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Dissertations / Theses on the topic 'Catalysts – Analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Beskari, Mohamed Ali. "Dynamic analysis of diffusion and convection in porous catalysts." Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244857.

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2

Kwon, Doo Hyun. "Computational Design and Analysis of Molecular Ethylene Oligomerization Catalysts." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8551.

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Linear alpha olefins (LAOs) are key petrochemical precursors for the synthesis of larger polymers, detergents, plasticizers, and lubricants. Most catalytic ethylene oligomerization processes generate a wide distribution of LAO carbon chain lengths. A major ongoing industrial challenge is to develop homogeneous catalysts that result in selective and tunable ethylene oligomerization to 1-hexene and 1-octene alkenes. Quantum mechanical calculations coupled with rapidly advancing technology have enabled the ability to calculate small molecule systems with high accuracy. Employing computational mod

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3

Ahuja, Vishal. "Analysis of novel transition metals as catalysts for oxygen delignification." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62909.pdf.

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4

Fomes, Charles William. "Development of novel oxidation catalysts for carbon isotope ratio analysis." Thesis, Open University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343742.

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5

Lentz, Samuel D. "Development and optimization of NOx reduction catalysts using statistical analysis." Connect to resource, 2009. http://hdl.handle.net/1811/36953.

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6

Allcock, Gillian C. "The statistical aspects of the analysis and design of enzyme kinetic studies." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366536.

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7

Dai, Shuanghua Patrick. "X-ray scattering and thermal analysis study of isotactic polypropylene /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2000.

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Thesis (Ph.D.)--Tufts University, 2000.<br>Submitted to the Dept. of Physics. Adviser: Peggy Cebe. Includes bibliographical references (leaves 246-251). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

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8

Mullet, Dianna Rose. "Catalysts of Women's Success in Academic STEM: A Feminist Poststructural Analysis." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062911/.

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This study analyzes senior women faculty's discourses about personal and professional experiences they believe contributed to their advancement in academic careers in science, technology, engineering, and mathematics (STEM). The purpose of the study is to understand factors that activate women's success in STEM disciplines where women's representation has not yet attained critical mass. A poststructuralist emphasis on complexity and changing nature of power relations offers a framework that illuminates the ways in which elite women navigate social inequalities, hierarchies of power, and non-de

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9

Haibo, E. "Quantitative analysis of core-shell nanoparticle catalysts by scanning transmission electron microscopy." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:19c3b989-0ffb-487f-8cb3-f6e9dea83e63.

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This thesis concerns the application of aberration corrected scanning transmission electron microscopy (STEM) to the quantitative analysis of industrial Pd-Pt core-shell catalyst nanoparticles. High angle annular dark field imaging (HAADF), an incoherent imaging mode, is used to determine particle size distribution and particle morphology of various particle designs with differing amounts of Pt coverage. The limitations to imaging, discrete tomography and spectral analysis imposed by the sample’s sensitivity to the beam are also explored. Since scattered intensity in HAADF is strongly dependen

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10

Nguyen, Tuan Huy Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Semiconductor oxide supported Mo and Mo-W carbide catalysts for Fischer-Tropsch synthesis." Awarded by:University of New South Wales. School of Chemical Sciences and Engineering, 2006. http://handle.unsw.edu.au/1959.4/26969.

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Fischer-Tropsch synthesis reaction to produce sulphur free hydrocarbons has enjoyed a resurgent in interests due to increases in world oil prices. In this work, the suitability of Mo and Mo-W carbides has been investigated as a possible cost-effective alternative to noble metals in Fischer-Tropsch synthesis. The molybdenum and tungsten monometallic and bimetallic carbides were prepared through precipitation from homogeneous solution to the sulphide followed by carburization with a mixture of propane and hydrogen to produce the resulting metal carbide. A 23 factorial design strategy was employe

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11

Tau, Prudence Lerato. "Study of titanium, tantalum and chromium catalysts for use in industrial transformations." Thesis, Rhodes University, 2007. http://hdl.handle.net/10962/d1005028.

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PART A The syntheses, spectroscopic and electrochemical characterisation of a series of titanium and tantalum phthalocyanine complexes are reported. The complexes are unsubstituted and substituted at either the peripheral or non-peripheral positions with sulphonates, aryloxy, arylthio or amino groups. The complexes mostly exhibit Qbands in the near-infrared region as well as interesting properties in different solvents. The interaction of differently sulphonated titanium and tantalum phthalocyanine complexes with methyl viologen (MV[superscript 2+]), and hence the stoichiometry and association

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12

Morgan, David Rees. "In situ ¹³C NMR monitoring of the dehydration of 2-propanol over H-ZSM-5." Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/52091.

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The first <i>in situ</i> ¹³C NMR monitoring of zeolite catalyzed reaction is described. The dehydration of 2-propanol over H-ZSM-5 was observed using solution type techniques. Although this produces broad lines, several mechanistic details were elucidated. This study indicates that: 1) the dehydration does not proceed through a cyclopropyl carbenium ion intermediate, 2) propene oligomerizes on the catalyst and reaches a steady state concentration before propene is desorbed, and 3) the 2-propanol flowing over the catalyst does not react with the oligomerized propene.<br>Master of Science

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13

Liu, Wei. "Preparation, characterization, and catalytic properties of alkaline earth oxide MO (M=Ca, Mg, Sr, Ba)--modified VOx/SBA-15 catalysts for the oxidative dehydrogenation of n-butane." HKBU Institutional Repository, 2007. http://repository.hkbu.edu.hk/etd_ra/885.

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14

Nylén, Ulf. "Development of ring-opening catalysts for diesel quality improvement." Licentiate thesis, KTH, Chemical Engineering and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1712.

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<p>The global oil refining industry with its present shift inproduct distribution towards fuels such as gasoline and dieselwill most likely hold the fort for many years to come. However,times will change and survival will very much depend onprocessing flexibility and being at the frontiers of refiningtechnology, a technology where catalysts play leading roles.Today oil refiners are faced with the challenge to producefuels that meet increasingly tight environmentalspecifications, in particular with respect to maximum sulphurcontent. At the same time, the quality of crude oil is becomingworse wi

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15

Murdoch, Alexander. "Structural and compositional analysis of cobalt palladium model catalyst surfaces." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3640.

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To date there has been much work carried out in the field of surface science to gain a better understanding of the fundamentals of a wide range of catalytic systems and reactions. The central theme of this thesis relates to cobalt based Fischer-Tropsch synthesis (FTS) with particular focus on the structure, composition and surface chemistry of CoPd bimetallic systems and on the interaction of Co with oxide support materials. In the work described in this thesis MEIS and STM are used to examine the growth of Co on Pd{111} and to characterise the structure of CoPd alloys created by thermal treat

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16

Nylén, Ulf. "Ring-opening catalysts for cetane improvement of diesel fuels." Doctoral thesis, KTH, Kemiteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-537.

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The global oil refining industry with its present product distribution essentially shifted towards fuels such as gasoline and diesel will most likely hold the fort for considerable time. However, conditions are changing and refinery survival will very much depend on long-term planning, process and product flexibility and being at the frontiers of refining technology, a technology where catalysts play leading roles. Today oil refiners are faced with the challenge of producing fuels that meet increasingly tight environmental specifications, in particular with respect to maximum sulphur content.

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17

Caglar, Basar. "Nox Storage And Reduction Over Ce-zr Mixed Oxide Supported Catalysts." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610418/index.pdf.

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NOx storage and reduction activities of Pt/BaO/CexZr1-xO2 (x= 1, 0.75, 0.5, 0.25, 0) catalysts were investigated by transient reaction analysis and Diffuse Reflectance Infrared Fourier Tramsform Spectroscopy (DRIFTS). Pt/BaO/Al2O3 catalyst was used as reference catalyst. Ce-Zr mixed oxides were synthesized by means of Pechini Method. Pechini method is a sol-gel like method based on mixing the related mixed oxide precursors with an &amp<br>#945<br>-hydroxy carboxylic acid. 10% BaO (w/w) and 1% Pt (w/w) were deposited on synthesized mixed oxide and reference alumina support via incipient wetness

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18

Kissounko, Natalia. "Study of dynamics in a reaction catalyzed by ht- and ps-ADH cloning, purification and preliminary x-ray screening /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 80 p, 2008. http://proquest.umi.com/pqdweb?did=1605142871&sid=6&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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19

Halan, Babu [Verfasser]. "Biofilms as living catalysts for fine chemical synthesis: analysis, process design and scale-up / Babu Halan." Aachen : Shaker, 2013. http://d-nb.info/1051574633/34.

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20

Nandi, Shreya. "Investigation of perovskite-based three-way catalysts using surface analysis techniques and in situ/operando spectroscopy." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R072.

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Le post-traitement catalytique des gaz d’échappement des moteurs à essence nécessite la conversion simultanée de CO,NO et des hydrocarbures. Ce procédé est connu sous le nom de catalyse trois voies (TWC). Les matériaux à base de perovskites comme LaFeO3, décrits comme des supports "intelligents", sont considérés comme des candidats potentiels dans la recherche d’alternatives aux catalyseurs trois voies classiques, dans un contexte de réduction de leur teneur en métaux nobles. Ces catalyseurs massiques présentent en surface une composition souvent différente de leur formule chimique, qui caract

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21

Van, Wyck Neal Edward. "MULTIPHOTON SPECTROSCOPY OF THIN FILMS AND SURFACES (NONLINEAR, WAVEGUIDES, INTERFACES)." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/291294.

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22

Lakhapatri, Satish L. "Analysis of Deactivation Mechanism on a Multi-Component Sulfur-Tolerant Steam Reforming Catalyst." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279327420.

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23

Woo, Jungwon. "Bulk and Surface Characteristics of Model M1 and M2 Phase Catalysts for Propane Ammoxidation to Acrylonitrile." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1445615206.

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24

Ault, Trevor Joseph. "A techno-economic analysis of ethanol production from hydrolysis of cellulose with nanoscale magnetic solid acid catalysts." Kansas State University, 2012. http://hdl.handle.net/2097/14746.

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Master of Science<br>Department of Chemical Engineering<br>Keith Hohn<br>Acid catalysts have been shown to be very successful in the pretreatment of cellulosic biomass to improve glucose yield and improve overall yield of ethanol. This report presents the results of a techno-economic study that looks into the use of nanoscale magnetic solid acid catalysts for glucose production. Magnetic solid acid catalysts are an improvement over using diluted acid due to eliminating acid-waste generation and corrosion hazards. Their magnetic nature also allows them to be easily separated from reaction p

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25

Wei, Bo. "A novel solar-driven system for two-step conversion of CO2 with ceria-based catalysts." Doctoral thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-152899.

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Global warming is an unequivocal fact proved by the persistent rise of the average temperature of the earth. IPCC reported that scientists were more than 90 % certain that most of the global warming was caused by increasing concentrations of greenhouse gases (GHG) produced by human activities. One alternative to combat the GHG is to explore technologies for utilizing CO2 already generated by current energy systems and develop methods to convert CO2 into useful combustible gases. Two-step conversion of CO2 with catalysts is one of the most promising methods. Ceria (CeO2) is chosen as the main c

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26

Wang, Meng. "Steam reforming of model compounds of bio-oil with and without CO₂ sorbent." HKBU Institutional Repository, 2014. https://repository.hkbu.edu.hk/etd_oa/212.

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Hydrogen as a clean energy carrier has drawn great attention. Production of H2 from sustainable bio-oil is considered an alternative for conventional fossil fuel based energy system, since the overall process of bio-oil converting to H2 ideally is carbon-neutral and hence environmental friendly. This study focuses on developing an adequate catalyst for bio-oil steam reforming to produce H2. Ruthenium and/ or nickel based catalysts supported on alumina, ceria-alumina or ceria-silica were synthesized by sol-gel method or incipient wetness impregnation and characterized using BET Surface area an

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27

Villaseñor, Milán Ángela. "Development and optimization of methods for elemental quantitative analysis of catalysts and polymers through laser ablation-ICP techniques." Doctoral thesis, Universidad de Alicante, 2018. http://hdl.handle.net/10045/97855.

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En la presente Tesis Doctoral la técnica de ablación laser acoplada a ICP-OES/MS ha sido empleada para analizar muestras sólidas, como catalizadores usados en el refinado del petróleo y polímeros. Se han llevado a cabo dos tipos de análisis, un análisis global de las muestras que proporciona información general y un análisis localizado que permite obtener información acerca de la distribución espacial de los elementos de interés en las muestras. Las diferentes variables de la técnica ablación láser son estudiadas con el fin de seleccionar aquellas que conducen una señal alta y estable, así com

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28

Alston, Ben. "Aqueous polyoxometalates : design and analysis of electrochemical catalysts for the indirect reduction of oxygen in PEM fuel cells." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/16233/.

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The applicability of aqueous, mixed addenda polyoxometalates with the general formula [PMo12-xVxO40](3+x)- as catalysts for FlowCath® technology has been demonstrated. These compounds were used as a platinum substitute in the PEM fuel cell cathode for the indirect reduction of oxygen. The effect of increased vanadium substitution within the Keggin structure upon the diffusion coefficient (Do) and the standard rate constant for electron transfer (ko) was investigated via simulation and electrochemical analysis. The apparent decrease in electrode kinetics linked with increased vanadium substitut

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29

Reineri, Daniele. "Síntese e caracterização dos coprecipitados de cálcio e alumínio com 8-hidroxiquinolina e avaliação catalítica na reação de transesterificação." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1504.

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O presente estudo teve como objetivo sintetizar, caracterizar e avaliar a atividade catalítica em reação de transesterificação do material formado após a decomposição térmica dos coprecipitados de cálcio e alumínio com 8-hidroxiquinolina. A síntese do material foi realizada por intermédio da metodologia de coprecipitação, utilizando como agente precipitante a 8-hidroxiquinolina. Para avaliar a presença dos metais cálcio e alumínio sobre as caracteristicas do material, utilizou-se variadas porcentagens destes metais na síntese dos complexos, utilizando-se das mesmas condições reacionais, com pH

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30

Butts, Robert Andrew. "Kinetic parameters from statistical analysis of TREF profiles and the preparation of MgCl¦2 as supports for polymerization catalysts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0011/MQ60106.pdf.

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31

Brown, Jared C. "UV Visible Spectra Analysis of High Temperature Water Gas Shift Catalysts Made from Iron, Lanthanum, Copper, and Chromium Oxides." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3222.

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Hydrogen is a vital component in several different chemical reactions as well as a potential fuel source for the future. The water gas shift (WGS) reaction converts CO and water to hydrogen and CO2. The objective of this work is to first, characterize the potential benefits of the addition of lanthanum oxide (lanthana) to the iron-chromium-copper (Fe-Cr-Cu) oxide catalysts industrially used in high temperature water gas shift processes, and second, analyze these catalysts using in-situ UV-Visible spectroscopy. The benefits of each component in the catalyst are discussed as well as potential be

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32

Rankin, Andrew Gordon McLaughlin. "Applications of multinuclear solid-state NMR spectroscopy to the characterisation of industrial catalysts." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/12793.

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This thesis describes applications of advanced multinuclear solid-state nuclear magnetic resonance (NMR) experiments to the characterisation of industrially-relevant catalyst materials. Experiments on γ-Al₂O₃ introduce the use of solid-state NMR spectroscopy for the investigation of disordered solids. The existence of Al(V) sites on the surface of this material is demonstrated, showing that removal of adsorbed H₂O may facilitate a rearrangement effect in γ-Al₂O₃ that promotes the formation of these Al environments. A range of aluminium oxide-based supported metal catalysts has been investigate

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33

Karamullaoglu, Gulsun. "Dynamic And Steady-state Analysis Of Oxidative Dehydrogenation Of Ethane." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606269/index.pdf.

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In this research, oxidative dehydrogenation of ethane to ethylene was studied over Cr-O and Cr-V-O mixed oxide catalysts through steady-state and dynamic experiments. The catalysts were prepared by the complexation method. By XRD, presence of Cr2O3 phase in Cr-O<br>and the small Cr2O3 and V2O4 phases of Cr-V-O were revealed. In H2-TPR, both catalysts showed reduction behaviour. From XPS the likely presence of Cr+6 on fresh Cr-O was found. On Cr-V-O, the possible reduction of V+5 and Cr+6 forms of the fresh sample to V+4, V+3 and Cr+3 states by TPR was discovered through XPS. With an O2/C2H6 fe

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34

Sen, Fatih. "The Preparation And Analysis Of New Carbon Supported Pt And Pt+second Metal Nanoparticles Catalysts For Direct Methanol Fuel Cells." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614728/index.pdf.

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In this thesis, firstly, carbon-supported platinum nanoparticle catalysts have been prepared by using PtCl4 and H2PtCl6 as starting materials and 1-hexanethiol, and tert-octanethiol, as surfactants for the first time. Secondly, these prepared catalysts were heated to 200 &deg<br>C, 300 &deg<br>C, and 400 &deg<br>C for 4 h under argon gas. Lastly, PtRu/C catalysts, which have different atomic percent ratios of Pt and Ru (Pt/Ru: 0.8, 2.1 and 3.5), were prepared using PtCl4 and RuCl3 as starting materials and tert-octanethiol as a surfactant. Each was characterized by X-ray diffraction, transmis

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35

Song, Hua. "Investigation of Reaction Networks and Active Sites in Bio-ethanol Steam Reforming over Cobalt based Catalysts." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243999804.

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36

Shirvani, Tara. "The role of catalysts and algae in forming a sustainable solution for a global food and fuel crisis." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:30af0957-1ed6-4ea7-949b-f120606ab22e.

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This thesis undertakes three separate lifecycle analyses to determine the emissions and fossil energy demand required to process algae biomass into renewable fuel and animal feed. A complete well-to-wheel fuel-cycle analysis is conducted for the production of biodiesel and jet biofuel from algae biomass. The environmental impacts of algae-based fuels for the road transportation and aviation industry are benchmarked against analogue conventional fossil fuels. This thesis demonstrates that algae biofuel production can only realize its inherent environmental advantage of reduced GHG emissions, on

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37

Naidoo, Preloshni. "A comparative analysis of the chemical composition of linear low density polyethylene polymers synthesised with 1- hexene comonomer under different catalytic conditions." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80272.

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Thesis (MSc)--Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: A comparative study of the chemical composition of linear low density polyethylene polymers, synthesised with 1 - hexene as comonomer was conducted. Catalyst trials were conducted on the linear low density 1 - hexene polymer grade material to evaluate alternative catalysts. A comparative analysis was performed in order to investigate if the samples synthesised under catalyst trial conditions showed any significant differences in terms of crystallinity and mechanical properties with the reference sample that was synthesised using

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38

MacArthur, Katherine E. "Quantitative structural and compositional characterisation of bimetallic fuel-cell catalyst nanoparticles using STEM." Thesis, University of Oxford, 2015. http://ora.ox.ac.uk/objects/uuid:6ce29b0c-1e7e-4604-ba5b-22f2ebd03d4e.

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Platinum-based catalysts for hydrogen fuel-cell applications have progressed greatly with the addition of a second element in either a mixed-alloy or core-shell structure. Not only do they contain a reduced amount of the more expensive platinum metal but they have been shown to demonstrate a significant improvement in catalytic activity. Further improvement of these systems can only be made by careful investigation of such catalyst panoparticles on an atomic scale. These nanoparticles provide a significant characterisation challenge due to their minute size and beam sensitivity. A new method o

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Wang, Xingli [Verfasser], Peter [Akademischer Betreuer] Strasser, Frédéric [Gutachter] Jaouen, and Peter [Gutachter] Strasser. "Copper-based nanostructured catalysts for efficient and selective CO2 electroreduction – synthesis, catalytic performance, and mechanistic analysis / Xingli Wang ; Gutachter: Frédéric Jaouen, Peter Strasser ; Betreuer: Peter Strasser." Berlin : Technische Universität Berlin, 2020. http://d-nb.info/1209601494/34.

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40

Stokoe, Robert B. "Conformational and mechanistic studies on asymmetric cyanohydrin synthesis : an analysis of the dipeptide catalysts cyclo-[(S)-His-(S)-Phe], cyclo-[(S)-His-(S)-Leu] and related compounds." Thesis, Bangor University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320398.

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41

ROCHA, SORAYA M. R. da. "Síntese e caracterização de precursores para catalisadores termicamente estáveis à base de lantanideos pelo método sol-gel." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11271.

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Made available in DSpace on 2014-10-09T12:50:08Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:58:43Z (GMT). No. of bitstreams: 1 10459.pdf: 5417083 bytes, checksum: ed654658e2629338a19dc7ae0a312583 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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SILVA, SIRLANE G. da. "Estudo do efeito do suporte em catalisadores de Cobalto e Níquel para obtenção de Hidrogênio a partir da reforma a vapor do etanol." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10177.

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Made available in DSpace on 2014-10-09T12:35:39Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:58Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Kováč, Martin. "Katalyzátory pro kladnou elektrodu kyslíko-vodíkového palivového článku." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218699.

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Master's thesis deals with new methods of preparing catalytic materials for positive electrode of an oxygen-hydrogen fuel cell and the influence of potassium permanganate or doping agent molar mass change on theirs attributes. Further it studies the use of proper measuring methods designed to qualify theirs attributes and the presentation of achieved results. In particular methods of linear sweep and cyclic voltammetry and the processing of data using Koutecky-Levich and Tafel plot and wave log analysis. Values of half-wave and onset potential and kinetic coefficient have been measured and cal

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44

Haire, Andrew Richard. "Probing the influence of bimetallic composition on the Pd/Au catalysed synthesis of vinyl acetate monomer." Thesis, University of St Andrews, 2010. http://hdl.handle.net/10023/1018.

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Scanning Tunnelling Microscopy (STM) was utilised together with the high resolution depth-profiling capabilities of Medium Energy Ion Scattering (MEIS), a technique traditionally associated with single crystal substrates, to probe the mean size and depth dependent composition profile of bimetallic PdAu nanoparticles on planar oxide surfaces as functions of the starting composition and annealing temperature. In order to fit composition profiles to experimental MEIS data, a new analysis tool has been designed that models the particles as flat-topped structures with a hexagonal base which can be

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45

Lundgren, Stina. "Efficient Synthesis and Analysis of Chiral Cyanohydrins." Doctoral thesis, Stockholm : Kungliga Tekniska högskolan (KTH), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4315.

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Kebe, Seydina Ibrahima. "Synthèse de matériaux monolithiques pour la séparation et la catalyse en phase liquide : problématiques environnementales et du développement durable." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1127/document.

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Les matériaux polymères ont connu un engouement considérable avec l’avènement de l’ère du pétrole et connaissent aujourd’hui encore un succès considérable notamment au travers de la valorisation de ressources naturelles mais également d’applications spécifiques à haute valeur ajoutée, liées à des domaines aussi divers que la chimie analytique, l’exploration spatiale, la médecine où l’enjeu premier est souvent la conception d’objet miniaturisés. Dans ce travail de thèse nous avons développé des matériaux polymères à taille micrométrique, immobilisés soit dans des microcanaux (diamètre interne =

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Reece, Christian. "Kinetic analysis and modelling in heterogeneous catalysis." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/103737/.

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A combination of Temporal Analysis of Products, Temperature Programmed Reduction, and Density Functional theory techniques have been used to perform kinetic analysis on data from heterogeneous catalysis experiments. A new method of data filtering has been developed for Temporal Analysis of Products, and has been applied to a system of 4 Pt−Mo2C, and the current methodology has been expanded upon to calculate rate coefficients for the oxidation of CO to CO2 via the Boudard reaction. From the kinetic constants it appears that a phase change occurs in the material at approximately 200�C. The curr

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Autin, Laura. "Étude des cinétiques de réticulation et de la dynamique moléculaire de réseaux silicones : compréhension des mécanismes catalytiques par analyse viscoélastique et RMN." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10258.

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La catalyse de polycondensation des silicones, et notamment des élastomères vulcanisables à froid bicomposants, constitue un enjeu scientifique, environnemental et économique. Le dilaurate de dibutyl étain (DLDBE), classé CMR2, très largement utilisé dans l'industrie du silicone sera prochainement interdit par la nouvelle réglementation REACH. L'objectif de cette étude est donc d'étudier de nouveaux systèmes catalytiques des réactions de polycondensation. L'effet des différents constituants de la formulation (masse molaire du PDMS réactif, concentration en réticulant, concentration en catalyse

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Penkala, Bartosz. "Low Temperature Oxygen Mobility Applied to Catalysis." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS022.

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Accomplir les spécifications des nouvelles réglementations concernant les gaz d'échappement de post-traitement des technologies automobiles, par exemple, TWC, implique la disponibilité et l'utilisation de matériaux catalytiquement actifs et notamment des composés tampons d'oxygène, ce qui peut réversible stocker et libérer de grandes quantités de l'oxygène. Oxyde de cérium dopé présente encore aujourd'hui le seul composé de référence pour un support approprié, en raison de sa grande capacité de stockage de l'oxygène et possibilité de créer facilement des lacunes en ions d'oxygène. Cependant, p

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Margeriat, Alexandre. "Conversion catalytique des vapeurs de pyrolyse et molécules modèles." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1340/document.

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La pyrolyse rapide de biomasse lignocellulosique produit des bio-huiles avec des rendements élevés mais ces liquides contiennent de nombreux composés oxygénés, une acidité élevée et de ce fait sont instables. Un hydrotraitement poussé de ces huiles est nécessaire avant qu'elles puissent être utilisées comme combustibles liquides. Afin de réduire le coût et d'améliorer les performances de l'hydrotraitement ultérieur, plusieurs stratégies ont été proposées pour réduire les teneurs en oxygène et en acides, comme l'ajout d'un lit catalytique après la pyrolyse. La conversion catalytique des vapeurs

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