Low-temperature catalytic combustion of methane over MnOx-CeO2 mixed oxide catalysts: Effect of preparation method

Shi Limin; Wei Chu; Qu Fenfen; LuoShizhong

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Low-temperature catalytic combustion of methane over MnOx-CeO2 mixed oxide catalysts: Effect of preparation method

Shi Limin 1,Wei Chu 2 *,Qu Fenfen 3,LuoShizhong 1

1.School of Chemical Engineering, Sichuan University

2.Sichuan University

3.Department of Environment, Sichuan University

*Correspondence author

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Funding: National Natural Science Foundation of China，973project of the Ministry of Science and Technology of China（No.205903603，2005CB221406）

Opened online: 3 April 2007

Accepted by: none

Citation: Shi Limin,Wei Chu,Qu Fenfen.Low-temperature catalytic combustion of methane over MnOx-CeO2 mixed oxide catalysts: Effect of preparation method[OL]. [ 3 April 2007] http://en.paper.edu.cn/en_releasepaper/content/11918

The effect of preparation method on MnOx-CeO2 mixed oxide catalysts for methane combustion at low temperature was investigated by means of BET, XRD, XPS, H2-TPR techniques and methane oxidation reaction. The catalysts were prepared by the conventional coprecipitation, plasma and modified coprecipitation methods, respectively. It was found that the catalyst prepared by modified coprecipitation was the most active, over which methane conversion reached 90% at a temperature as low as 390℃. The XRD results showed the preparation methods had no effect on the solid solution structure of MnOx-CeO2 catalysts. More Mn4+ and richer lattice oxygen were found on the surface of the modified coprecipitation prepared catalyst with the help of XPS analysis, and its reduction and BET surface area were remarkably promoted. These factors could be responsible for its higher activity for methane combustion at low temperature.

Keywords:MnOx-CeO2 mixed oxide; solid solution; methane combustion; low-temperature activity.

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