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）.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第5期12-16,共5页
Environmental Science
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
three way catalyst
（Ce, Zr）O2 solid solution
oxygen storage capacity
strong metal-support interaction
