CHA型分子筛在柴油车NO_(x)排放控制的研究进展

Research progress of CHA molecular sieve in NOx emission control of diesel vehicles

CHA型分子筛具有比表面积大、孔隙结构发达、酸性可调控等优势,是柴油车NO_(x)排放控制最具有发展潜力的载体材料。基于对50多篇文献的分析,综述了近20年来CHA型分子筛在柴油车用PNA和SCR催化材料中的应用研究进展,阐述了活性组分、分子筛结构性质、尾气组分等3个方面对CHA型分子筛载体催化剂性能的影响,对CHA型分子筛的研究方向进行了展望。

CHA molecular sieve is the most promising carrier material for NOemission control of diesel vehicles due to its large specific surface area,developed pore structure,and adjustable acidity.Based on the analysis of more than 50 articles,the research progress of CHA molecular sieve in PNA and SCR catalytic materials for diesel vehicles in the past 20 years was reviewed.The effects of active components,molecular sieve structure properties,and gas components on the performance of the catalyst were described.The research direction of CHA molecular sieve was prospected.