Low-temperature Oxidation Of Methane On Pd-sn/zro2 Catalysts

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Pd/ZrO2, Pd-Sn/ZrO2 and Sn/ZrO2 were prepared by incipient wetness using Pd(NO3)(2)center dot XH2O and SnC4H4O6 center dot XH2O as precursors, dried and calcined in static air at 500 degrees C, 800 degrees C or 1100 degrees C. The influence of Sn species in the oxygen storage capacity of the catalysts, distribution of Pd particle sizes and CH4 oxidation reaction were investigated. Pd particle size was larger on Sn-containing catalysts and showed lower mobility than those in the absence of Sn. Sn oxide species act as an oxygen reservoir that are easily transferred to Pd surfaces promoting the oxidation reaction of methane. For Pd-Sn-containing solids calcined at 1100 degrees C, the contribution of Sn in the CH4 oxidation reaction is negligible. (C) 2015 Published by Elsevier B.V.411117127Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Preparation, structural characterization and catalytic properties of Co/CeO2 catalysts for the steam reforming of ethanol and hydrogen production

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)In this paper, Co/CeO2 catalysts, with different cobalt contents were prepared by the polymeric precursor method and were evaluated for the steam reforming of ethanol. The catalysts were characterized by N-2 physisorption (BET method), X-ray diffraction (XRD), UV-visible diffuse reflectance, temperature programmed reduction analysis (TPR) and field emission scanning electron microscopy (FEG-SEM). It was observed that the catalytic behavior could be influenced by the experimental conditions and the nature of the catalyst employed. Physical-chemical characterizations revealed that the cobalt content of the catalyst influences the metal-support interaction which results in distinct catalyst performances. The catalyst with the highest cobalt content showed the best performance among the catalysts tested, exhibiting complete ethanol conversion, hydrogen selectivity close to 66% and good stability at a reaction temperature of 600 degrees C. (c) 2012 Elsevier B.V. All rights reserved.216281289Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)FAPEMIGFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq