摘要
采用共沉淀法和金属有机配合物固载法,分别制备了钴氧化物负载的纳米金催化剂,考察了该催化剂对CO低温氧化反应的催化活性及其制备方法和制备条件,如焙烧温度和时间、金的负载量、活性组分前体、沉淀剂的滴加顺序等因素对催化性能的影响.结果表明:严格控制制备条件,上述两种方法制备的3%Au/Co3O4催化剂,对CO氧化反应都具有很高的催化活性,可分别于-22℃和-5℃将空气中1%的CO完全转化为CO2.XRD和TEM测试结果显示,催化剂上的金颗粒大小在10nm范围内,载体为适度结晶的四氧化三钴.
Cobalt oxide supported nanometer gold catalysts were prepared by co\|precipitation and organo\|gold complex grafting method respectively. The catalytic performance for CO low\|temperature oxidation over these catalysts was evaluated and the effects of preparation methods and conditions on catalytic activities were investigated. It was found that under the conditions controlled strictly, 3% Au/Co\-3O\-4 catalysts prepared by the two methods mentioned above exhibit very high catalytic activities for CO oxidation and can oxidize 1%(vol.) CO in air to CO\-2 completely at -22 ℃ and -5 ℃ respectively. TEM and XRD measurements of the catalysts show that the size of gold particles on them is in the range of about ten nanometer, while the support is in a state of partially\|crystallized Co\-3O\-4.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2003年第4期264-269,共6页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金资助项目(29873041)
北京化工大学可控化学反应科学与技术基础教育部重点实验开发课题.
