稀燃汽车尾气中NO催化氧化催化剂研究进展

Research advance on the catalyst for NO catalytic oxidation in the lean-burn exhaust of vehicle

NO是稀燃汽车尾气中的主要污染物,关于稀燃条件下NOx的消除是当前环境催化研究的热点。从NO催化氧化为NO2在选择性催化还原(SCR)、存储还原(NSR)以及颗粒物捕集器(DPF)中起着重要的作用出发,重点综述了NO催化氧化催化剂,包括贵金属催化剂、负载型催化剂、复合金属氧化物催化剂等,以及H2O、SO2对催化剂活性的影响,并提出NO催化氧化研究存在的问题,并指出了发展方向。

NO is the main pollutant in the lean-burn exhaust of vehicles.To eliminate the nitrogen oxides under lean-burn condition is a hot issue in environmental catalysis.Based on the importance of the catalytic oxidation of NO to NO2 in SCR,NSR and DPF,emphases were put on the catalysts applied in catalytic oxidation of NO,such as noble metal catalysts,supported catalysts and complex metal oxide catalyst,and the influences of H2 O,SO2to the activity.Finally,the major existing problems and research direction in the field of NO catalytic oxidation were outlined.