Au/Co_3O_4催化剂的制备及其对CO催化氧化性能的研究  

Preparation of Au/Co_3O_4 and It's Catalytic Performance for CO Oxidation

作　　者：海锋[1] 贾美林[1] 照日格图[1] 孟根图雅[1] 李达[1] 李彦锋[2] 

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 [2]兰州大学化学化工学院,甘肃兰州730000

出　　处：《石油化工高等学校学报》2008年第2期20-24,共5页Journal of Petrochemical Universities

基　　金：国家自然科学基金项目(20563003);教育部新世纪优秀人才支持计划项目(NCET-06-0268);内蒙古自治区自然科学基金重点项目(200508010203)

摘　　要：采用不同方法制备了Au/Co3O4催化剂,考察了制备方法对CO催化氧化活性的影响;改变载体的制备条件,得到一系列Co3O4载体,并采用沉淀-沉积法制备了相应Au/Co3O4催化剂,考察了载体的制备条件对CO催化氧化性能的影响,并对催化剂进行了BET,XRD,TPR和XPS表征。结果表明,载体的制备方法对催化剂的催化活性有显著影响,经沉淀-沉积法制备的催化剂活性最好;载体的制备条件对催化剂的活性也有一定影响,分散剂的加入和微波处理均提高催化剂的活性。XPS测试结果表明,Auδ+是催化剂的活性相组分,OH-含量的增加使催化剂的活性提高;TPR结果显示活性组分Au的引入促进了载体的还原,并有利于提高催化剂活性。The different method and condition were used to prepare Au/Co3O4catalysts and Co3O4 support. The aqueous precipitation and deposition-precipitation method were used to prepare Au/Co3 O4 catalysts. The effect of preparation method and the condition of support on the catalyst activity of CO was investigated. The BET, XRD, TPR and XPS were carried out to analyze the influence factor on the catalysts activity. The results show that the catalytic activity is effected by preparation method distinctly, the catalyst prepared by deposition-precipitation method has higher activity than the other catalysts. Furthermore, the preparation conditions of support also affected the catalyst activity and the addition of dispersant and use of microwave in the support preparation process can improve the catalytic activity. The result of XPS indicates that Au^8＋ species is catalytic activity component, the increasing of OH^- content can promote catalytic activity. The result of TPR indicates that addition of gold can accelerate the reduction of support and improve catalytic activity.

关 键 词：Au催化剂 制备方法 氧化钴 一氧化碳氧化 

分 类 号：O643[理学—物理化学]