催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (10): 1007-1011.

• 研究论文 • 上一篇    下一篇

V2O5/ACF催化剂低温下选择性催化还原NO的机理

侯亚芹 1,2, 黄张根 1, 马建蓉 3, 郭士杰 1   

  1. 1 中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001 2 中国科学院研究生院, 北京 100049 3 太原科技大学环境与安全学院, 山西太原 030024
  • 收稿日期:2009-10-25 出版日期:2009-10-25 发布日期:2013-06-06

Mechanism of Selective Catalytic Reduction of NO at Low Temperature over V2O5/ACF Catalysts

HOU Yaqin1,2, HUANG Zhanggen1,*, MA Jianrong3, GUO Shijie1   

  1. 1State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shangxi, China 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3School of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan 030024, Shangxi, China
  • Received:2009-10-25 Online:2009-10-25 Published:2013-06-06

PDF

1103

被引次数

24

摘要： 将 V2O5 担载在活性炭纤维 (ACF) 上制得 V2O5/ACF 催化剂, 并采用暂态响应实验和 NH3 吸附氧化实验等考察了影响 V2O5/ACF 催化剂上选择性催化还原 (SCR) 反应的关键因素. 结果表明, NH3 在催化剂表面的吸附是必要的, 而且该吸附是一个快速过程; 气相 O2 的存在有利于形成催化剂中所需的活性氧化态物种. NH3 吸附-脱附与原位质谱相结合的实验表明, V2O5/ACF 催化剂具有吸附 NH3 和将 NH3 氧化为 N2H2 的能力, N2H2 为 NH3 氧化的一种中间体.

关键词: 五氧化二钒, 活性炭纤维, 选择性催化还原, 氨, 吸附, 活化, 机理

Abstract: A novel V2O5/activated carbon fiber (ACF) catalyst for NO removal was prepared. The mechanism of selective catalytic reduction of NO was carried out by a transient response experiment and NH3 adsorption and oxidation. The results show that NH3 adsorption is necessary and is a fast process. The active sites can be easily formed in the presence of O2. Adsorption and temperature-programmed desorption with online mass spectroscopy analysis were used to study the adsorption and oxidation behavior of NH3 at 120 oC over the V2O5/ACF catalyst. The adsorbed NH3 can be oxidized to N2H2 on the catalyst surface, and N2H2 is an intermediate of oxidized NH3.

Key words: vanadium oxide, activated carbon fiber, selective catalytic reduction, ammonia, adsorption, activation, mechanism