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Dissertations / Theses on the topic 'Gold. Catalysts. Oxidation'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Hall, Matthew Scott. "Gold catalysts for oxidation and hydrogenation reactions." Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/55942/.

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Iron oxide supported gold catalysts were tested for the room temperature oxidation of carbon monoxide. The effect of heat treatment on the activity of the catalysts was investigated the catalysts being heated to 75, 120, 200, 300 and 400°C. The most active catalysts were obtained by using a calcination temperature of 120°C. Gold catalysts supported on zinc oxide were also tested for activity in the oxidation of carbon monoxide at room temperature. These catalysts were found to be less active than the Au/FejCh catalysts. The effect of heat treatment was also investigated, and the uncalc
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2

Kydd, Richard Berwick Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Synthesis and characterisation of gold and copper oxidation catalysts." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44549.

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In this work, Gold and Copper oxidation catalysts supported on a range of metal oxides were synthesised via 2 previously uninvestigated preparation methods. In the first chapter, Gold nanoparticle catalysts were deposited onto TiO2, CeO2 and ZrO2 nanoparticles via the non-aqueous Modified Photodeposition procedure. This method was found to produce smaller Gold particle sizes following intrinsic excitation of the support than the conventional aqueous phase method, with surface physisorbed water apparently acting as the sacrificial reductant. The as prepared catalysts were drastically more activ
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3

Brett, Gemma Louise. "The selective oxidation of bioderived molecules by gold catalysts." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/28662/.

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The selective oxidations of the bioderived molecules, 1,2-propanediol, 1,3-propanediol and glycerol, were investigated using gold based catalysts. These reactions were carried out in both low pressure glass reactors and high pressure autoclaves. The reaction conditions such as temperature and amount of base were investigated to order to achieve the optimum conditions. The gold based catalysts used were prepared by sol immobilisation and impregnation methods. The supports tested were activated carbon, titania, ceria and magnesium oxide. The ceria supported catalyst was demonstrated to be extrem
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4

Bawaked, Salem Mohammed. "Solvent free alkene oxidation using supported nano-gold catalysts." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55088/.

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Oxidation is an important route for the activation of chemical feedstock for the synthesis of chemical intermediates. Alkene epoxidation by the electrophilic addition of oxygen to a carbon-carbon double bond is a major challenge in oxidation catalysis. In particular it is important to use molecular oxygen as the oxidant to avoid the formation of reagent by products. Although molecular oxygen is the most environmentally benign oxidant in many cases, far more reactive forms of oxygen are required to achieve reaction, and this can lead to by-products with a heavy environmental burden with respect
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5

Royker, Mariam. "Platinum promotion in supported gold catalysts for glycerol oxidation." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/11987.

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Includes synopsis.<br>Includes bibliographical references.<br>There has been recently a drive toward cleaner fuels, with biodiesel proving to be a viable option. It is obtained by the transesterification of triglycerides, with glycerol as the main coproduct. Approximately 100kg of glycerol is formed per ton of biodiesel produced.
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6

Ventimiglia, Alessia. "Theoretical and experimental studies of gold catalysts for glucose oxidation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21701/.

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The glucaric acid (GLA) has been identified as a “top value-added chemical from biomass” that can be employed for many uses; for instance, it could be a precursor of adipic acid, a monomer of Nylon-6,6. GLA can be synthetized by the oxidation of glucose (GLU), passing through the intermediate gluconic acid (GLO). In recent years, a new process has been sought to obtain GLA in an economic and environmental sustainable way, in order to replace the current use of HNO3 as a stoichiometric oxidant, or electrocatalysis and biochemical synthesis, which show several disadvantages. Thereby, this work
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7

Haider, Peter Sebastian. "Potential of gold-based catalysts for catalytic oxidation with oxygen /." Zürich : ETH, 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18223.

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8

Lee, Seung-Jae. "Development of supported gold catalysts for low temperature CO oxidation." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270939.

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9

Conte, Marco. "Heterogeneous gold and vanadium based catalysts for hydrochlorination and oxidation reactions." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/56150/.

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The first examples of gold as the catalyst of choice were the hydrochlorination of acetylene using gold on carbon catalysts and the oxidation of carbon monoxide, both identified around 20 years ago. From that time most research interest has been focused on the use of gold as a catalyst for oxidation reactions, whereas although gold can be an excellent electrophilic agent is some of its oxidation states, few studies are available which display this. Chlorinated organic compounds are widely manufactured in industry for the production of chemicals that can be used as solvents, glues, anaesthetics
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10

Indar, Devon. "Oxidation of alcohols using heterogeneous Au/TiO2 catalysts." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/oxidation-of-alcohols-using-heterogeneous-autio2-catalysts(14601b30-96d8-418b-bfb8-107d25490249).html.

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This report summarises the work done on monohydroxy aliphatic alcohol upgrading using Au/TiO2 catalysis. The catalysts were initially tested using a plug-flow CO oxidation reactor; complete conversion of a stream of CO flowing over the catalyst bed at a GHSV of approximately 79,500 hr-1 was typically achieved without any required external heating. TEM analysis showed that the freshly prepared catalyst does not contain detectable Aunano clusters, while the spent CO oxidation catalyst had clearly visible nanoparticles with an average size of approximately 1.6 nm. XRD analyses showed that the fin
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11

Saiman, Mohd Izham Bin. "Heterogeneous gold and palladium based catalysts for solvent-free oxidation of toluene." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/35776/.

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Catalyzed oxidation of aromatic hydrocarbons with molecular oxygen has been studied for several decades. For example, toluene can be converted into oxidation products such as benzyl alcohol, benzaldehyde, benzoic acid and benzyl benzoate. At present, the principal industrial production of benzoic acid via the oxidation of toluene involves the use of homogeneous cobalt catalysts in an air pressurized aqueous acetic acid mixture in the presence of Mn ions. However, the use of solvent causes difficulties in the separation of catalysts and products, equipment corrosion, and due to the environmenta
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12

Ryabenkova, Yulia. "Selective oxidation of 1,2-propanediol over gold, palladium and platinum heterogeneous catalysts." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55129/.

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Biodiesel is one of the most commonly used non petroleum-derived fuels in modem society. Glycerol, a by-product from bio-diesel manufacture, is an excellent starting material for the production of 1,2-propanediol by catalytic hydrogenolysis, which can be further oxidized to lactic acid - a major platform molecule which is used in the manufacturing of biodegradable polymers, food additives and moisturizing agents. Lactic acid can be produced by several routes, which are non-green and require the use of toxic and corrosive reagents, such as acetaldehyde and lactonitrile, as well as high-pressure
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13

Xu, Yi-Jun. "Selective oxidation of hydrocarbons using supported gold, silver, copper and bimetallic catalysts." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/54322/.

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Supported gold catalysts can provide tuneable activity for liquid phase selective oxidation of alkenes, in particular cyclohexene and cis-cyclooctene, using molecular oxygen from air under mild conditions. Selective oxidation can be readily kick-started using a nano-crystalline gold catalyst supported on carbon along with a small amount of TBHP as initiator. Extremely high selectivity, ca. 98%, for partial oxidation products with significant conversion has been obtained using a bismuth-modified gold catalyst for selective oxidation of cyclohexene. In the case of cis-cyclooctene oxidation, high
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14

Douthwaite, John. "The selective oxidation of bio-derived platform chemicals over supported gold catalysts." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/93926/.

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A fundamental limitation effecting the exploitation of bio-fuels is that they are not currently economically competitive with conventional fossil fuels. The development of novel chemical processes to convert bi-products from these reactions into high value chemicals could be one method to reduce the economic deficit between these two industries. Glycerol and furfural are produced as bi-products in the production of 1st and 2nd generation bio-fuels. This thesis explores the potential of using supported Au catalysts for the oxidation of these bio-derived compounds for the synthesis of high value
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15

Morad, Moataz. "Development of new highly active nano gold catalysts for selective oxidation reactions." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/59979/.

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Gold catalysts have been found to be efficient for many oxidation reactions. The performance of these catalysts depends strongly on the particle size of the Au nanoparticles. However, other factors also have a strong influence on the catalytic activity such as the preparation method and choice of support. The effect of support and the preparation methods has been investigated with regard to the selectivity and the activity of Au catalysts. The disproportionation of benzyl alcohol has been identified as a source of toluene formation in the solvent free oxidation of benzyl alcohol using supporte
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16

Ab, Rahim Mohd Hasbi. "Heterogeneous gold, palladium and copper based catalysts for liquid phase oxidation of methane." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55125/.

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The oxidation of lower alkanes especially methane to methanol under mild reaction conditions is one of the most challenging task for industry and academia. At present, indirect utilisation via synthesis gas is the only commercially viable process for methanol production. Therefore, this study intends to investigate the direct oxidation of methane to methanol using a novel low temperature approach. Recently, gold based supported catalysts have been found to be highly effective oxidation catalysts where a number of important discoveries have been made such as in hydrogen peroxide synthesis and s
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17

Al-Sayari, Saleh Abdullah. "Synthesis of active supported gold catalysts for CO oxidation and light alkane activation." Thesis, Cardiff University, 2006. http://orca.cf.ac.uk/56051/.

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The preparation of gold catalysts supported on different metal oxides such as ZnO and Fe2O3, using two coprecipitation methods is investigated to determine important factors, such as selection of support material and preparation method, and preparation parameters, such as preparation temperature, pH, and ageing process. These factors control the synthesis of high activity catalysts for the oxidation of carbon monoxide at ambient temperature. The two preparation methods differ in the manner in which the pH is controlled during coprecipitation, either constant pH throughout or variable pH in whi
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18

Abis, Laura. "Gold and gold-palladium catalysts synthesized by a modified sol-immobilisation method for thermal and plasmonic glycerol oxidation." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/114039/.

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The common thread of this PhD Thesis is the use of sol-immobilised noble metal nanoparticles prepared by a novel synthetic route, where the addition of the stabilising agent has been avoided. The first part of the Thesis presents the development of a novel sol-immobilisation route without the addition of stabilisers (e.g., PVA, PVP). A monometallic 1% wt Au/TiO2 and a bimetallic 1% wt AuPd/TiO2 catalysts were prepared and extensively characterised by different techniques in order to gain information including metal loading, nanoparticles morphology and oxidation state of the metals. It has bee
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19

Ballarini, Filippo. "Synthesis and characterisation of electrospun gold on ceria catalysts." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23192/.

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Cerium oxide in catalysis can be used both as support and as a catalyst itself. Ceria catalyses many oxidations reactions, its excellent catalytic properties are due to its store oxygen storage capacity (OSC) and the reticular defects present on its surface. Different morphologies expose different reticular planes, and different reticular planes can expose different amounts of defects. The preparation method of cerium oxide can influence the surface area, morphology, and the number of defects in the sample. This work is focused on different preparation methods for gold nanoparticles supported
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20

Garcia, Soto Carolina Alejandra. "Investigation of gold-based catalysts for liquid phase oxidation of glucose to glucaric acid." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18623/.

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Glucaric acid (GA) is one of the building block chemicals derived from sugar biomass with higher added value. Nowadays, GA is produced by oxidation of glucose (Glu) with either stoichiometric oxidants (HNO3), or by means of electrochemical or biochemical synthesis. However, these processes show drawbacks from either the environmental or economic viewpoint. For this reason, gold nanoparticles (Au NPs) supported on activated carbon (AC) have been studied as catalysts for the oxidation of Glu, using O2 as oxidant in the presence of a base. Using sol immobilization technique, Au NPs have been supp
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21

Yan, Zhen. "Model catalytic studies of single crystal, polycrystalline metal, and supported catalysts." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2455.

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22

Duggan, Michael J. "The use of isotopic oxygen exchange to investigate carbon monoxide oxidation over supported gold catalysts." Thesis, Nottingham Trent University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271214.

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23

Case, Jennifer Margaret. "Gold catalysts prepared by ion exchange for use in ethylene glycol oxidation: An exploratory study." Thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5362.

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Heterogeneous catalysis using supported gold nanocrystallites has attracted increasing attention over the last two decades for its applicability to a wide range of reactions, offering activity under ambient conditions, as well as high selectivities towards particular products. This study focuses on a relatively uncommon method of gold catalyst preparation, ion exchange, which involves the suspension of the support in a solution containing cationic or anionic gold complex precursors at a fixed pH, followed by separation of the solid catalyst from this solution, drying and calcination. Theoretic
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24

Qiu, Yongfu. "Preparation and characterization of nano-gold catalysts supported on ceria-based materials for carbon monoxide and benzene complete oxidation." HKBU Institutional Repository, 2005. http://repository.hkbu.edu.hk/etd_ra/626.

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25

Schubert, Markus Matthias. "Mechanistic insights into the preferential CO oxidation in H 2-rich gas (PROX) over supported noble metal catalysts." Ulm : Universität Ulm, Fakultät für Naturwissenschaften, 2000. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB8541392.

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26

Roselli, Alessandra. "Insight on the factors influencing the selective oxidation of furfural to furoic acid on heterogeneous catalysts." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15678/.

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The aim of this project was to study the factors influencing furfural selective oxidation to 2-furoic acid, specially the influence of the acidic-basic properties of the supports used. The research was focalized to work in a base-free system and without the utilization of any organic solvent. The oxidation reactions were conducted in green conditions, using water as solvent, oxygen to oxidize and gold heterogeneous catalysts. In details, different gold catalysts were prepared and tested in the base-free system. The aim of our research project was firstly to produce 2-furoic acid with very high
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27

Bracey, Charlotte Louise. "An investigation into the structure and activity of monometallic and bimetallic copper and gold catalysts for propene oxidation." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/39198/.

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CuAu/SiO2 catalysts were prepared in a number of ways, the main route being incipient wetness impregnation, but other methods, like deposition precipitation and high dispersion, were also used. Bimetallic and monometallic catalysts were prepared for this investigation and most were characterised by various techniques such as XRD, SEM, TPR, BET, UV visible and TEM. Theoretical and characterisation studies of CuAu catalysts have generated considerable interest. However, little research has been carried out on their catalytic activity. Therefore, propene oxidation was chosen as the principal reac
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28

Gutierrez, Luis Felipe. "Production of lactobionic acid by oxidation of lactose over gold catalysts supported on mesoporous silicas - Reaction optimization and purification process proposal." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29991/29991.pdf.

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Le surplus mondial et le faible prix du lactose ont attiré l’attention de chercheurs et de l’industrie pour développer des procédés novateurs pour la production de dérivés du lactose à valeur ajoutée, tels que l’acide lactobionique (ALB), qui est un produit à haute valeur ajoutée obtenu par l’oxydation du lactose, avec d’excellentes propriétés pour des applications dans les industries alimentaire et pharmaceutique. Des recherches sur la production d’ALB via l’oxydation catalytique du lactose avec des catalyseurs à base de palladium et de palladium-bismuth, ont montré des bonnes conversions et
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29

Dodekatos, Georgios [Verfasser], Harun [Gutachter] Tüysüz, and Ferdi [Gutachter] Schüth. "Copper-cobalt-based catalysts and gold/titania nanostructures for thermocatalytic and surface plasmon-assisted glycerol oxidation / Georgios Dodekatos ; Gutachter: Harun Tüysüz, Ferdi Schüth." Bochum : Ruhr-Universität Bochum, 2017. http://d-nb.info/1144613639/34.

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30

Maumau, Rebecca. "Synthesis of binary and ternary Pd-based Nanocatalysts for alcohol oxidation in alkaline media for fuel cell application." University of the Western Cape, 2020. http://hdl.handle.net/11394/7731.

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>Magister Scientiae - MSc<br>This study explores the use of UV-assisted reduction method to synthesise the catalysts, aiming at reducing synthesis time. The Pd and Au catalyst loading is kept at 5 wt% in order to reduce the cost associated with high loading (20 wt%) of platinum group metals. The synthesised catalysts have SnO2 incorporated in them for two purposes, one being to activate the chemical reaction by absorbing UV-light and the second one is to serve as a promoter for binary and ternary catalysts. All the synthesised electrocatalysts in this study were denoted as Au/10wt%SnO2-C, Au/1
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31

Jonke, Alex P. "Atomic metal/polyaniline composites." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49070.

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It is ideal to theoretically predict the activity of a catalyst. It has been recognized that not only the type of metal, but also its atomic size plays an important role in catalysis. In the past, atomic clusters have been created by sputtering from a sacrificial metal plate and then using a mass selector to choose cluster sizes from 1-233 atoms of gold. This approach has practical limitations. In this thesis, I describe a procedure by which atomic clusters of gold containing 1-8 atoms are deposited in polyaniline as an isolation matrix. My atomic deposition follows a cyclic pathway. Atom
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32

Schilling, Christian Michael [Verfasser], Christian [Akademischer Betreuer] Hess, Rolf [Akademischer Betreuer] Schäfer, and Rolf Jürgen [Akademischer Betreuer] Behm. "Operando Spectroscopy and DFT Modeling of Gold/Ceria Catalysts for CO Oxidation and Water-Gas Shift Reaction / Christian Michael Schilling ; Christian Hess, Rolf Schäfer, Rolf Jürgen Behm." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/1163013528/34.

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33

Ball, Liam Thomas. "Oxidative gold catalysis." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.649363.

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The utility of aryltrimethylsilanes 1 as coupling partners in oxidative gold catalysis has been established through the development of first- and second-generation methodologies for alkene oxyarylation, and through the realisation of a protocol for the direct arylation of simple arenes. Oxidative oxyarylation of mono-substituted olefins 2 is achieved in the presence of a commercially-available precatalyst, Ph3P AuCl and a fluoronium oxidant, Selectfluor. The net addition of an O-nuc leophile and a silane-derived aryl moiety across the C=C double bond affords the conesponding homo benzylic alco
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34

Alshammari, Hamed M. "Oxidation catalysis using supported gold nanocrystals." Thesis, Cardiff University, 2013. http://orca.cf.ac.uk/46238/.

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Oxidation is a key process for commercial applications, in the production of chemical intermediates, high tonnage commodity chemicals, high value fine chemicals, agrochemicals and pharmaceuticals. These oxidations often use stoichiometric oxygen donors such as chromate or permanganate, oxygen donors that give rise to pollutants of considerable environmental concern. Free solvent oxidation of 1-hexene with air using supported gold catalysts with a catalytic amount of tert-butyl hydroperoxide (TBHP) as initiator has been conducted in the liquid phase. Reaction conditions such as radical initiato
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35

Robinson, Matthew Peter. "Ortho-substituted arylsilanes in oxidative gold catalysis." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31394.

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Organometallic compounds derived from tin, boron, and zinc, have been used extensively in transition metal-catalysed cross-coupling, and continue to hold status as the go-to reagents to form new carbon-carbon bonds. Recently, organosilicon compounds have emerged as an attractive alternative to these established reagents, benefitting from low toxicity, low cost, and general ease of handling. While the fundamental reactivity of arylsilane reagents (Ar-SiR3) is well known, their role in transition metal-catalysed reactions is generally less well studied. This thesis comprises an investigation int
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36

Miedziak, Peter. "Selective oxidation reactions catalysed by gold." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/54878/.

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The oxidation of benzyl alcohol over supported gold, palladium and gold palladium catalysts was studied in a high-pressure stirred autoclave. Reaction conditions such as oxygen pressure and reaction temperature were varied to obtain optimum conditions for catalyst screening. Gold palladium catalysts supported on various oxides were prepared and screened with titania supported catalysts proving to be the most active. Different preparation methodologies were used to prepare titania supported bi-metallic catalysts, co-deposition precipitation methodology was found to give the most active and stab
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37

Miller, Duane D. "In Situ Infrared Spectroscopy Study of Gold Oxidation Catalysis." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1152205534.

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38

Musharah, Amani. "Gold-catalysed oxidation of lignin-derived building blocks." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/goldcatalysed-oxidation-of-ligninderived-building-blocks(ef60feb6-5bc8-40c8-95c9-eddd3175f8d1).html.

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The use of heterogeneous catalysts containing Au nanoparticles supported on TiO2 has been explored for oxidative aqueous phase transformations of sustainable phenolic and benzoic acid derivatives that can be obtained from lignin. Au/TiO2 catalysts were chosen because of their high activity for ambient pressure oxidations of gas phase species, and because their synthesis is facile and reproducible through a modified deposition-precipitation method. The aerobic oxidation of syringic, vanillic, and ferulic acid as well as of guaiacol, eugenol and anisole was investigated at temperatures up to 70°
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39

Donoeva, Baira. "Study of catalytic and biological activity of gold-containing metal nanoparticles." Thesis, University of Canterbury. Chemistry, 2014. http://hdl.handle.net/10092/9761.

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Small particles of gold (< 100 nm) have attracted great interest among researchers due to the unique combination of their physicochemical properties. Among various research areas catalysis and bio-nanotechnology represent the largest areas of growth for gold nanoparticle research. Catalysts play a crucial role in the life of the modern society. More than 85 % of all chemical processes are catalytic, and this number is increasing every year. There is a constant demand to develop more efficient and durable catalysts in order to address increasing energy demands and environmental requirements. Th
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40

Morgan, Michelle Marie. "Oxidation of mercury in flue gas streams via gold catalysis." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.677959.

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Mercury emission from coal-fired power plants is a global problem that has garnered attention due to regulations limiting the emission from anthropogenic sources. The three forms of mercury that are all emitted include: elemental mercury (HgO), oxidized mercury (Hg2+), which can both then form particulate mercury. Since current HgO removal technology is not effective, and HgO is extremely toxic, new catalytic solutions are necessary to allow complete oxidation of HgO. The aim of the project was to understand the mechanism of heterogeneous catalyzed mercury oxidation from simulated flue gas str
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41

Chaturvedula, Sumana. "Gold catalysis for selective oxidation for application to bio-derived substrates." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14614.

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The depletion of fossil resources, the volatility of the oil price market and the urgency to mitigate the effects of climate change have pushed the development in chemical industry for sustainable, energy efficient and economic processes for fine chemical production. Selective oxidation of alcohols using noble metal catalysts is a key catalytic conversion for the production of carbonylic and carboxylic compounds for the chemical, pharmaceutical, automobile or consumer goods industry. Gold based catalysts, in particular, have demonstrated superior performance over commonly employed catalysts or
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42

Slazus, Ene. "Dendrimer encapsulated gold nanoparticles as catalyst precursors for oxidative transformations of unsaturated hydrocarbons." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96790.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: In an attempt to produce active catalysts for the oxidation of alkanes, hydrophobic dendritic micelle encapsulated gold nanoparticles were prepared. Dendrimers are well suited as templates for the encapsulation of metal nanoparticles as they can control the size and distribution of the particles. Using hydrophobic dendritic micelles it was found that the mode of encapsulation is driven by the solubility of the metal ions and not complexation of these ions, as is the case with conventional dendrimers. The dendritic micelles
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43

Siler, Cassandra Grace Freyschlag. "Fundamental Studies of Selective Oxidation Reactions on Gold and Silver Surfaces." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13064964.

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This thesis explores the fundamental chemistry of selective oxidation reactions on gold and silver surfaces, developing a predictive framework for oxidative catalysis, which is crucial for rational design of catalytic systems. We begin with an introduction covering the history of precious metal catalyst development, with emphasis on the roles of silver and gold (Chapter 1). Next, we explore selectivity control for oxidative reactions on gold. Specifically, we address the role of coadsorbed oxygen with respect to stability and selectivity control in the reaction of adsorbed acetate (Chapters 2
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44

Rodrigues, Alves Maria Leonor. "Synthesis and characterisation of gold nanoclusters for catalysis applications." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/145398.

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Esta tesis doctoral trata sobre la síntesis, y el estudio de la actividad catalítica de partículas de oro de tamaño inferior a 2 nm, nanoclústers de oro. El interés proviene de la actividad catalítica a temperatura ambiente que tiene el oro cuando las dimensiones son inferiores a aproximadamente los 5 nm. En esta tesis se desarrollan dos métodos de síntesis que permiten obtener clústeres de oro estables con un tamaño de partícula bien definido. En un método se sintetizan nanoclústeres de oro de tamaño inferior a 2 nm, los cuales son posteriormente depositados sobre un soporte. En cambio, el
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45

Guillois, Kevin. "Études des mécanismes d’oxydations aérobies des hydrocarbures lourds catalysées par les nanoparticules d’or." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10054.

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L’objectif de ce travail est de proposer un mécanisme réactionnel pour l’oxydation aérobie d’hydrocarbures lourds, alcanes et alcènes, catalysée par les nanoparticules d’or. La co-oxydation du stilbène et du méthylcyclohexane est utilisée comme réaction modèle afin de comprendre les nombreux mécanismes mis en jeu. Le criblage initial d’une large gamme de catalyseurs d’or nous permet de mettre en évidence des effets de support dans cette réaction et d’établir un cahier des charges bien défini pour l’élaboration d’un catalyseur de référence. Une méthode chimique simple est mise au point pour pré
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Huang, Xiaohua. "Gold Nanoparticles Used in Cancer Cell Diagnostics, Selective Photothermal Therapy and Catalysis of NADH Oxidation Reaction." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10565.

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Gold nanoparticles strongly absorb and scatter visible and near infrared light because of the strongly enhanced electric fields at the surface. This provides the potential of designing novel optically active reagents for simultaneous molecular imaging and photothermal cancer therapy. In this thesis, gold nanospheres and nanorods conjugated with anti-epidermal growth factor receptor (anti-EGFR) antibodies that specifically target EGFR on the cell surface are shown to be used for dual diagnostics and therapy. Using micro-absorption spectroscopy and light scattering imaging, cancerous (HOC 313 an
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López, Auséns Javier Tirso. "From Quantum Mechanics to Catalysis: Studies on the oxidation of alkanes by gold and metal oxides." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/76806.

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This dissertation focuses on the assessment and development of heterogeneous catalysts for the deperoxidation of cyclohexyl hydroperoxide and oxidation of cyclohexane, which will be based in metal oxides and gold nanoparticles. For this endeavour a multidisciplinary approach will be used combining theoretical chemistry, kinetic studies and synthesis and characterisation of materials. The starting choice for the catalyst to carry out the process is supported gold nanoparticles. The approach of this dissertation is to first model the mecha- nism of cyclohexyl hydroperoxide decomposition and oxid
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Grayson, Benjamin Alan. "Application and modeling of TiO2-supported gold nanoparticles for CO preferential oxidation in excess hydrogen." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002131.

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Emerson, Sean Christian. "Synthesis of Nanometer-size Inorganic Materials for the Examination of Particle Size Effects on Heterogeneous Catalysis." Digital WPI, 2000. https://digitalcommons.wpi.edu/etd-dissertations/253.

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The effect of acoustic and hydrodynamic cavitation on the precipitation of inorganic catalytic materials was investigated. The overall objective was to understand the fundamental factors involved in synthesizing nanometer-size catalytic materials in the 1-10 nm range in a cavitating field. Materials with grain sizes in this range have been associated with enhanced catalytic activity compared to larger grain size materials. A new chemical approach was used to produce titania supported gold by coprecipitation with higher gold yields compared to other synthesis methods. Using this approach, it wa
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Hopkinson, Matthew Neil. "Transition metal catalysis in the presence of fluorinating reagents." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:4f29607a-7aad-473b-aabc-af320ea2b1e5.

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In this thesis, the effect of fluorinating reagents on a selection of transition metal-mediated organic transformations was investigated. The first four chapters are focused on gold-catalysed nucleophilic addition processes performed in the presence of “F⁺” sources. Chapter 1 provides a general introduction to homogeneous gold catalysis and summarises the aims and objectives of the project. The effect of the electrophilic fluorinating reagent Selectfluor (82) on the gold-catalysed rearrangement of propargyl acetates 85 is discussed in Chapter 2. α-Fluoroenones 92 resulting from fluorodeacetyla
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