催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (2): 124-130.

• 研究论文 • 上一篇    下一篇

Cu-Ce-Zr-O复合氧化物催化剂的制备与三效催化性能

郭锡坤,贾海建,范倩玉,李文衍,刘伟明   

  1. 汕头大学化学系, 广东汕头 515063
  • 收稿日期:2009-02-25 出版日期:2009-02-25 发布日期:2012-11-21

Preparation and Three-Way Catalytic Performance of Cu-Ce-Zr-O Mixed Oxide Catalysts

GUO Xikun*, JIA Haijian, FAN Qianyu, LI Wenyan, LIU Weiming   

  1. Department of Chemistry, Shantou University, Shantou 515063, Guangdong, China
  • Received:2009-02-25 Online:2009-02-25 Published:2012-11-21

PDF

790

被引次数

26

摘要： 采用柠檬酸溶胶凝胶法制备了Cu-Ce-Zr-O复合氧化物催化剂. 当Ce∶Zr∶Cu摩尔比为2∶8∶5时,制得的Ce0.2Zr0.8Cu0.5-O2-λ催化剂具有较佳的三效催化性能和较宽的工作窗口. 当空燃比为1.33(富氧)时, CO, C3H6和NO的起燃温度分别为183, 257和236 ℃, 并且当温度高于340 ℃时都能完全转化; 催化剂经高温老化后CO, C3H6和NO的起燃温度仍较低,分别为225, 350和350 ℃. X射线衍射、X射线光电子能谱和程序升温还原的结果表明,部分Cu进入 Ce-Zr固溶体形成Cu-Ce-Zr固溶体; Cu与Ce产生协同效应使Ce0.2Zr0.8Cu0.5O2-λ催化剂的低温活性明显提高,并且在贫燃情况下具有更高的三效催化性能.

关键词: 铜, 铈, 锆, 复合氧化物, 三效催化剂, 溶胶凝胶法

Abstract: A mixed oxide three-way catalyst Cu-Ce-Zr-O, which could efficiently purify the automobile exhaust, was prepared using non-precious metal. Under lean-bu rn conditions (air/fuel ratio of 1.33), the catalyst showed better three-way c a talytic performance. The light-off temperatures for CO, C3H6, and NO were 1 83, 257, and 236 ℃, respectively; and the complete conversion temperatures for the t hree gases were 197, 340, and 286 ℃, respectively. At low working temperature, NO, CO, and C3H6 could be converted into innoxious gases.

Key words: copper, ceria, zirconia, mixed oxide, three-way catalyst, sol-gel method