催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (1): 4-6.

• 研究快讯 • 上一篇    下一篇

新型铬锰复合氧化物低温选择性催化氨还原NOx

陈志航,李雪辉,高翔,江燕斌,吕扬效,王芙蓉,王乐夫   

  1. 华南理工大学化学与化工学院, 广东省绿色化学产品技术重点实验室, 广东广州 510640
  • 收稿日期:2009-01-25 出版日期:2009-01-25 发布日期:2012-10-17

Selective Catalytic Reduction of NOx with NH3 on a Cr-Mn Mixed Oxide at Low Temperature

CHEN Zhihang, LI Xuehui*, GAO Xiang, JIANG Yanbin, L Yangxiao, WANG Furong, WANG Lefu   

  1. School of Chemistry and Chemical Engineering, Guangdong Province Laboratory of Green Chemical Technology, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2009-01-25 Online:2009-01-25 Published:2012-10-17

PDF

1029

被引次数

84

摘要： 采用柠檬酸法合成了一系列铬锰复合氧化物催化剂,利用X射线衍射及X射线光电子能谱研究了催化剂活性相态,并考察了铬锰摩尔比对反应活性的影响. 结果表明,该体系在有氧条件下氨低温选择性催化还原氮氧化物反应中显示出优异的活性,其中Cr(0.4)-MnOx催化剂具有最佳低温催化活性,在空速30000h-1和120 ℃条件下, NOx转化率达98.5%, N2选择性达100%. 在MnOx中添加Cr后形成了CrMn1.5O4晶相, 该相态在低温选择性催化还原NOx过程中起重要作用.

关键词: 铬锰复合氧化物, 低温, 选择性催化还原, 氮氧化物, 氨

Abstract: A series of Cr-Mn mixed oxide catalysts were prepared by the citric acid met hod. This catalytic system has excellent activity with 98.5% NOx conversi o n and 100% selectivity for N2 on Cr(0.4)-MnOx at 120 ℃ and space velo city of 30000 h-1. The addition of chromium to MnOx can gene rate a CrMn1.5O4 crystal phase, which is the main active center.

Key words: chromium-manganese mixed oxide, low temperature, selective catalytic reduction, nitrogen oxide, ammonia