Tesis sobre el tema "Bimetalic"
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Sengupta, Debasish. "Preparation, characterization of bimetalic nanoparticles soaked on poly -ionic resins and their ctalalytic applications". Thesis, University of North Bengal, 2014. http://ir.nbu.ac.in/handle/123456789/1827.
Texto completoRowe, S. J. "Adsorption studies of simple molecules on metalic, bimetalic and semiconductor interfaces". Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383911.
Texto completoGallo, Irã Borges Coutinho. "Surface structure and electronic properties of carbon supported PdAu nanoparticles and their catalytic behavior toward the oxygen reduction reaction /". Araraquara, 2018. http://hdl.handle.net/11449/153370.
Texto completoBanca: Rodrigo Fernando Costa Marques
Banca: Leandro Martins
Banca: Elisabete Inacio Santiago
Banca: Joelma Perez
Abstract: Carbon supported PdAu nanoparticles with different Au contents (20-50% in atoms) were synthesized using a procedure carried out in a liquid two-phase system. As-prepared materials presented similar average particle diameter (~3nm) with narrow distribution over the carbon support, as shown by Transmission Electronic Microscopy (TEM). The combined data from X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) suggest that nanoparticles had Pd-enriched surfaces and Au-rich interiors. Cyclic Voltammetry (CVs) studies in H2SO4 further reinforced these findings, confirming that the nanoparticle surfaces were enriched with Pd. Moreover, XPS results show that increasing the Au content of PdAu alloys leads to varying amounts of surface-like and bulk-like Pd oxide, with a significant increase of metallic Pd. This result is consistent with data of X-ray Absorption Spectroscopy (XAS) around Pd L3 edge, which revealed that Au promotes an increase in the electronic occupancy of the Pd 4d band. Therefore, this whole set of characterizations suggests that the presence of Au in PdAu nanoalloys decreases the Pd affinity for oxygen, giving Pd a more noble-like character. In addition, the influence of ligand and ensemble effects on electrochemical surface processes, such as oxide formation/reduction, CO oxidation and hydrogen adsorption were also investigated. This was also a necessary step in order to determine the best technique to measure the Electrochemical Active Area (EAA) of... (Complete abstract click electronic access below)
Resumo: Nanopartículas de PdAu suportadas em carbono com diferentes frações de Au (20-50% em átomos) foram sintetizadas em um sistema líquido de duas fases. As nanopartículas preparadas apresentaram diâmetro médio próximo a 3 nm, com uma distribuição homogênea sobre o suporte de carbono, o que foi demonstrado por microscopia eletrônica de transmissão (TEM). O conjunto dos dados coletados por difração de raios X (XRD) e por espetroscopia de fotoelétrons excitados por raios X (XPS) demonstrou que o interior das nanopartículas é enriquecido por Au, enquanto a superfície é mais rica em Pd. A análise por XPS também demonstrou que o aumento da fração de Au nas ligas de PdAu leva a uma variação na fração de diferentes espécies de óxidos de Pd e um aumento na quantidade total de Pd metálico. Este resultado é consistente com aquele obtido por espectroscopia de absorção de raios-X (XAS), realizada na borda L3 do Pd, a qual revelou que o Au promove um preenchimento eletrônico na banda 4d do Pd. Ou seja, a presença do Au parece diminuir a afinidade do Pd pelo oxigênio. Ademais, foram estudados a influência de efeitos eletrônicos e do arranjo superficial de átomos sobre os processos eletroquímicos de formação/redução de óxidos, oxidação de CO adsorvido e adsorção de hidrogênio. Estes estudos também permitiram a determinação da área eletroquímica ativa de Pd. Por meio de todas estas caracterizações foi possível traçar correlações entre a composição no cerne das nanopartículas de PdAu e suas propri... (Resumo completo, clicar acesso eletrônico abaixo)
Doutor
Pereira, Luis Gustavo da Silva. "Avaliação do mecanismo de oxidação de hidrogênio contaminado por monóxido de carbono em células PEMFC contendo catalisadores anódicos baseados em Pt-M/C (M=Ru, Mo, Fe e W)". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-11032010-110241/.
Texto completoThe search for alternative sources of energy is a global trend, and in this context, the fuel cell supplied with hydrogen obtained by biofuels reforming is one of the most promising alternative. However, the performance of proton exchange membrane fuel cells (PEMFC) with Pt-based anode is drastically lowered when using CO-contain hydrogen, as that produced by reform. In this work, the electrocatalysis of CO tolerance and the stability of Pt/C, PtRu/C, PtFe/C, PtMo/C, and PtW/C electrocatalysts at a PEM fuel cell anode has been investigated using single cell polarization and on line electrochemical mass spectrometry (EMS) measurements, and cyclic voltammetry, X-ray diffraction (XRD), and X-ray absorption near edge structure (XANES) analyses of the electrocatalysts. For all bimetallic electrocatalysts, which presented higher CO tolerance, EMS results have shown that the production of CO2 starts at lower hydrogen electrode overpotentials as compared to Pt/C, confirming the occurrence of the so-called bifunctional mechanism. On the other hand, XANES results indicate an increase in the Pt 5d-band vacancies for the bimetallic catalysts, particularly for PtFe/C, this leading to a weakening of the Pt-CO bond, helping to increase the CO tolerance (the so-called electronic effect). For PtMo/C and PtRu/C supplied with H2/CO, the formation of CO2 is observed even when the cell is at open circuit, confirming some elimination of CO by a chemical process, most probably the water gas shift reaction. A decay of the fuel cell performance was observed as a function of the operation time. The causes of degradation during long-term operation were found to be a complex process that involves several parallel mechanisms, including: electrocatalyst loss or redistribution, carbon corrosion, and electrolyte (Nafion®) degradation.
Galhardo, Thalita Soares. "Oxidação de glicerol utilizando catalisadores mono e bimetálicos à base de nanopartículas de Pt, Cu ou Ni suportadas em carvão ativado". reponame:Repositório Institucional da UFABC, 2017.
Buscar texto completoAtmatzakis, Evangelos. "Bimetallic photonic metamaterials". Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/399982/.
Texto completoMorris, James Alan. "Palladium-ruthenium bimetallic cascades". Thesis, University of Leeds, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.405707.
Texto completoMigliaccio, Luca. "Bimetallic catalysts for CO2 electroreduction". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14470/.
Texto completoMerrifeild, Ruth Corrin. "Bimetallic Nanoclusters and Protein Interactions". Thesis, University of Birmingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522011.
Texto completoCooper, Ian Ronald. "Palladium-indium bimetallic cascade processes". Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401087.
Texto completoDavies, S. J. R. "The structure of bimetallic catalysts". Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373245.
Texto completoEnce, Chloe Christine. "Organic Synthesis using Bimetallic Catalysis". BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8397.
Texto completoKühn, Laura. "Bimetallic aerogels for electrocatalytic applications". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-226469.
Texto completoZhu, Chengzhou, Dan Wen, Martin Oschatz, Matthias Holzschuh, Wei Liu, Anne-Kristin Herrmann, Frank Simon, Stefan Kaskel y Alexander Eychmüller. "Kinetically controlled synthesis of PdNi bimetallic porous nanostructures with enhanced electrocatalytic activity". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-208520.
Texto completoBerg, Katja E. "Bimetallic model compounds for artificial photosynthesis /". Stockholm, 1997. http://www.lib.kth.se/abs98/berg0109.pdf.
Texto completoSimpkins, Simon M. E. "Bimetallic organoiron dipoles as NLO materials". Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365015.
Texto completoMacLeod, Norman. "Alloy formation in bimetallic reforming catalysts". Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388553.
Texto completoMcCaffrey, Shaun. "Enantioselective Pd/In bimetallic cascade processes". Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432336.
Texto completoCampbell, Steven Bruce. "Characterisation of bimetallic diesel oxidation catalysts". Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=211242.
Texto completoSchütze, Mike. "Bimetallic Complexes for Cooperative Polymerization Catalysis". Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/11858/00-1735-0000-002E-E4A0-A.
Texto completoJudd, Lawrence. "Bimetallic complexes of meta-substituted phosphinobenzenes". Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/110018/.
Texto completoEliáš, Lumír. "Zavedení a optimalizace linky pro výrobu bimetalických komor do vstřikovacích lisů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227962.
Texto completoHuang, Wei. "Selective hydrogenation on zeolite-supported bimetallic catalysts". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.90 Mb., p. 76, 2005. http://proquest.umi.com/pqdlink?did=1037889271&Fmt=7&clientId=8331&RQT=309&VName=PQD.
Texto completoZhou, Shenghu. "Architecturally controlled bimetallic nanoparticles for heterogeneous catalysis". College Park, Md. : University of Maryland, 2007. http://hdl.handle.net/1903/6722.
Texto completoThesis research directed by: Chemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Beck, Victoria Holly. "Synthesis and characterisation of bimetallic organometallic complexes". Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.403935.
Texto completoMaggini, Simona. "Novel phosphinooxazolines as precursor of bimetallic systems". Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433366.
Texto completoNanada, Swagata. "Bimetallic alkoxides as potential lewis acid catalysts". Thesis, University of Newcastle Upon Tyne, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533694.
Texto completoChiffey, Andrew Francis. "Bimetallic compounds of palladium, platinum and gold". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294602.
Texto completoCambanis, George. "Platinum bimetallic catalysts for fuel cell applications". Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37958.
Texto completoHardeman, David. "Growth of carbon nanotubes using bimetallic catalysts". Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709528.
Texto completoWells, Jordann Ashley Logan Slovenne Denis. "Bimetallic actinide complexes for small molecule activation". Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31167.
Texto completoLuo, Kai. "Spectroscopic characterization of monometallic and bimetallic model catalysts". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1709.
Texto completoRoudgar, Ataollah. "Local reactivity of bimetallic overlayer and cluster systems". [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971640084.
Texto completoScherlin, Freddy. "Synthesis and characterization of bimetallic platinum-thallium compounds". Thesis, Linköping University, The Department of Physics, Chemistry and Biology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15403.
Texto completoThe solid bimetallic compounds TtPt(CN)4(ClO4) and TtPt(CN)4(NO3) have been prepared by reactions between tetracyanoplatinate complex [Pt(CN)4]2- and aqueous solutions of Tl(ClO4)3 and Tl(NO3)3, respectively. The elemental analysis (N, C, H, Tl) of the compound has been carried out. The results of the analysis are reasonably consistent with the above compositions of the compounds. The bimetallic compounds have been characterized by IR and Raman spectroscopy as well as X-ray diffraction. IR and Raman spectra of the Tl-Pt compounds confirm presence of the perchlorate and nitrate counter ions in the solid. The presence of a direct Tl-Pt metal-metal bond in the compounds is confirmed by appearance of a strong vibrational band the low frequency region of the vibrational spectra.
Gjervan, Torbjørn. "Studies of bimetallic particle formation in reforming catalysts". Doctoral thesis, Norwegian University of Science and Technology, Department of Chemical Engineering, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1482.
Texto completoRademacher, Carolin [Verfasser]. "Synthesis and analysis of bimetallic nanoparticles / Carolin Rademacher". Bielefeld : Universitätsbibliothek Bielefeld, 2014. http://d-nb.info/1052627609/34.
Texto completoCollins, Richard. "Bimetallic group 4 complexes as olefin polymerisation catalysts". Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:f6cad6bf-c925-4cda-9797-7b1916f98a0f.
Texto completoPersson, Katarina. "Bimetallic palladium catalysts for catalytic combustion of methane". Licentiate thesis, Stockholm, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-332.
Texto completoSnyder, Brian. "An investigation into bimetallic hollow nanoparticles in catalysis". Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47614.
Texto completoO'Brien, S. D. "The preparation and properties of bimetallic hydrogenation catalysts". Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421011.
Texto completoNuttall, Christopher John. "Bimetallic tris-oxalate magnets : synthesis structure and properties". Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299144.
Texto completoMarshall, Robert. "Preparation of bimetallic catalysts by surface organometallic chemistry". Thesis, Open University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265345.
Texto completoChantry, Ruth L. "Characterising the structure and properties of bimetallic nanoparticles". Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4500/.
Texto completoKhimyak, Tetyana. "New bimetallic clusters - precursors for heterogeneous nano-catalysts". Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620698.
Texto completoWise, Anna MacDonald. "Characterisation of bimetallic alloy and core-shell electrocatalysts". Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/341819/.
Texto completoVan, Aswegen Sivan. "Exploring heterogeneous bimetallic nanoparticle catalysts for sustainable oxidations". Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/415218/.
Texto completoSundavadra, Bharat Viram. "The organometallic chemistry of alkyne-bridged bimetallic complexes". Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/272569.
Texto completoLee, Adam Fraser. "Structural and catalytic properties of bimetallic Pd systems". Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/273061.
Texto completoDylla, Anthony Greg. "Synthesis, characterization and catalytic properties of bimetallic nanoparticles". College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9609.
Texto completoThesis research directed by: Dept. of Chemistry and Biochemistry. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Moon, Il Kweon. "Optical performance of bimetallic mirrors in thermal environments". Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/279805.
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