用于HC-SCR还原NO_(x)的Cu基分子筛催化剂研究进展  

Research progress on supported Cu-based zeolite catalysts for the selective catalytic reduction of NO_(x) with hydrocarbons

作　　者：宁淑英 苏亚欣[1] 杨洪海[1] 温妮妮 NING Shuying;SU Yaxin;YANG Honghai;WEN Nini(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620

出　　处：《化工进展》2023年第3期1308-1320,共13页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(52276103)。

摘　　要：烃类化合物选择性催化还原(HC-SCR)是一种有效的脱硝技术,但是在较低温度下Cu基分子筛催化剂用于HC-SCR催化还原NO_(x)存在催化活性较低、活性温度窗口较窄的问题。本文针对铜/分子筛催化剂选择催化还原NO_(x)的研究进展,系统介绍了负载型Cu基分子筛催化剂在HC-SCR应用中的反应机理以及载体、负载Cu含量、制备工艺、还原剂、H_(2)O和SO_(2)对催化活性的影响。发现掺杂与铜产生协同作用的金属助剂有助于提高低温催化活性。最后提出了制备具有优异低温催化活性的HC-SCR铜基分子筛催化剂的策略和今后开发高效性能催化剂的研究方向,例如适当增加Cu负载量、控制Si/Al比以及进一步提高金属活性组分的分散性。Selective catalytic reduction of hydrocarbons (HC-SCR) is an effective denitrification technology,but the Cu-based molecular sieve catalysts used for catalytic reduction of NO_(x) by HC-SCR have problems of low catalytic activity and narrow active temperature windows at low temperatures.This work reviews the progress of selective catalytic reduction of NO_(x) by Cu/zeolite catalysts.In addition,the reaction mechanism of supported Cu-based zeolite catalysts in the application of HC-SCR and the effects of support,supported Cu content,preparation process,reducing agent,H_(2)O,and SO_(2) on the catalytic activity are systematically presented.It is found that doping metal additives that worked synergistically with copper could improve the low-temperature catalytic activity.Finally,the preparation strategy of Cubased zeolite catalysts with excellent low-temperature catalytic activity and future research directions for developing high-efficiency catalysts,such as appropriately increasing the Cu loading,controlling the Si/Al ratio,and further improving the dispersion of active metal components,are proposed,which could provide a theoretical basis and guide for the optimization and development of novel Cu-based zeolite catalysts with high efficiency at low temperature.

关 键 词：烃类化合物 选择催化还原 分子筛 催化剂 低温 优化 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]