制备条件对Au/LaCoO_3催化氧化CO性能的影响  

Effect of Preparation Conditions on Au/LaCoO_3 Catalytic Performance for CO Oxidation

作　　者：孟根图雅[1] 贾美林[1] 照日格图[1] 

机构地区：[1]内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022

出　　处：《分子催化》2009年第5期442-447,共6页Journal of Molecular Catalysis(China)

基　　金：教育部新世纪人才支持计划(NCET-06-0268);国家自然科学基金(20563003);内蒙古师范大学研究生科研创新基金(YJS07007)

摘　　要：采用溶胶-凝胶法制备了钙钛矿型复合氧化物LaCoO3,并用沉积-沉淀法(DP法)制备了Au/LaCoO3催化剂.考察了制备条件对催化剂催化氧化CO活性的影响.结果表明,制备过程中,溶液pH、pH调节顺序及催化剂焙烧温度对催化剂活性均有一定影响.Au/LaCoO3催化剂的最佳制备条件为:沉积过程中在HAuCl4溶液中先加入载体后,再调节溶液pH=8,得到的催化剂经250℃焙烧后可提高催化剂稳定性.Perovskite Oxide LaCoO3 were prepared by sol-gel method, then Au/LaCoO3 catalyst was prepared by deposition-precipitation method. The catalytic performance for CO low-temperature oxidation over this catalyst was investigated. The results showed the solution pH, the adjusting order of pH value and calcination temperature had different effect on catalyst activity. The optimal preparation condition for Au/LaCoO3 is as following： the support was firstly added to the precursor solution HAuCl4 , then pH was adjusted to 8. Calcination at 250℃ decreased the activity while improved the stability of catalyst.

关 键 词：Au/LaCoO3催化剂 制备条件 CO催化氧化 

分 类 号：O643.3[理学—物理化学]