改进的MnO_x-CeO_2复合氧化物催化剂上甲烷低温催化燃烧  

Low-temperature Catalytic Combustion of Methane over Modified MnO_x-CeO_2 Mixed Oxide Catalysts

作　　者：士丽敏[1] 储伟[1] 郑丽娜[2] 陈慕华[1] 瞿芬芬[1] 罗仕忠[1] 

机构地区：[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

出　　处：《高等学校化学学报》2007年第6期1178-1180,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:205903603)资助

摘　　要：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.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 solu-tion 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 KMn04. 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.

关 键 词：甲烷 催化燃烧 低温活性 固溶体 MnOx-CeO2 复合氧化物 

分 类 号：O643.3[理学—物理化学]