催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (10): 951-953.

• 研究快讯 •    下一篇

Ce对Cu基氧氯化催化剂稳定性的影响

陈智涛,韩明汉,王德峥,魏飞   

  1. 清华大学化工系绿色反应工程与工艺北京市重点实验室, 北京 100084
  • 收稿日期:2008-10-25 出版日期:2008-10-25 发布日期:2008-10-25

Influence of Cerium on the Stability of Copper-Based Oxychlorination Catalyst

CHEN Zhitao, HAN Minghan*, WANG Dezheng, WEI Fei   

  1. Beijing Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2008-10-25 Online:2008-10-25 Published:2008-10-25

PDF

966

被引次数

21

摘要： 通过ICP-AES和XRD等表征手段,考察了稀土金属Ce化合物对Cu基氧氯化催化剂活性及稳定性的影响. 研究表明, Ce在反应初期转变成的CeO2具有储存和传递氧的功能,从而提高催化剂的活性. 在400 ℃反应300 h后,催化剂的活性显著下降,其原因是由于86%的Ce与载体发生作用,生成难溶的物质,失去助催化的作用. 同时,随着反应的进行, CeO2晶相晶粒长大也造成催化剂活性下降.

关键词: 氧氯化, 铈, 铜基催化剂, 载氧, 失活

Abstract: The role of cerium in the copper-based catalyst in HCl oxychlorination was t o transfer oxygen during the reaction, which accelerated the rate-determining s tep. In the used catalyst reacted for 300 h, the main part of cerium reacted wit h the carrier to form an inert phase, which had no co-catalytic effect.

Key words: oxychlorination, cerium, copper-based catalyst, oxygen storage, deactivation