Low-temperature Catalytic Combustion of Methane over Modified MnOx-CeO2 Mixed Oxide Catalysts

Chem. J. Chinese Universities

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Low-temperature Catalytic Combustion of Methane over Modified MnO_x-CeO₂Mixed Oxide Catalysts

SHI Li-Min¹, CHU Wei¹*, ZHENG Li-Na², CHEN Mu-Hua¹, QU Fen-Fen¹, LUO Shi-Zhong¹

1. School of Chemical Engineering, Sichuan University, Chengdu 610065, China;
2. Key Laboratory of Instrumentation Science ＆ Dynamic Measurement of Education Ministry, North University of China, Taiyuan 030051, China

Received:2006-11-19 Revised:1900-01-01 Online:2007-06-10 Published:2007-06-10
Contact: CHU Wei

Abstract

Abstract: MnO_x-CeO₂ mixed oxide catalysts for methane combustion were prepared with co-precipitation me-thod. With the same content of Mn, the modified catalysts were gained via adding KMnO₄. These catalysts were characterized with XRD, LRS, XPS and TPR techniques, respectively. It was found that the solid solution structures of the catalysts were reserved, while the low-temperature activities were promoted remarkably duo to more Mn⁴⁺ species and easier reductions through properly changing the adding amounts of Mn(NO₃)₂and KMnO₄. With a molar ratio of 1∶4, the MnO_x-CeO₂catalyst exhibited the highest activity, over which methane conversion reached 90% at a temperature as low as 390 ℃, and a better stability.

Key words: Methane, Catalytic combustion, Low-temperature activity, Solid solution, MnO_x-CeO₂mixed oxide

CLC Number:

O643.3

TrendMD:

SHI Li-Min¹, CHU Wei¹*, ZHENG Li-Na², CHEN Mu-Hua¹, QU Fen-Fen¹, LUO Shi-Zhong¹. Low-temperature Catalytic Combustion of Methane over Modified MnO_x-CeO₂Mixed Oxide Catalysts[J]. Chem. J. Chinese Universities, doi: .

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Low-temperature Catalytic Combustion of Methane over Modified MnO_x-CeO₂Mixed Oxide Catalysts

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