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Tesis sobre el tema "Metal-support interactions"

Autor: Grafiati
Publicado: 25 de mayo de 2024
Última modificación: 31 de julio de 2025

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1

Anderson, J. B. F. "Strong metal-support interactions in titania-supported metal catalysts." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372539.

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2

Jungius, Hugo. "Model inverse electro-catalyst investigations of metal support interactions." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/413849/.

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Gold supported titania nano-particle surfaces have been synthesised in order to understand supported electrochemical mechanisms through an inverse catalyst. The catalyst process investigated was the electro-oxidation of CO which is known to be promoted on Au nano-particles on a titania support. Synthesis proceeded via physical vapour deposition (PVD) of titanium onto a gold surface (both polycrystalline and 111 crystal), followed by alloying and oxidation to form discrete particles of titania on the surface, with variations in density of particles achieved by control of the initial titanium co
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3

Mogorosi, Ramoshibidu Patrick. "Metal-support interactions on Fe-based Fischer-Tropsch catalysts." Doctoral thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/5438.

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Includes abstract.<br>Includes bibliographical references.<br>‘Metal support interactions’ is a term used to describe a phenomenon whereby the interaction between the active metal and the support material is strong enough to affect the catalytic activity and selectivity of the active phase. Primarily, there are two theories described in literature to explain the manner in which the development of these interactions alters catalytic behavior in supported catalysts. The first theory is ‘the contact affect’, which is generally associated with partially reducible supports such as TiO2 [Tauster et
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4

Venable, Margaret Hamm. "Syntheses, structures and support interactions of potential metal oxide catalyst precursors." Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/26940.

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5

DEMRI, HARIK OJAMILA, and J. P. HINDERMANN. "Etude des interactions metal-support et metal-promoteur sur des catalyseurs a base de rhodium." Université Louis Pasteur (Strasbourg) (1971-2008), 1992. http://www.theses.fr/1992STR13101.

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Le but du present travail est l'etude des interactions metal-support et metal-promoteur (th, zr, ce, y, na. . . ) dans la reaction co+h#2 sur des catalyseurs au rhodium. L'utilisation combinee de differentes methodes (adsorption, microscopie electronique a transmission (met)), spectroscopie infra-rouge a transformee de fourier (ir-tf), thermodesorption programmee (tpd) et thermoreaction programmee (tpsr) a permis de tirer les conclusions suivantes: la difference de taille des particules metalliques observee par les methodes d'adsorption et par la microscopie electronique montrent qu'une partie
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6

Macheli, Lebohang. "Inverse model systems to investigate metal-support interactions in Fischer-Tropsch catalysis." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30921.

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This thesis aims to gain insight into the effects of metal-support interaction in Co/SiO2 catalysts using an inverse model system by modifying Co3O4 nanocrystallites with silanes (i.e. tetraethoxysilane, trimethyl chlorosilane, triphenyl ethoxysilane). It is postulated that the formation of Co-O-Si will alter the catalytic properties of the cobalt site to which silane is bonded and the adjacent ligand-free sites. The desire is to understand the effects of metal support interactions obtained after reduction of the model system on its performance in FischerTropsch synthesis, which was used as a
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7

Traversaz, Olivier. "Etude des interactions relatives metal-metal et metal-support mises en jeu lors de la preparation de catalyseurs bimetalliques supportes." Paris 6, 1992. http://www.theses.fr/1992PA066621.

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Ce travail a porte sur la preparation de catalyseurs bimetalliques supportes par depot selectif, en solution aqueuse, d'un deuxieme metal present sous forme de sel, sur un premier metal supporte. Les parametres (nature et composition du milieu d'impregnation, ph. . . ) regissant le depot, sur le support d'une part et sur le premier metal d'autre part, ont ete etudies. Les resultats nous ont permis de preparer des catalyseurs palladium-cuivre et platine-cuivre deposes sur des billes d'alumine, en operant en deux etapes : - penetration du cuivre au coeur du grain au moyen d'un agent complexant (
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8

Dyasi, Nontsikelelo. "Model systems for the investigation of metal-support interactions in cobalt based Fischer-Tropsch." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33639.

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The catalyst used plays a pivotal role in the optimization of the Fischer Tropsch (FT) synthesis. Cobalt (Co)-based catalysts have been widely used in low temperature Fischer Tropsch synthesis for the production of longer chain olefins [1]. The interaction between the support and the active metal, Co, has been observed to affect the activity and selectivity of the FT synthesis [2]. In order to investigate metal support interactions independent of other support effects, the inverse method was used in the synthesis of model catalysts [3]. The inverse method mimics the interface bond between the
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9

Neumann, Sarah [Verfasser], Sebastian [Akademischer Betreuer] Kunz, Sebastian [Gutachter] Kunz, and Marcus [Gutachter] Bäumer. "Heterogeneous Catalysis with supported Nanoparticles : Particle Size Effects and Metal-Support Interactions / Sarah Neumann ; Gutachter: Sebastian Kunz, Marcus Bäumer ; Betreuer: Sebastian Kunz." Bremen : Staats- und Universitätsbibliothek Bremen, 2019. http://d-nb.info/1203298927/34.

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10

Spence, Stephanie L. "Tuning the Morphology and Electronic Properties of Single-Crystal LiNi0.5Mn1.5O4-δ". Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/100790.

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The commercialization of lithium-ion batteries has played a pivotal role in the development of consumer electronics and electric vehicles. In recent years, much research has focused on the development and modification of the active materials of electrodes to obtain higher energies for a broader range of applications. High voltage spinel materials including LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4-δ</sub> (LNMO) have been considered as promising cathode materials to address the increasing demands for improved battery performance due to their high operating potential, high energy density, and s
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11

Kähler, Kevin [Verfasser], Martin [Gutachter] Muhler, and Wolfgang [Gutachter] Grünert. "On the role of metal-support interactions in methanol synthesis and oxidation / Kevin Kähler ; Gutachter: Martin Muhler, Wolfgang Grünert ; Fakultät für Chemie und Biochemie." Bochum : Ruhr-Universität Bochum, 2010. http://d-nb.info/1226426336/34.

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12

Steib, Matthias [Verfasser], Johannes A. [Akademischer Betreuer] Lercher, Johannes A. [Gutachter] Lercher, and Harald [Gutachter] Klein. "Dry Reforming of Methane – understanding metal support interactions and evaluation of regeneration protocols / Matthias Steib ; Gutachter: Johannes A. Lercher, Harald Klein ; Betreuer: Johannes A. Lercher." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1153882582/34.

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13

Warczinski, Lisa [Verfasser], Christof [Gutachter] Hättig, Robert [Gutachter] Franke, and Reinhold [Gutachter] Fink. "Computational study of metal-support interactions for carbon-supported palladium nanoparticles / Lisa Warczinski ; Gutachter: Christof Hättig, Robert Franke, Reinhold Fink ; Fakultät für Chemie und Biochemie." Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1233484141/34.

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14

Steib, Matthias Verfasser], Johannes [Akademischer Betreuer] [Lercher, Johannes A. [Gutachter] Lercher, and Harald [Gutachter] Klein. "Dry Reforming of Methane – understanding metal support interactions and evaluation of regeneration protocols / Matthias Steib ; Gutachter: Johannes A. Lercher, Harald Klein ; Betreuer: Johannes A. Lercher." München : Universitätsbibliothek der TU München, 2018. http://d-nb.info/1153882582/34.

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15

Kababji, Ala'a Hamed. "Effects of Diluent Addition and Metal Support Interactions in Heterogeneous Catalysis: SiC/VPO Catalysts for Maleic Anhydride Production and Co/Silica Supported Catalysts for FTS." Scholar Commons, 2009. https://scholarcommons.usf.edu/etd/2035.

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This work begins with an introduction to catalysis focusing on heterogeneous systems and surface science phenomena. A study on the partial oxidation reaction of n-butane to maleic anhydride (MA) is presented in the first part. MA supplies are barely adequate for market requirements due to continued strong demand. Only slight improvement in catalytic performance would be welcome in the industrial community. The vanadium phosphorus oxide (VPO) catalyst was used in this work. The reaction is highly exothermic and the need to properly support the catalyst, not only for good dispersion but adequate
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16

Garcia, de Castro Insua Ricardo Antonio. "Catalyseurs d’hydrotraitement modèles à base du Mo et supportés sur α-Al2O3 : étude sur l’incorporation du cobalt, phosphore et triéthylène glycol par une approche de science de surfaces". Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS145.

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La genèse de la phase active dans les catalyseurs d’hydrotraitement est influencée par la nature du support. Néanmoins, une description à l’échelle moléculaire des interactions métal-support est encore balbutiante dû aux sites de sorption mal définis du support industriel γ-Al2O3. Une approche de science des surfaces en phase aqueuse a contourné cette limitation en utilisant des monocristaux de α-Al2O3 selon 4 orientations : C(0001), A(112 ̅0), M(101 ̅0), et R(11 ̅02) pour étudier la genèse de MoS2 en contrôlant la spéciation des sites de surface. Cette approche a montré que des propriétés de
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17

PENGUILLY, VANESSA DE. "Etude de catalyseurs bimetalliques pt - w supportes sur alumine : vers un suivi moleculaire des interactions metal / support au cours des etapes de la preparation d'un catalyseur a 3 composantes." Paris 6, 1998. http://www.theses.fr/1998PA066587.

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Pour ameliorer les performances du catalyseur classique de reformage pt / al 2o 3-cl, les recherches actuelles s'orientent vers la comprehension exacte des modifications induites sur le platine par l'ajout d'un deuxieme voire d'un troisieme metal. L'etude du systeme pt / alumine modifiee par un depot de tungstene entre dans la lignee de ces etudes. Afin de comprendre et de rationaliser comment le depot initial de tungstates a la surface de l'alumine peut modifier le comportement catalytique du platine metallique, les etapes successives de la preparation d'un catalyseur (impregnation w puis pt,
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18

Gallais, Patrick. "Dépôt de couches minces de tantale par pulvérisation et étude des interactions TA/SIO :(2) et TA/SI à basses températures." Angers, 1987. http://www.theses.fr/1987ANGE0013.

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Analyse par spectrométrie Auger des couches déposées par pulvérisation cathodique sur des substrats de silicium ou d'oxyde de silicium pour des températures comprises entre 50 et 500c. Certains échantillons sont élaborés en bombardant la couche durant sa formation à l'aide d'ions argon du plasma. Etude de la nature chimique des interactions entre TA et SI ou SIO::(2).
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19

Holz, Marie Christine [Verfasser], Martin [Gutachter] Muhler, and Wolfgang [Gutachter] Grünert. "Spectroscopic and kinetic investigations of the oxidation of short-chain alcohols over supported Au catalysts to probe metal-support interactions / Marie Christine Holz ; Gutachter: Martin Muhler, Wolfgang Grünert ; Fakultät für Chemie und Biochemie." Bochum : Ruhr-Universität Bochum, 2013. http://d-nb.info/1223172090/34.

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20

Carrette, Linda Petra Lea. "Characterisation of the strong metal-support interaction (SMSI) in electrocatalysis." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286753.

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21

Dole, Holly. "Connecting Metal-Support Interaction and Electrochemical Promotion Phenomena for Nano-structured Catalysts." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34610.

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Air pollutants can cause poor air quality; however, the use of heterogeneous catalytic oxidation has been shown to be an efficient and cost-effective removal method. Some examples of commercial application of such catalysts include catalytic convertors in automobiles and industrial process exhausts. Research with regards to improving these technologies has included using less-expensive catalyst materials, increasing catalytic performance, and achieving higher efficiency. The concept of metal-support interaction (MSI) is one method of altering catalytic performance through changing the proper
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22

Hajar, 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.

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In heterogeneous catalysis, promoting the activity of the catalytic metals is long known as an important method to make a process more efficient and viable. Noble metals have been promoted classically by a chemical coverage of an ionic solution on the surface of the catalyst or using inert support, e.g., silica or alumina, allowing an increase of the dispersion of the catalyst. Therefore, new methods of promotion needed to be better explored to improve the efficiency of metal and metal oxide catalysts. One way of enhancing the catalyst’s activity is to disperse the noble metal at the nanoscale
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23

Bertella, Francine. "Structural, promotion and metal-support interaction effects in Co/TiO2 catalysts for Fischer-Tropsch synthesis." Doctoral thesis, Universitat Politècnica de València, 2018. http://hdl.handle.net/10251/107952.

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La presente tesis doctoral está centrada en la investigación de los parámetros estructurales que determinan las propiedades catalíticas en la síntesis de Fischer-Tropsch (SFT) de catalizadores de cobalto soportados en TiO2. Por un lado, el estudio de la influencia del polimorfo de óxido de titanio (rutilo vs. anatasa) utilizado como soporte en catalizadores de Co promovidos con Ru ha permitido obtener correlaciones entre la estructura cristalina del soporte, la extensión del efecto SMSI (interacción fuerte metal-soporte) y los resultados catalíticos. Por otro lado, mediante la modificación de
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24

NERY, MONICA PIRES. "THE STUDY OF METAL-SUPPORT INTERACTION ON BARIUM AND CESIUM PROMOTED RUTHENIUM CATALYSTS FOR THE AMMONIA SYNTHESIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6629@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>O processo industrial para a síntese de amônia utiliza um catalisador de ferro triplamente promovido, operando em condições drásticas a temperaturas entre 400 e 700°C e a uma pressão bastante elevada (aproximadamente 300 atm). Novos catalisadores vêm sendo estudados, em substituição ao ferro, para aumentar ainda mais a produção de NH3. A principal vantagem dos catalisadores a base de rutênio é que eles são menos sensíveis à contaminação pela amônia que os catalisadores a base de ferro. O objetivo deste trabalho foi avaliar
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25

Panaritis, Christopher. "Metal-Support Interaction and Electrochemical Promotion of Nano-Structured Catalysts for the Reverse Water Gas Shift Reaction." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/41963.

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The continued release of fossil-fuel derived carbon dioxide (CO₂) emissions into our atmosphere led humanity into a climate and ecological crisis. Converting CO₂ into valuable chemicals and fuels will replace and diminish the need for fossil fuel-derived products. Through the use of a catalyst, CO₂ can be transformed into a commodity chemical by the reverse water gas shift (RWGS) reaction, where CO₂ reacts with renewable hydrogen (H₂) to form carbon monoxide (CO). CO then acts as the source molecule in the Fischer-Tropsch (FT) synthesis to form a range of hydrocarbons to manufacture chemicals
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26

Udumula, Venkata Reddy. "Synthesis, RNA Binding and Antibacterial Studies of 2-DOS Mimetics AND Development of Polymer Supported Nanoparticle Catalysts for Nitroarene and Azide Reduction." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6031.

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Project I 2-Deoxystreptamine (2-DOS), the most conserved central scaffold of aminoglycosides, is known to specifically recognize the 5'-GU-'3 sequence step through highly conserved hydrogen bonds and electrostatic interactions within and without the context of aminoglycosides (Figure 1a). We proposed that a novel monomeric unnatural amino acid building block using 2-DOS as a template would allow us to develop RNA binding molecules with higher affinity and selectivity than those currently available. Conjugating two or more of the monomeric building blocks by an amide bond would introduce extra
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27

Macheli, Lebohang. "Silica modified Co3O4 nanocubes as a model system for metal-support interaction in Co/SiO2 catalyst for Fischer-Tropsch synthesis." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/13226.

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Includes bibliographical references.<br>The aim of this study was to study the interaction between the silica and cobalt crystallites using a model of Co3O4-nanocubes whose surface was modified with tetraethyl orthosilicate. The model systems were prepared in two steps, viz. synthesis of the cobalt(III,II) oxide nanocubes via the sodium dodecylsulphate assisted oxidative precipitation and a surface modification of the nanocubes with tetraethyl orthosilicate. The obtained morphology and in particular the average crystallite size of Co3O4 nanocubes is affected by the temperature at which the rea
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28

BADRI, AHMED. "Caracterisation de la reduction de la cerine par h#2 et co. Interaction metal support dans les catalyseurs pd/ceo#2." Caen, 1995. http://www.theses.fr/1995CAEN2007.

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La reduction d'echantillons de cerine, de differentes textures et surfaces specifiques, a ete suivie par thermogravimetrie et, essentiellement, par spectroscopies d'absorption uv-vis et irtf. L'etat de reduction est spectroscopiquement repere en utilisant: soit des transitions electroniques (ce#3#+-ce#4#+ dans le visible, de ce#3#+ et peut-etre ce#2#+ (excite - ce#3#+ dans l'infrarouge), soit des molecules sondes (especes hydroxyles et methoxy). On montre que la sonde methoxy permet: (i) une mesure de la surface externe de la cerine (reduite ou oxydee), (ii) la caracterisation des lacunes oxyg
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29

Luo, Wen. "Tuning the redox properties of cobalt particles supported on oxides by an In-between graphene layer." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF007/document.

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L'interaction métal-support (MSI) joue un rôle important dans la catalyse hétérogène. La compréhension et la modification du MSI sont des étapes essentielles pour développer catalyseurs de haute performance. Dans cette thèse, un nouveau concept, qu’il s’agit de recouvrir le support l'oxyde avec un revêtement mono-couche de graphène, a été proposé pour modifier le MSI. L'influence de la couche de graphène sur les interactions de métal (Co et Co-Pt) - oxyde (ZnO et SiO2) et sur les propriétés d'oxydo-réduction des particules métalliques ont été évaluées via des systèmes catalytiques de modèle. L
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30

Behafarid, Farzad. "Structure, stability, vibrational, thermodynamic, and catalytic properties of metal nanostructures: size, shape, support, and adsorbate effects." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5121.

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Recent advances in nanoscience and nanotechnology have provided the scientific community with exciting new opportunities to rationally design and fabricate materials at the nanometer scale with drastically different properties as compared to their bulk counterparts. In this dissertation, several challenges have been tackled in aspects related to nanoparticle (NP) synthesis and characterization, allowing us to make homogenous, size- and shape-selected NPs via the use of colloidal chemistry, and to gain in depth understanding of their distinct physical and chemical properties via the synergistic
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31

Law, Yeuk Ting. "Investigation of reaction networks and active sites in ethanol steam reforming reaction over Ni and Co-based catalysts." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00869963.

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Bimetallic catalysts have been widely exploited to improve the performance of various catalytic reactions. Understanding the surface properties and in particular, bimetallic interaction and support effect of the catalytic components is an important step towards rational catalyst design. In this thesis, Ni-Co thin film on polar ZnO single crystal was studied as a model catalyst for ethanol steam reforming reaction. The aim is to provide fundamental understanding of how the surface characteristics of the catalyst influence the mechanism and the efficiency of the reaction. This study focused firs
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32

Fruth, Jana. "Sensitivy analysis and graph-based methods for black-box functions with on application to sheet metal forming." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0779/document.

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Le domaine général de la thèse est l’analyse de sensibilité de fonctions boîte noire. L’analyse de sensibilité étudie comment la variation d’une sortie peut être reliée à la variation des entrées. C’est un outil important dans la construction, l’analyse et l’optimisation des expériences numériques (computer experiments).Nous présentons tout d’abord l’indice d’interaction total, qui est utile pour le criblage d’interactions. Plusieurs méthodes d’estimation sont proposées. Leurs propriétés sont étudiées au plan théorique et par des simulations.Le chapitre suivant concerne l’analyse de sensibilit
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33

Kast, Patrick [Verfasser], Robert [Akademischer Betreuer] Schlögl, Thorsten [Akademischer Betreuer] Ressler, and Martin [Akademischer Betreuer] Muhler. "Structure-function relationship of strong metal-support interaction studied on supported Pd reference catalysts / Patrick Kast. Gutachter: Robert Schlögl ; Thorsten Ressler ; Martin Muhler. Betreuer: Robert Schlögl." Berlin : Technische Universität Berlin, 2015. http://d-nb.info/1072684268/34.

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34

Saoud, Khaled Mohammad Eqab. "Carbon Monoxide Oxidation on Nanoparticle Catalysts and Gas Phase Reactions of Small Molecules and Volatile Organics with Metal Cations." VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1372.

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This dissertation demonstrates the application of a vapor phase method to synthesize supported and unsupported nanoparticle catalysts for CO oxidation. The method is based on the Laser Vaporization/Controlled Condensation (LVCC) technique. The first part of this dissertation presents the vapor phase synthesis and characterization of gold nanoparticles supported on a variety of oxide supports such as CeO2, TiO2, CuO and MgO.The results indicate that Au nanoparticles supported on CeO2 exhibit higher catalytic activity than Au supported on other oxides. The high activity of the Au/CeO2 catalyst i
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35

Zhang, Ke [Verfasser], Hans-Joachim [Akademischer Betreuer] Freund, Hans-Joachim [Gutachter] Freund, and Mario [Gutachter] Dähne. "Scanning tunneling microscopy study of strong metal-support interaction in iron oxide based model catalysts / Ke Zhang ; Gutachter: Hans-Joachim Freund, Mario Dähne ; Betreuer: Hans-Joachim Freund." Berlin : Technische Universität Berlin, 2018. http://d-nb.info/1164076469/34.

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36

FERNANDEZ, J. LASSO. "HYDROGEN PRODUCTION FROM RENEWABLE PRIMARY SOURCES." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/366899.

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ABSTRACT One of the most attracting renewable sources for energy production is bioethanol, which can be obtained from biomass. Special attention is here focused on the steam reforming reaction of ethanol (SRE) in which the principal product, hydrogen, is an interesting energy vector to produce power, electricity and heat. However, the process has not yet come to maturity and it should be optimized in order to made it industrially available. To this aim, we focused our work on catalysts synthesis for SRE, trying to couple high activity and durability. Different catalyst formulations based
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37

Rico, Pérez Verónica. "Optimization of N2O decomposition RhOx/ceria catalysts and design of a high N2-selective deNOx system for diesel vehicles." Doctoral thesis, Universidad de Alicante, 2013. http://hdl.handle.net/10045/35739.

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38

Kikkawa, Soichi. "The Design of Active Sites for Selective Catalytic Conversion of Carbon Dioxide." Doctoral thesis, Kyoto University, 2020. http://hdl.handle.net/2433/253303.

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京都大学<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第22467号<br>工博第4728号<br>新制||工||1738(附属図書館)<br>京都大学大学院工学研究科分子工学専攻<br>(主査)教授 田中 庸裕, 教授 江口 浩一, 教授 佐藤 啓文<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM
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PASQUALE, LEA. "Structural Evolution of PdCu and PtCu Nanocrystal Catalysts over Redox Treatments." Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/973257.

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This thesis presents the main results on the synthesis of PdCu and PtCu bimetallic nanocrystals (NCs) and their application as catalysts for CO oxidation as a probe reaction. Focusing on Cu and keeping constant the NC size and the support material, the role of the noble metal in the alloy/dealloy/migration process of noble metal-Cu alloyed NCs was studied. The role of the support material in the same transformations was also objected of study. NCs with defined size and composition were successfully synthesized by means of colloidal synthesis methods. The NCs were further deposited on a SiO2 su
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40

Wang, Zichun. "Catalytic conversion of biomass- and petrochemical-derived model compounds over acidic catalysts." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/13679.

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Silica-aluminas (SA) as solid acids are widely used in the chemical, food, pharmaceutical and petrochemical and bio-refining industries. Their acidic properties depend on their local structure. For the first time, the presence of large amount of surface available AlV species on amorphous SA (ASA) was revealed by 27Al MQMAS NMR spectroscopy in this thesis. These AlV species can enhance the strength of neighboring SiOH groups evidenced by 1H-27Al D-HETCOR. Indeed, significantly enhancing the acidity of ASA at the same Al loading was achieved via increasing AlV concentration by applying higher co
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41

Ngandjong, Alain Cabrel. "Modélisation structurale des clusters d’alliages supportés : effet du support de silice et effet de taille." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2070/document.

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Les simulations numériques ont négligé jusqu’ici l’influence du support de silice amorphe sur la structure des nanoparticules métalliques déposées car l’interaction métal-silice amorphe est faible. Toutefois les études expérimentales montrent un effet de troncature sur la structure des nanoparticules. L’idée de ce travail a donc été d’étudier l’influence de ce support sur la structure et la morphologie des nanoparticules d’argent au moyen de la modélisation moléculaire (Monte Carlo et dynamique moléculaire). L’objectif de ce travail a été tout d'abord de déterminer le potentiel interatomique p
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42

Xu, Zhenxin. "Development of new macroscopic carbon materials for catalytic applications." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF005/document.

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De nos jours, les matériaux carbonés macroscopiques font face à un nombre croissant d'applications en catalyse, soit en tant que supports, soit directement en tant que catalyseurs sans métal. Cependant, il reste difficile de développer un support de catalyseur hiérarchisé à base de. carbone ou un catalyseur utilisant un procédé de synthèse beaucoup plus simple. À la recherche de nouveaux matériaux carbonés structurés pour la catalyse hétérogène, nous avons exploré le potentiel du feutre de carbone / graphite du commerce (FC / FG). Le but du travail décrit dans cette thèse a été le développemen
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43

Thevenin, Philippe. "Catalytic combustion of methane." Doctoral thesis, KTH, Chemical Engineering and Technology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3402.

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<p>Catalytic combustion is an environmentally benign technologywhich has recently reached the stage of commercialization.Palladium is the catalyst of choice when considering gasturbines fuelled with natural gas because of its superioractivity for methane oxidation. Several fundamental issues arestill open and their understanding would result in animprovement of the technology. Hence, the work presented inthis thesis aims at the identification of some of theparameters which govern the combustion activity ofpalladium-based catalysts.</p><p>The first part of this work gives a background to cataly
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44

Hickel, Probst Sonia Maria. "Propriétés catalytiques et caractérisation de catalyseurs au nickel déposé sur oxydes de terre rare : influence de l'intéraction métal-support." Poitiers, 1989. http://www.theses.fr/1989POIT2296.

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Etude des modifications des proprietes du nickel sur support d'oxydes de terres rares (lanthane et cerium) en comparant avec d'autres supports. Les caracterisations physicochimiques (reduction chimique, adsorption-desorption a temperature programmee) montrent que les oxydes de terres rares sont des supports facilement reductibles. Toutefois les mesures de chimisorption ne permettent pas de determiner la taille des particules en raison d'interactions electroniques entre le metal et le support. C'est pourquoi, les catalyseurs sont caracterises par des reactions d'hydrogenation. Mise en evidence
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45

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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46

Mohotlhoane, Sifiso Alec. "The effect of the presence of species mimicking metal-support interactions adsorbed on a Co(0001) metal surface." Thesis, 2016. http://hdl.handle.net/10539/21752.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of requirements for the degree of Master of Science. Johannesburg, October 2016.<br>The adsorption of molecules on a metal surface is core in heterogeneous catalysis. Surface sensitive techniques such as low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD) are key tools to study adsorption geometries and structures of molecules and atoms on a metal surface. As our first model system we investigated the dissociatio
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47

Mokoloko, Lerato Lydia. "The effect of metal support interactions between a cobalt catalyst and carbon dots (Cdots) in cobalt fischer-tropsch catalysts." Thesis, 2018. https://hdl.handle.net/10539/26174.

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A dissertation submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfillment for the degree of Master of Science in Chemistry. University of the Witwatersrand, Johannesburg, January 2018<br>The aim of this study was to introduce functionalized carbon dots (Cdots) as potential support and reducing agents for cobalt-based Fischer-Tropsch catalysts. Cdots with different physicochemical properties were synthesized from natural-based product such as ascorbic acid, sucrose and chitosan, using microwave-assisted reactions. Two types of Cdots, namely N-free Cdot
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48

Wilde, C. A., Yulia Ryabenkova, I. M. Firth, et al. "Novel rhodium on carbon catalysts for the oxidation of benzyl alcohol to benzaldehyde: A study of the modification of metal/support interactions by acid pre-treatments." 2018. http://hdl.handle.net/10454/17007.

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Yes<br>Rhodium nanoparticles or rhodium organometallic complexes are mainly used in catalysis for reduction or hydroformylation reactions. In this work instead, we explored the capabilities of Rh nanoparticles as an oxidation catalyst, applied to the oxidation of benzyl alcohol to benzaldehyde under very mild conditions (100 °C, and atmospheric pressure) as a model reaction. Here we report the preparation of novel Rh/C catalysts by using an impregnation protocol, with particular emphasis on the pre-treatment of the carbon supports by using HNO3 and HCl, as well as the characterization of these
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49

Lu, Chun-Mei, and 呂春美. "Naphthalene hydrogenation over Pt/TiO2-ZrO2 and the behavior of strong metal-support interaction(SMSI)." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/60637477374980455645.

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博士<br>國立清華大學<br>化學工程學系<br>88<br>Vapor-phase naphthalene hydrogenation over various supported Pt catalysts was studied in a continuous fixed-bed micro-reactor. Experimental results indicated that the catalytic activity of the catalyst strongly depended on the nature of the support and the pre-reduction temperature. Reaction order was independent of the supports as the reaction was pseudo-first-order with respect to naphthalene in the temperature range studied. By comparing the apparent rate constants over various supported Pt catalysts, Pt supported on TiO2-ZrO2(1/1) reduced at a low temperatur
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50

Zhang, Liang 1986. "Theoretical study of correlation between structure and function for nanoparticle catalysts." Thesis, 2014. http://hdl.handle.net/2152/28338.

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The science and technology of catalysis is more important today than at any other time in our history due to the grand energy and environment challenges we are facing. With the explosively growth of computation power nowadays, computer simulation can play an increasingly important role in the design of new catalysts, avoiding the costly trail-and-error attempts and facilitating the development cycle. The goal to inverse design of new materials with desired catalytic property was once far off, but now achievable. The major focus of this dissertation is to find the general rules that govern the
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