Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/68135
Type: Artigo de periódico
Title: Gold, palladium and gold-palladium supported on silica catalysts prepared by sol-gel method: synthesis, characterization and catalytic behavior in the ethanol steam reforming
Author: da Silva, AGM
Robles-Dutenhefner, PA
Dias, A
Fajardo, HV
Lovon, ASP
Lovon-Quintana, JJ
Valenca, GP
Abstract: Noble-metal-based catalysts supported on silica (Au/SiO2, Pd/SiO2 and Au-Pd/SiO2) were prepared by the sol-gel method and were evaluated in the steam reforming of ethanol for hydrogen production. The catalysts were characterized by N-2 physisorption (BET/BJH methods), X-ray diffraction, temperature programmed reduction analysis, H-2 chemisorption, atomic absorption spectrophotometry and Raman spectroscopy. The structural characterization of the Au- and Pd-containing catalysts after calcination showed that the solids are predominantly formed by Au-0, Pd-0 and PdO species and was observed that the metallic Pd dispersion diminished in the presence of Au-0. The results revealed that the catalytic behavior could be influenced by the experimental conditions and the nature of the catalyst employed. The Pd/SiO2 catalyst showed the best performance among the catalysts tested at the highest reaction temperature (600 A degrees C) due to the more effective action of the metallic active phase, which covers a greater area in this sample. At this same reaction temperature, the Au-Pd/SiO2 catalyst showed a significant deactivation, probably due to the lower Pd dispersion presented by this catalyst.
Subject: Sol-gel method
Noble metals
Ethanol
Hydrogen
Catalysis
Country: Holanda
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s10971-013-3076-8
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.