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50h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。
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℃.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第4期892-897,共6页
CIESC Journal
基金
浙江省科技厅重点项目(2005C33041)
关键词
金掺杂
钙钛矿
催化燃烧
甲苯
Au doping
perovskites
catalytic combustion
toluene
