作　　者： ; ; ; (曹红岩）; (龚茂初）; (陈耀强）;

机构地区： 西南石油大学石油工程学院油气藏地质及开发工程国家重点实验室

出　　处： 《物理化学学报》 2012年第5期1237-1242,共6页

摘　　要： 采用共沉淀法和胶溶法分别制备了高性能的储氧材料Ce0.45Zr0.45Y0.07La0.03O1.95(OSM)和耐高温高比表面的La-Ba-Al2O3,并以它们为载体,制备了一系列整体式铁基催化剂.考察了该系列催化剂对甲烷稀薄燃烧的催化性能.并用低温N2吸附-脱附,储氧量(OSC)测试,X射线衍射(XRD)和H2程序升温还原(H2-TPR)等测试手段考察了不同Ce0.45Zr0.45Y0.07La0.03O1.95/La-Ba-Al2O3质量比对催化剂特性的影响.活性测试结果表明,当Ce0.45Zr0.45Y0.07La0.03O1.95/La-Ba-Al2O3质量比为1:1时新鲜和老化催化剂的活性均最好,新鲜催化剂可在50000h-1的高空速条件下使含量为1%(体积分数)的甲烷在446℃起燃,553℃完全转化;低温氮气吸附-脱附测试结果和H2-TPR表明,不同的Ce0.45Zr0.45Y0.07La0.03O1.95/La-Ba-Al2O3质量比使催化剂表现出不同的织构性能和还原性能;XRD测试结果表明,OSM以均一固溶体存在,Fe高度分散在载体上.综合以上表征手段得出:合适的Ce0.45Zr0.45Y0.07La0.03O1.95/La-Ba-Al2O3质量比导致催化剂具有优异的稀薄甲烷催化燃烧活性和热稳定性. Ce 0.45 Zr 0.45 Y 0.07 La 0.03 O 1.95,an oxygen storage material（OSM）,and La-Ba-Al 2 O 3 have been prepared by co-precipitation and peptization,respectively,to be used as supports for Fe 2 O 3 catalysts.The Fe 2 O 3 catalysts were obtained by impregnation methods and then coated on the monolith.The catalytic combustion of low concentration（thin）methane was investigated over the prepared catalysts.The effect of the OSM/La-Ba-Al 2 O 3 mass ratio on the physicochemical properties of the catalysts was investigated using nitrogen adsorption-desorption,oxygen storage capacity（OSC）measurements,X-ray diffraction（XRD）,and H 2-temperature-programmed reduction（H 2-TPR）.The highest catalytic activity of both fresh and aged Fe 2 O 3 catalysts for thin methane combustion was observed when the mass ratio of OSM/La-Ba-AL 2 O 3 was 1：1.At this OSM/La-Ba-AL 2 O 3 mass ratio,methane started to convert at 446℃ and completely converted at 553℃,with 1%（volume fraction）CH 4 and a gas hourly space velocity（GHSV）of 50000 h-1.The Fe-based monolithic catalysts with different mass ratios of OSM to La-Ba-Al 2 O 3 had different specific surface areas and reducibilities.XRD results showed that OSM existed in uniform solid solution and Fe 2 O 3 was well dispersed on the binary supports.Based on the characterizations,the high catalytic activity and thermal stability of the catalysts can be attributed to the proper coordination of OSM and La-Ba-AL 2 O 3 for thin methane combustion.

关 键 词： 基整体式催化剂 质量比 稀薄甲烷催化燃烧

领　　域： [理学] [理学]