贵金属催化剂上氢气选择性催化还原NO_(x)

Selective Catalytic Reduction of NO_(x)by Hydrogen over Noble Metal Catalysts

NO_(x)的控制对于改善大气环境质量具有重要意义,而氢气选择性催化还原(H_(2)-SCR)NO_(x)作为一种高效环保的脱硝技术而备受关注。本文总结概述了近年来贵金属催化剂在H_(2)-SCR脱硝反应中的研究进展,首先介绍了H_(2)-SCR反应机理,在此基础上分别论述了影响贵金属催化剂性能的因素(如活性组分、载体类型、助剂添加及组分存在形式等)及催化剂结构与性能的构效关系。最后,针对目前存在的问题展望了H_(2)-SCR脱硝未来的发展方向。

The control of NO_(x) is very important for the air quality improvement.Selective catalytic reduction of NO_(x) by hydrogen(H_(2)-SCR)has attracted much attention as an efficient and environmentally benign deNO_(x) technology.In this review,we summarize the research development in the H_(2)-SCR of NO_(x) over noble metal catalysts.The typical H_(2)-SCR reaction mechanisms are introduced first.Then the factors affecting the H_(2)-SCR performance of noble metal catalysts,such as the active metal,support type,the added promoter and the nature of active metal,and the structure-activity relationship have been discussed.Finally,the challenges and the prospects for future development of H_(2)-SCR catalyst are proposed.