Catalytic combustion of methane over double  perovskite Sr2Fe1-xMgxMoO6 mixed oxides

WANG Zhenghong; FENG Shaojie; YANG Pinghua

doi:10.3969/j.issn.0253-2778.2010.04.005

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Catalytic combustion of methane over double perovskite Sr2Fe1-xMgxMoO6 mixed oxides

1.
CAS Key Laboratory of Materials for Energy Conversion, and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
2.
School of Materials & Chemical Engineering, Anhui University of Architecture, Hefei 230022, China

Cite this:

https://doi.org/10.3969/j.issn.0253-2778.2010.04.005

Received Date: 17 February 2009
Rev Recd Date: 08 May 2009
Publish Date: 30 April 2010

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Abstract

Abstract

A series of double perovskite mixed oxide catalysts nominal Sr2Fe1-xMgxMoO6 was prepared with the sol-gel method and the properties of as-synthesized powders were characterized by XRD, BET, XPS, and TG. The catalytic activity of the Sr2Fe1-xMgxMoO6 for catalytic combustion of methane was tested in a pure oxygen atmosphere without dilute gas. The TG curves exhibit a typical two weight-loss processes similar to that of perovskite oxides. The results reveal that the catalytic activity of Sr2Fe1-xMgxMoO6 is affected by Fe/Mg ratio distinctly. It is suggested that substitution Fe ion with Mg results in the order of structure and the decrease of oxygen vacancy concentration on the surface, which is disadvantageous to the catalysis activity of methane combustion.

Abstract

A series of double perovskite mixed oxide catalysts nominal Sr2Fe1-xMgxMoO6 was prepared with the sol-gel method and the properties of as-synthesized powders were characterized by XRD, BET, XPS, and TG. The catalytic activity of the Sr2Fe1-xMgxMoO6 for catalytic combustion of methane was tested in a pure oxygen atmosphere without dilute gas. The TG curves exhibit a typical two weight-loss processes similar to that of perovskite oxides. The results reveal that the catalytic activity of Sr2Fe1-xMgxMoO6 is affected by Fe/Mg ratio distinctly. It is suggested that substitution Fe ion with Mg results in the order of structure and the decrease of oxygen vacancy concentration on the surface, which is disadvantageous to the catalysis activity of methane combustion.