The catalytic behavior of La-Mn-O nanoparticle perovskite-type oxide catalysts for the combustion of the soot particle from the diesel engine  

作　　者：WANG Hong ZHAO Zhen XU Chunming LIU Jian LU Zhixiao 

机构地区：[1]State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102249, China [2]Beijing Institute of Petrochemical Technology, Beijing 102617, China

出　　处：《Chinese Science Bulletin》2005年第14期1440-1444,共5页

基　　金：supported by the National Natural Science Foundation of China(Grant No.20473053);the Scientific Research Key Foundation for the Returned Overseas Chinese Scholars of State Education Ministry.

摘　　要：The La1?xMx MnO3(M=Li, Na, K, Rb, x=0, 0.10, 0.25) perovskite-type oxides whose sizes are nanoparticle have been prepared by the citric acid-ligated method. The characters of the catalysts were characterized by means of XRD, IR, SEM and BET surface area measurement. The catalytic activity for the combustion of soot particulate was evaluated by a technique of the temperature-programmed reaction. In the LaMnO3 catalyst, the partial substitution of alkali metal (Li, Na, K, Rb) into A-site enhanced the catalytic activity for the combustion of soot particle. The La0.75K0.25MnO3 oxides are good candidate catalysts for the soot particle removal reaction, and the combustion tem- peratures of soot particle are between 285℃ and 430℃ when the contact of catalysts and soot is loose, and their catalytic activities for the combustion of soot particle are as good as supported Pt catalysts, which is the best catalyst system so far reported for soot combustion under loose con- tact conditions.The La1-xMx MnO3（M=Li, Na, K, Rb, x=0, 0.10,0.25） perovskite-type oxides whose sizes are nanoparticle have been prepared by the citric acid-ligated method. The characters of the catalysts were characterized by means of XRD, IR, SEM and BET surface area measurement. The catalytic activity for the combustion of soot particulate was evaluated by a technique of the temperature-programmed reaction. In the LaMnO3 catalyst, the partial substitution of alkali metal （Li, Na, K, Rb） into A-site enhanced the catalytic activity for the combustion of soot particle. The La0.75K0.25MnO3 oxides are good candidate catalysts for the soot particle removal reaction, and the combustion temperatures of soot particle are between 285℃ and 430℃ when the contact of catalysts and soot is loose, and their catalytic activities for the combustion of soot particle are as good as supported Pt catalysts, which is the best catalyst system so far reported for soot combustion under loose contact conditions.

关 键 词：柴油机 燃烧室 煤烟离子 氧催化剂 接触反应 

分 类 号：TK42[动力工程及工程热物理—动力机械及工程]