化工学报 ›› 2008, Vol. 59 ›› Issue (4): 892-897.

• 催化、动力学与反应器 • 上一篇    下一篇

Au改性La0.8Sr0.2MnO3催化剂的催化燃烧性能

卢晗锋;黄海凤;刘华彦; 陈银飞;刘化章   

  1. 浙江工业大学化学工程与材料学院,绿色化学合成技术国家重点实验室培育基地,浙江 杭州 310014
  • 出版日期:2008-04-05 发布日期:2008-04-05

Catalytic combustion performance of Au doping La0.8Sr0.2MnO3 perovskites

LU Hanfeng;HUANG Haifeng;LIU Huayan;CHEN Yinfei;LIU Huazhang   

  • Online:2008-04-05 Published:2008-04-05

摘要:

采用共沉淀(CP)和沉积-沉淀法(DP)分别制备了0.5%(质量分数)金掺杂的Au-LSM和Au/LSM钙钛矿催化剂,以甲苯催化燃烧为模型反应测试催化剂活性,并用XRD、BET、H2-TPR对其进行表征。结果表明,Au掺杂并不改变La0.8Sr0.2MnO3催化剂的织构性质,但明显增强了催化剂表面氧的活动性,提高了其低温催化氧化活性。与DP法制备的Au/LSM相比,Au-LSM表现出更好的催化性能,其催化活性与商业贵金属Pd/Al2O3相当。通过对焙烧温度考察以及50 h的变温活性测试,Au-LSM催化性能并没有发生较大变化,催化剂具有良好的稳定性。

关键词:

金掺杂, 钙钛矿, 催化燃烧, 甲苯

Abstract:

Perovskite-type oxides of Au-LSM and Au/LSM with 0.5%(mass) Au doping were synthesized by the coprecipitation (CP) and the deposition-precipitation (DP) processes respectively.They were tested in a flow reactor for total combustion of toluene, and characterized by XRD, BET, H2-TPR.The results showed that Au doping did not affect the texture properties of La0.8Sr0.2MnO3, but Au actually enhanced the surficial oxygen mobility of catalysts, and increased catalytic oxidation activity at a low temperature.Compared with Au/LSM, Au-LSM showed better catalytic performance, and its activity was similar to that of the commercial catalyst Pd/Al2O3.Au-LSM also had good stability because its performance did not change significantly after 50 h on stream in the temperature range of 280—400℃.

Key words:

金掺杂, 钙钛矿, 催化燃烧, 甲苯