小孔型分子筛在NH3-SCR脱硝领域的应用研究进展

Research Progress on the Application of Small-pore Molecular Sieves in NH3-SCR Denitrification

介绍了降低柴油车尾气氮氧化物(NOx)排放的小孔型分子筛在NH3-SCR领域的研究成果以及亟待解决的科学问题,重点分析了SSZ-13、SAPO-34、SAPO-18、SSZ-39等小孔分子筛与其NH3-SCR性能之间的内在原理与差异,阐明了硫(S)、磷(P)中毒与保护机理,并针对分子筛应用于NH3-SCR中所存在的问题提出了未来的发展方向。

In this paper,research findings and urgently pending scientific issues regarding the small-pore molecular sieve application in the NH3-SCR field for reduction of nitrogen oxide(NOx)emissions from diesel vehicle exhaust are introduced,the innate principles as well as differences among such small-pore molecular sieves as SSZ-13,SAPO 34,SAPO-18 and SSZ-39 and their NH3-SCR performances are emphatically analyzed,sulfur(S)and phosphorus(P)poisoning and protection mechanisms are illustrated,and the future direction of solving existing problems of applying molecular sieves in NH3-SCR is put forward.