Improvement of Gold to Reducibility of La-Ce-Mn Catalyst under Lean Combustion  

作　　者：翁端 徐鲁华 吴晓东 沈美庆 

机构地区：[1]Department of Material Science & Engineering, Tsinghua University [2]School of Chemistry Engineering University

出　　处：《Journal of Rare Earths》2003年第2期194-197,共4页稀土学报（英文版）

基　　金：ProjectsupportedbyAcademicTeacherSustentationFundofMinistryofEducationofChina (2 0 0 0~ 2 0 0 1)

摘　　要：The effect of Au on the reducibility of La Ce Mn catalyst was studied in the synthetic exhaust gas mixture containing 10% oxygen. The characteristics of samples were analyzed by BET, SEM, XRD and activity evaluation. The results show that, in lean combustion, the performance of perovskite type catalysts is evidently enhanced through adding Au, and specially a satisfying reducibility for NO x is demonstrated between 300～500 ℃. The catalytic activity of samples increases with the loading amount of Au, and the maximum conversion rate for NO x decomposition reaches up to 47% in 360～400 ℃. Moreover, the dispersivity and uniformity of the surface distribution of perovskite with Au have an important influence on the catalytic activity.The effect of Au on the reducibility of La Ce Mn catalyst was studied in the synthetic exhaust gas mixture containing 10% oxygen. The characteristics of samples were analyzed by BET, SEM, XRD and activity evaluation. The results show that, in lean combustion, the performance of perovskite type catalysts is evidently enhanced through adding Au, and specially a satisfying reducibility for NO x is demonstrated between 300～500 ℃. The catalytic activity of samples increases with the loading amount of Au, and the maximum conversion rate for NO x decomposition reaches up to 47% in 360～400 ℃. Moreover, the dispersivity and uniformity of the surface distribution of perovskite with Au have an important influence on the catalytic activity.

关 键 词：catalyts additive gold perovskite La  Ce  Mn REDUCIBILITY surface analysis rare earths 

分 类 号：O643.3[理学—物理化学]