摘要:

介绍了降低柴油车尾气氮氧化物(NO_x)排放的小孔型分子筛在 NH₃-SOR 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。

关键词: ​柴油车尾气 / NOx / NH3-SCR / 小孔分子筛 / S、P中毒

Abstract:

ln 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(NO_x)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.

Keywords: diesel vehicle exhaust / NOx / NH3-SCR / small-pore molecular sieve / sulfur(S) and phosphorus(P)poisoning