铈锆复合氧化物在摩托车尾气净化催化剂中的应用  

The Application of Ceria-Zirconia Composite Oxide in Motorcycle Catalyst

作　　者：赵明[1] 蔡黎[1] 余全伟[1] 龚茂初[1] 袁书华[1] 陈耀强[1] 

机构地区：[1]四川大学,四川成都610064

出　　处：《稀有金属材料与工程》2007年第A03期277-281,共5页Rare Metal Materials and Engineering

基　　金：国家重点基金项目(20333030);"973"项目(2005CB221404)资助

摘　　要：采用共沉淀法制备了Ce_(0.7)Zr_(0.3)O_2和Ce_(0.7)Zr_(0.2)Y_(0.1)O_2两种复合氧化物,并用XRD、BET及OSC等方法对复合氧化物的结构、织构及储氧性能进行了表征。结果表明,2种复合氧化物均形成了立方相的铈锆固溶体并具有良好的织构及热稳定性能,经1000℃,5h老化后的Ce_(0.7)Zr_(0.2)Y_(0.1)O_2比表面积仍高达50 m^2/g以上。将所制备的复合氧化物用于摩托车尾气净化三效催化剂,模拟摩托车尾气的组成,分别对Pt-Rh/Ce_(0.7)Zr_(0.3)O_2和Pt-Rh/Ce_(0.7)Zr_(0.2)Y_(0.1)O_2 2种催化剂进行了活性评价。结果显示,催化剂Pt-Rh/Ce_(0.7)Zr_(0.2)Y_(0.1)O_2在老化前后均具有高的三效催化活性和高的抗热老化性及宽的空燃比窗口。The Ce0.7Zr0.3O2 and Ce0.7Zr0.2Y0.1O2 composite＇ oxides were prepared by co-precipitation. The crystalline phase structure, surface area and oxygen storage capacity （OSC） of the two oxides were characterized by XRD, BET and OSC. The Ce0.7Zr0.3O2 and Ce0.7Zr0.2Y0.1O2 were used to prepare the three-way catalyst （TWC） for the motorcycle exhaust gas and its influence on the performance of TWC was investigated. The results showed that the Ce0.7Zr0.3O2 and Ce0.7Zr0.2Y0.1O2 have a cubic structure and good texture property. The catalytic activity of Pt-Rh/Ce0.7Zr0.3O2 and Pt-Rh/Ce0.7Zr0.2Y0.1O2 was investigated using simulated emission gas of motorcycle, and the results revealed that the catalyst of Pt-Rh/Ce0.7Zr0.2Y0.1O2 has a higher activity and wider working-window, and it is a good catalyst with higher thermal stability.

关 键 词：PT RH 铈锆复合氧化物 摩托车 三效催化剂 

分 类 号：TQ426[化学工程]