高等学校化学学报

高等学校化学学报

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改进的MnOx-CeO2复合氧化物催化剂上甲烷低温催化燃烧

士丽敏1, 储伟1, 郑丽娜2, 陈慕华1, 瞿芬芬1, 罗仕忠1   

    1. 四川大学化学工程学院, 成都 610065;
    2. 中北大学仪器科学与动态测试教育部重点实验室, 太原 030051
  • 收稿日期:2006-11-19 修回日期:1900-01-01 出版日期:2007-06-10 发布日期:2007-06-10
  • 通讯作者: 储伟

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

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摘要： 在Mn含量不变的条件下, 通过调变前驱体Mn(NO3)2与KMnO4的添加量, 以共沉淀法制备了改进的MnOx-CeO2催化剂, 采用XRD, LRS, XPS和TPR测试手段对催化剂进行了表征, 并研究了对甲烷催化燃烧的低温性能.

关键词: 甲烷, 催化燃烧, 低温活性, 固溶体, MnOx-CeO2复合氧化物

Abstract: MnOx-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)2 and KMnO4. With a molar ratio of 1∶4, the MnOx-CeO2 catalyst 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, MnOx-CeO2 mixed oxide

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