类水滑石衍生金属混合氧化物在汽车尾气NO_x存储/还原催化剂中的应用

Application of hydrotalcite-like compounds derived mixed oxides as NO_x storage and reduction catalysts for vehicle NOxemission control

汽车尾气NO_x污染物的排放,不仅是造成城市灰霾和光化学烟雾污染的重要原因,而且对人体健康危害极大。类水滑石衍生NSR催化剂体系由于其优越的NO_x存储性能、热稳定性和抗硫性等特点受到广泛关注。为促进该技术的研究及应用,综述了类水滑石类催化剂应用于NSR技术的原理及研究成果,重点总结了化学组成、碱金属负载、贵金属负载、煅烧温度等因素对NO_x存储还原性能的影响,指出了类水滑石类催化剂应用于NSR技术中存在的问题及发展方向。

NOxemitted from vehicles is very harmful to human health,and it has been recognized as one of the most critical reasons for the severe gray haze and photochemical smog. Recently,layered double hydroxides（ LDHs） derived NOxstorage and reduction（ NSR） catalysts have attracted great attention due to excellent NOx storage capacity,thermal stability and sulfur resistance. The progresses in recent years have been summarized with emphasis on the effect of chemical composition of LDHs,alkali metal coating,noble metal doping,and the calcination temperature,etc. To further promote the application and intensive research of LDHs derived NSR catalysts,the problem and direction of LDHs derived NSR catalysts have been pointed out in detail.