Pd/CZ/Al_2O_3催化剂的制备、表征与三效催化性能  

Preparation,Characterization and Three Way Catalytic Performance for Pd/CZ/Al_2O_3 Catalyst

作　　者：房师平[1] 陈宏德[1] 田群[1] 姚青[1] 韩芸[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085

出　　处：《环境科学》2005年第5期12-16,共5页Environmental Science

摘　　要：以共浸渍法制得的氧化铝负载铈锆固溶体为载体,并浸渍贵金属Pd得到了Pd/CZ/Al2O3催化剂.实验结果表明,该催化剂在老化前后都表现出良好的三效催化活性,新鲜样品Pd/CZ/Al2O3活性与Pd/CZ相当,老化后样品前者优于后者.结合XRD,BET,TPR等表征手段,讨论了Pd/CZ/Al2O3的催化活性特别是高温老化后活性与其组成结构之间的内在关系,揭示了其老化后仍具有较高活性的主要原因在于保持了Pd与CZ/Al2O3复合载体之间的强相互作用(SMSI).Pd/CZ/Al2O3 catalyst was prepared by impregnating a noble metal solution to the support CZ/Al2O3 which was prefabricated by co-impregnation. The investigation results show that Pd/CZ/Al2O3 has a superior three-way catalytic performance, which is comparable to Pd/CZ for the fresh sample and a better one after thermal ageing. Based on the XRD, BET and TPR characterizations, the internal relationship between catalytic performance, composition and structure was discussed. The relatively high activity after thermal ageing is ascribed to the maintenance of the Strong Metal-Support Interaction （SMSI）.

关 键 词：三效催化剂 铈锆固溶体 储氧能力 金属与载体间强相互作用 

分 类 号：X511[环境科学与工程—环境工程] O643[理学—物理化学]