不同结构的分子筛在柴油车尾气SCR脱硝中的应用浅述

Different Stuctural of Molecular Sieve's Applications in Selective Catalytic Reduction(SCR)of NOx from Diesel Engine Exhaust

氮氧化物作为主要大气污染物,对人类、动植物及生活的环境都有严重的危害作用。如何从其主要来源机动车(包括柴油和汽油)尾气中去除氮氧化物是当今大气环境保护的一个重要课题。SCR法是最为通用且商业化水平较高的脱硝技术,而SCR催化剂作为SCR脱硝系统的核心更是研究的重点[1]。分子筛催化剂,例如ZSM,FAU,CHA等,由于其活性高、操作温度窗口宽、水热稳定性好逐渐成为今后研究的热点[2]。

Nitrogen oxides as primary air pollutants do harm to humans, animals, plants and living environment. How to remove nitrogen oxides from mainly source- motor vehicle exhaust, including diesel engine exhaust and gasoline engine exhaust, is an important subject in atmospheric environmental protection today. The selective catalytic reduction（SCR） of NOx is one of the most widely used and immensely commercialized NOx abatement technologies. Therefore SCR catalyst as the core of SCR catalytic system has received extensive research interest. Molecular sieve based catalysts, such as ZSM, FAU, CHA etc, have become a hot area of research due to their highly activity, widely reaction temperature window and good hydrothermal stability.