宽温稀土基SCR脱硝催化剂研究进展  

Research progress on rare earth-based catalysts for SCR with wide temperature window

作　　者：于威威 刘优林 沈岳松[1] Yu Weiwei;Liu Youlin;Shen Yuesong(School of Materials Science and Engineering,Nanjing University of Technology,Nanjing 211816,Jiangsu,China)

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京211816

出　　处：《工业催化》2024年第5期26-32,共7页Industrial Catalysis

基　　金：国家重点研发计划项目(2022YFB3504102)。

摘　　要：氮氧化物(NO_(x))是雾霾、酸雨和臭氧的重要前体物,燃煤电厂等固定源和柴油车等移动源的烟气脱硝迫在眉睫。氨气选择性催化还原技术(NH3-SCR)是目前最有效的烟/尾气脱硝技术。为满足NO_(x)排放标准,NH3-SCR催化剂需在较宽温度范围内具有高效的脱硝活性和稳定性。稀土材料因独特的电子结构,可调节的表面酸性和氧化还原性,在脱硝领域应用前景广泛。综述中低温及中高温稀土基金属氧化物SCR脱硝催化剂最新研究进展,分子筛SCR脱硝催化剂制备方法,包括离子交换法、一锅法及绿色合成法,并总结了目前宽温SCR催化剂的研究热点及挑战。Nitrogen oxides(NO_(x))are important precursors of haze,acid rain and ozone,and flue gas denitrification of stationary sources such as coal-fired power plants and mobile sources such as diesel vehicles is imminent.Ammonia selective catalytic reduction(NH 3-SCR)is currently the most effective flue gas/exhaust denitrification technology.In order to meet NO_(x) emission standards,NH 3-SCR catalysts need to have efficient denitrification activity and stability over a wide temperature range.Rare earth materials have a wide range of applications in denitrification due to their unique electronic structure,adjustable surface acidity and redox properties.The latest research progress of medium-low and medium-high temperature rare earth-based metal oxide SCR denitrification catalysts,the preparation methods of molecular sieve SCR denitrification catalysts,including ion exchange method,one-pot method and green synthesis method,are reviewed,and the current research hotspots and challenges of wide-temperature SCR catalysts are summarized.

关 键 词：催化剂工程 宽温度窗口 稀土基脱硝催化剂 金属氧化物 分子筛 

分 类 号：TQ426.6[化学工程] X701[环境科学与工程—环境工程]