Bimetallic Catalyst
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Bimetallic Au-Pd/α-MoO3 Catalyst with High Oxygen Vacancies for Selective Oxidation of Cinnamyl Alcohol
Supported Au-Pd nanoparticles (NPs) have been extensively studied in alcohol oxidation reactions. However, few studies use reducible metal oxides as support, which can activate oxygen molecules and boost the selectivity of the reaction. In this work, Au-Pd NPs were supported on α-MoO3 and evaluated in the selective oxidation of cinnamyl alcohol without solv
Journal of the Brazilian Chemical Society. Publicado em: 2023
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2. Screening of the Au:Pt Atomic Ratio Supported in SrCO3: Effects on the Performance of the Solvent-Free Oxidation of Benzyl Alcohol
We have prepared, by a sol-immobilization method, bimetallic catalysts with different Au:Pt atomic ratios supported on commercial SrCO3. The catalytic performance for the oxidation reaction of benzyl alcohol of such materials was compared to the monometallic counterparts, aiming at the obtaining of the best composition of the material. It was found that the
J. Braz. Chem. Soc.. Publicado em: 2020-03
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3. NANOPARTICLES OF TUNGSTEN AS LOW-COST MONOMETALLIC CATALYST FOR SELECTIVE HYDROGENATION OF 3-HEXYNE
Low-cost tungsten monometallic catalysts containing variable amounts of metal (4.5, 7.1 and 8.5%W) were prepared by impregnating alumina with ammonium metatungstate as an inexpensive precursor. The catalysts were characterized using ICP, XPS, XRD, TPR and hydrogen chemisorption. These techniques revealed mainly WO3-Al2O3 (W6+) species on the surface. The eff
Quím. Nova. Publicado em: 2016-01
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4. Selective Hydrogenolysis of Glycerol to 1,2-Propanediol Over Bimetallic Cu-Ni Catalysts Supported on γ-Al2O3
A series of Cu or Ni monometallic and Cu-Ni bimetallic catalysts supported on γ-Al2O3 were synthesized by incipient wetness impregnation method. X-ray diffraction results exhibited the formation of bimetallic Cu-Ni phase in the reduced Cu-Ni(1:1)/γ-Al2O3 catalyst. Among the catalyst examined for hydrogenolysis
J. Braz. Chem. Soc.. Publicado em: 2015-08
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5. Determination of Metal Loading in Heterogeneous Catalyst by Slurry Sampling Flame Atomic Absorption Spectrometry
Quantification of metal loading in supported catalysts is imperative; however, the analytical methods are usually time-consuming, expensive, and require sophisticated equipment and sample extraction with hazardous and corrosive strong acids. Herein, we report a new method for quantification of metal in supported catalysts using slurry sampling flame atomic a
J. Braz. Chem. Soc.. Publicado em: 2015-02
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6. Catalisadores bimetálicos de Co e Ni aplicados à reforma à vapor do etanol: propriedades de oxiredução na resistência à deposição de carbono
O efeito da variação da composição cobalto (Co)/níquel (Ni) em catalisadores à base destes metais de transição foi avaliado focando principalmente nas propriedades de oxirredução e sua relação com a deposição de carbono na reação de Reforma a Vapor do Etanol (RVE). Os catalisadores, com teor metálico de 15 e 8 % em massa, foram preparados po
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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7. Influence of ni addition to a low-loaded palladium catalyst on the selective hydrogenation of 1-heptyne
Semi-hydrogenation of alkynes has industrial and academic relevance on a large scale. To increase the activity, selectivity and lifetime of monometallic catalysts, the development of bimetallic catalysts has been investigated. 1-Heptyne hydrogenation over low-loaded Pd and Ni monometallic and PdNi bimetallic catalysts was studied in liquid phase at mild cond
Química Nova. Publicado em: 2010
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8. Avaliação de catalisadores a base de carbeto e nitreto de molibdênio na obtenção de lactitol via hidrogenação da lactose / Avaliação de catalisadores a base de carbeto e nitreto de molibdênio na obtenção de lactitol via hidrogenação da lactose
Seeking a greater appreciation of cheese whey was developed to process the hydrogenation of lactose for the production of lactitol, a polyol with high added value, using the catalyst Ni / activated carbon (15% and 20% nickel), the nitride Mo2N, the bimetallic carbide Ni-Mo/ activated carbon and carbide Mo2C. After synthesis, the prepared catalysts were analy
Publicado em: 2010
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9. Estudo do desempenho e degradação de catalisadores e membranas em células a combustível de eletrólito polimérico / A performance and degradation study of catalysts and membranes for proton exchange fuel cell
In this work, the oxygen reduction reaction (ORR) was studied on nano-particulated Pt and PtM (M = Co, Cr, Fe e Ni) alloy electrocatalysts supported on carbon, prepared by an impregnation method, for utilization on polymer electrolyte fuel cell (PEFC). The physical properties of the materials have been investigated by energy dispersive X-ray analyses (EDX),
Publicado em: 2009
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10. Preparación electroquímica de electrodos bimetálicos PtRu soportados sobre sustratos carbonosos y su caracterización para la oxidación de metanol en medio ácido
In this work the influence of the electrochemical oxidation of different carbon substrates, such as glassy carbon, graphite cloth, graphite felt, and carbon fiber paper, on the electrodeposition of bimetallic PtRu catalysts was studied. The oxidation of the different substrates prior to the catalyst deposition, leads to remarkable improvement of catalyst dis
Matéria (Rio de Janeiro). Publicado em: 2008-06
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11. Efeito da concentração de irídio sobre as propriedades de catalisadores do tipo Pt-Ge-Ir/Al2O3. / Effect of concentration of iridium on the properties of type catalysts Pt-Ge-Ir/Al2O3.
The effect of iridium content on the activity, selectivity and stability of platinum, germanium and iridium supported in alumina catalysts for oil naphta catalytic reforming was studied in this work. Samples were prepared by the impregnation of the metallic salts (hexachloroplatinic acid, hexachoroiridic acid and germanium chloride) over g-alumina in order t
Publicado em: 2008
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12. Influence of the preparation condition of Pd/TiO2 catalysts for the pentachlorophenol hydrodechlorination / Influencia das condições de preparação sobre o desempenho de catalisadores Pd/TiO2 para a hidrodescloração do pentaclorofenol
Organic-chlorine compounds are chemicals which main characteristic is high toxicity and persistence, both in live organisms and in the environment. Such is the case of pentachlorophenol, used as herbicide and pesticide for harvest protection and as biocide for treating woods and leathers. A very promising treatment method is the catalytic hydrodechlorination
Publicado em: 2007