Skip navigation
Universidade Federal da Bahia |
Repositório Institucional da UFBA
Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/6051
Tipo: Artigo de Periódico
Título: Novel supports for nickel-based catalysts for the partial oxidation of methane
Título(s) alternativo(s): Catalysis Today
Autor(es): Berrocal, Guillermo José Paternina
Silva, Andre L. M. da
Assaf, José Mansur
Albornoz, Alberto
Varela, Maria do Carmo Rangel Santos
Autor(es): Berrocal, Guillermo José Paternina
Silva, Andre L. M. da
Assaf, José Mansur
Albornoz, Alberto
Varela, Maria do Carmo Rangel Santos
Abstract: Zirconia-supported nickel catalysts with different amounts of aluminum (Al/Zr = 0.2, 1 and 2) were studied in this work in order to find alternative supports for nickel-based catalysts for the partial oxidation of methane. This reaction is a promising route for producing hydrogen and syngas for different applications. Samples were prepared by precipitation and impregnation techniques, characterized by several techniques and evaluated in the partial oxidation of methane in the range of 450–750 °C and 1 atm. It was found that aluminum affects the textural and catalytic properties of zirconia-supported nickel catalysts. The tetragonal phase of zirconia was stabilized by aluminum and gamma-alumina was also found in the aluminum-richest samples. Aluminum increased the porosity and the specific surface area of the solids. The catalytic activity also increased with the amount of aluminum in solids probably due to the stronger interaction of nickel with the support, which slowly generates active sites during the reduction step. The methane conversion and hydrogen selectivity increased with temperature, indicating no deactivation. The hydrogen to carbon monoxide molar ratio decreased due to aluminum but was not significantly affected by temperature. The coke produced was not harmful to the catalysts and aluminum affected its amount, although no simple relationship was found between these parameters. The most promising catalyst was the sample with aluminum to zirconium molar ratio of 2, which showed high activity and hydrogen selectivity and was stable under the reaction condition.
Palavras-chave: Partial oxidation of methane
Syngas
Hydrogen
Zirconia
Nickel
Aluminum
Editora / Evento / Instituição: Elsevier
URI: http://www.repositorio.ufba.br/ri/handle/ri/6051
Data do documento: 2010
Aparece nas coleções:Artigo Publicado em Periódico (Química)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
(49)1-s2.0-S0920586109003307-main.pdf
  Restricted Access
953,55 kBAdobe PDFVisualizar/Abrir Solicitar uma cópia
Mostrar registro completo do item Visualizar estatísticas


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.