane multistrutturate e multifunzionali costituite da nanofibre e nanoparticelle che trovano applicazione nel settore della fotocatalisi per la rimozione di VOCs. Prima di procedere alla produzione vera e propria è necessario ottimizare il processo di elettrofilatura. a tal riguardo la metodologia di risposta delle superfici è un valido strumento per esplorare il processo, valutare e stabilire un'adeguata relazione tra la variabile risposta e le variabili di processo e rilevare la configurazione più adeguata per l'ottenimento di una fissata risposta. Successivamente, è stato implementato un metodo per la produzione di membrane multistrato in cui particelle inorganice sono depositate su nanofibre polimeriche. Tali membrane sono state adeguatamente caratterizzate ed è stata studiata la loro attività catalitica nei confronti di agenti inquinanti.
Wang, Fagen. "Hydrogen production from steam reforming of ethanol over an Ir/ceria-based catalyst : catalyst ageing analysis and performance improvement upon ceria doping". Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00967128.
Texto completo da fonteBaik, Jungshik. "Experimental Investigation of the Effect of Composition on the Performance and Characteristics of PEM Fuel Cell Catalyst Layers". Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/34438.
Texto completo da fonteMaster of Science
Pinabiau, Maryse. "Préparation, caractérisation et performances catalytiques de réservoirs d'hydrogène "intermétalliques terres rares - nickel oxydes"". Lille 1, 1987. http://www.theses.fr/1987LIL10116.
Texto completo da fonteFedock, John Andrew. "Low temperature polymer electrolyte fuel cell performance degradation". [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002565.
Texto completo da fonteCabiac, Amandine. "Influence des propriétés texturales et de la méthode de préparation sur les performances hydrogénantes de catalyseurs Pd/C". Montpellier 2, 2006. http://www.theses.fr/2006MON20167.
Texto completo da fonteLu, Yaxiang. "Advanced one-dimensional nanostructures for high performance catalyst electrodes in polymer electrolyte fuel cells". Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6469/.
Texto completo da fonteHajar, Yasmine. "Effect of Electrochemical Promotion and Metal-Support Interaction on Catalytic Performance of Nano-catalysts". Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39701.
Texto completo da fonteJiang, Lulu. "Catalytic Performance and Characterization of Zn-doped Cryptomelane-type Manganese Dioxide For Ethanol Oxidation". Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1352827354.
Texto completo da fonteCheng, Feng. "Bio-compounds as reducing agents of reforming catalyst and their subsequent steam reforming performance". Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7715/.
Texto completo da fonte