钴铝复合氧化物负载金催化剂的制备及催化分解N_2O  

Preparation of Co-Al mixed oxide supported gold catalysts and their catalytic activity for N_2O decomposition

作　　者：徐晓玲[1] 徐秀峰[1] 张国涛[1] 牛宪军[1] 

机构地区：[1]烟台大学应用催化研究所,山东烟台264005

出　　处：《燃料化学学报》2009年第5期595-600,共6页Journal of Fuel Chemistry and Technology

基　　金：教育部留学回国人员科研启动基金(2004-527);中国科学院山西煤化所煤转化国家重点实验室开放基金(06-603)

摘　　要：分别用离子交换法和共沉淀法制备了钴铝复合氧化物负载金催化剂,用于催化分解N2O。离子交换法制备的催化剂活性优于共沉淀法制备的催化剂。对于离子交换法制备的催化剂,考察了金负载量、HAuCl4溶液的预处理方式、焙烧温度对催化剂活性的影响,用BET、XRD、H2-TPR等技术对催化剂进行了表征,优化出了催化剂的最佳制备参数:金负载量1.1%、预调节HAuCl4溶液的pH值至9.0、300℃焙烧。在钴铝氧化物中加入适量的助剂Na,提高了Co3+的还原性和催化剂的低温活性,在此基础上制备的1.5%Na/1.1%Au/Co-Al催化剂的低温活性优于1.1%Au/Co-Al和1.5%Na/Co-Al。Au/Co-Al catalysts were prepared by using the ion-exchanged and co-precipitation methods, and their activities for the catalytic decomposition of N2O were tested. BET, XRD, and H2-TPR techniques were used to characterize the catalysts. The results show that the activity of Au/Co-Al catalyst prepared by using ion-exchanged method is higher than that using co-precipitation method. For the catalysts prepared by ion-exchanged method, the effects of preparation parameters, such as Au loading, pretreatment of HAuCl4 solution, and calcination temperatures, upon N2O conversion were investigated. The optimal preparation parameters of Au/Co-Al catalysts are that 1.1% of Au loading, pH value of HAuCl4 solution adjusted to 9.0, and 300℃ of calcination temperature. It is indicated that the addition of Na species in Co-Al mixed oxide promoted the reduction of Co^3＋ to Co^2＋ and enhanced the catalytic activity for N2O decomposition.

关 键 词：N2O催化分解 钴铝复合氧化物 负载型金催化剂 制备参数 催化活性 

分 类 号：O643[理学—物理化学]