摘要
用共沉淀法制备了负载型Au/CdO催化剂。考察了以氧化镉为载体金催化剂的制备条件及CO低温催化氧化活性。结果表明,焙烧温度、预处理条件对催化剂的活性有较大的影响,573K焙烧,空气预处理的催化剂活性最好。XRD、TPR、TPD结果表明,活性金高度分散在氧化镉载体上,氧化态的金是活性中心,CO和O2均吸附在金上,其反应遵循Langmuir＿Hinshelwood吸附机理。
Supported Au/CdO catalyst was prepared by co_precipitation.The preparation conditions and low_temperature catalytic activity for CO oxidation were studied.The results indicate that the activity of the catalyst is greatly related with the calcined temperature and the pretreatment condition.The highest activity is attained by calcination in 573 K and pretreatment in air.Results of XRD,TPR and TPD have showed that the active state gold disperses highly on CdO and catalytic active centers are the oxidized state gold.O2 and CO are adsorbed by active centers of gold.The reaction follows the Langmuir_Hinshelwood adsorption mechanism.
出处
《江西科学》
2003年第2期80-83,共4页
Jiangxi Science
