Bimetallic Catalyst
Mostrando 13-20 de 20 artigos, teses e dissertações.
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13. Preparation, characterization, and application of trimetalic catalysts for direct ethanol fuel cells: Pt-Ru-Sn/C / Preparação, caracterização e aplicação de catalisadores trimetálicos para a oxidação de etanol em célula a combustível direta: Pt-Ru-Sn/C
This work aimed at developing a method for the obtention of carbon-supported Pt nanocatalysts modified with Rhutenium and Tin, which were evaluated for ethanol eletrooxidation in direct fuel cells. To obtain these catalysts, we employed the Pechini method, which consists in the decomposition of a polymeric precursor. Many nanocatalysts containing various PtR
Publicado em: 2007
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14. "Dependence of the selectivity of the methanol and ethanol electrooxidation reaction on Pt/C and PtRh/C nanoparticles" / "Dependência da seletividade da reação de eletro-oxidação de metanol e etanol sobre nanopartículas de Pt/C e PtRh/C"
The methanol and ethanol electrooxidation is a subject of intense studies in electrocatalysis. The aim of such attention concerning this alcohol electrooxidation activity is due to development of new energy converter systems more efficient and less pollutant. The electrocatalysis research has been also directed to nanoparticle systems. Metallic particles in
Publicado em: 2005
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15. Estudo da Adição do Promotor Cu aos Catalisadores Pt/Al2O3 e Pt/Nb2O5 para a Oxidação Seletiva de CO / Study of the Addition of Cu Promoter to the Pt/Al2O3 and Pt/Nb2O5 catalysts for the Selective Oxidation of CO
The fuel cells are an alternative to generate energy without polluting the environment. They produce electric energy through the reaction of hydrogen with the oxygen from air. The product of the reaction is water. It is an interesting form of generation energy because its a clean technology. The hydrogen used as combustible for the fuel cells is proceeding f
Publicado em: 2005
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16. Propane oxidation on Pt-WO3/gamma -AL2O3 catalytic systems
The oxidation of propane on was studied with Pt-xWO3/Al2O3 catalysts was studied ,by varying the concentration of tungsten sublayer. Thermal analysis and XRD in situ showed that the enrichment of tungsten at the surface is associated with the formation of HxWO3 bronze. FTIR results with C3H8 and O2 indicated that the catalyst surface properties and the inter
Brazilian Journal of Chemical Engineering. Publicado em: 2003-03
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17. Avaliação do desempenho de catalisadores do tipo Pt-Re-Sn/Al2O3 na reforma de n-octano.
Pt-Re-Sn/Al2O3-Cl catalysts were evaluated in the n-octane reforming to produce aromatics specially xylenes and were compared with the correspondent monometallic(Pt/Al2O3) and bimetallic (Pt-Re and Pt-Sn/Al2O3) ones. The samples were prepared by coimpregnation and successive impregnations of alumina, with the solutions of the metallic precursors. The solids
Publicado em: 2003
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18. Study of catalytics Pt-In/Nb2O5 in the hydrocarbons conversion / Estudo de catalisadores Pt-In/Nb2O5 na conversão de hidrocarbonetos
Hydrocarbon dehydrogenation is an important industrial process, due to the high demand of unsatured hydrocarbons for industrial processes and products. Unsatured hydrocarbons are used in the manufacture of several products, such as detergents, high octanage gasoline, pharmaceutical products and synthetic rubber. The commercial catalysts employed in the hydro
Publicado em: 2003
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19. Effects of Cu over Pd based catalysts supported on silica or niobia
Palladium and palladium-copper catalysts supported on silica and niobia were characterized by H2 chemisorption and H2-O2 titration. Systems over silica were also analyzed by transmission electron microscopy and EXAFS. The metallic dispersion decreased from 20% to 7% when the content of Pd was increased from 0.5wt.-% to 3wt.-% in monometallic catalysts. The a
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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20. Hidrogenação seletiva do citral sobre catalizadores suportados de Ru-Sn
The aim of this work is to study the selective hydrogenation of citral to geraniol and nerol over Ru-Sn based catalysts supported on Ti02 or AI2O3. Some aspects were focused, namely, support; addition of Sn; effect of Sn content and effect of reduction temperature on catalysts supported on T1O2. Futhermore, this work aims to get some information about Sn and
Publicado em: 1999