NH_(3)-SCR脱硝催化剂抗硫性能的研究进展  

Research Progress in Sulfur Tolerance of NH_(3)-SCR Catalysts

作　　者：史光[1] 朱繁[1] 喻瑞 SHI Guang;ZHU Fan;YU Rui(MCC Capital Engineering&Research Incorporation Ltd,Beijing 100176,China)

机构地区：[1]中冶京诚工程技术有限公司,北京100176

出　　处：《分子催化》2023年第4期405-418,I0004,共15页Journal of Molecular Catalysis(China)

摘　　要：氮氧化物(NOx)是一种重要的大气污染物,它造成严重的环境问题,同时威胁人类健康.以钢铁烧结烟气为代表的固定源和以柴油机尾气为代表的移动源是氮氧化物的主要来源.氨气选择性催化还原法(NH_(3)-SCR)是目前最有效且应用最广泛的NOx脱除技术.然而,无论是固定源还是移动源上NH_(3)-SCR催化剂,都不可避免地会被SO_(2)毒化,造成催化剂失活,限制了NH_(3)-SCR技术的进一步应用.因此,研究NH_(3)-SCR催化剂的SO_(2)中毒机制以及提高催化剂的抗硫性能至关重要.我们对固定源脱硝的金属氧化物和移动源上脱硝的Cu基分子筛这两类不同催化剂体系的SO_(2)中毒机制的研究进展进行了介绍,并对这两种催化剂上提高抗硫性能改性方法的研究进展进行了评述,为未来的研究提供了参考.Nitrogen oxides(NO_(x)),a kind of the most severe atmospheric pollutants,not only cause serious environmental problems,but also are a threat to human health.The main sources of NO_(x) are fixed sources represented by steel sintering flue gas and mobile sources represented by diesel engine exhaust.The selective catalytic reduction of NO_(x) with N_(3)(N_(3)-SCR)is the most efficient and universally used technology for removing NO_(x) currently.In practical application,N_(3)-SCR catalysts on both fixed and mobile sources will inevitably be poisoned by SO_(2),resulting in deactivation,which limits the further application of N_(3)-SCR technology.Therefore,it is very crucial to study the SO_(2) poisoning mechanism of N_(3)-SCR catalysts and develop the sulfur-tolerant N_(3)-SCR catalysts.In this review,the research progress of SO_(2)-poisoning mechanism of two different catalyst systems,metal oxide for fixed source de NO_(x) and Cu-based zeolites for mobile source deNO_(x) is introduced,and the research progress of modification methods for improving sulfur resistance on these two catalysts is also reviewed,which provides an insight into future research.

关 键 词：氮氧化物 NH3-SCR 抗硫中毒性能 金属氧化物 Cu基分子筛 

分 类 号：O643.3[理学—物理化学]