NH_3选择性还原NO_x技术在重型柴油车尾气净化中的应用  

Selective catalytic reduction of NO_x by NH_3 for heavy-duty diesel vehicles

作　　者：刘福东[1] 单文坡[1] 潘大伟 李腾英 贺泓[1] 

机构地区：[1]中国科学院生态环境研究中心,北京100085 [2]中国重汽集团济南橡塑件有限公司,山东济南250031

出　　处：《催化学报》2014年第9期1438-1445,共8页

基　　金：国家高技术研究发展计划(863计划;2013AA065301);国家自然科学基金(51108446;51278486)~~

摘　　要：基于实验室对柴油车用V2O5-WO3/TiO2催化剂配方以及涂覆成型技术的大量研究,设计了一条产量为6000只/月的NH3选择性催化还原NOx(NH3-SCR)催化剂中试生产线,并对生产的催化剂产品进行了发动机台架测试.结果表明,实验室制备的V2O5-WO3/TiO2粉体催化剂和生产线产品,在空速为50000 h–1和200–450°C条件下NOx转化率均可达80%以上;采用大尺寸堇青石载体涂覆后制备的V2O5-WO3/TiO2整体催化剂经实验室小样测试,在空速为10000–30000h–1和250–450°C条件下NOx转化率也为80%以上.发动机台架测试结果表明,该催化剂产品可使重型柴油机NOx排放达到国IV标准中欧洲稳态循环(ESC)和欧洲瞬态循环(ETC)排放限值的要求.该生产线经适当调整后也可用于生产非钒基NH3-SCR整体催化剂,以满足未来钒基NH3-SCR催化剂更新换代的需求.A catalyst production line with a production capacity of 6000 catalyst monoliths per month for the selective catalytic reduction of NOx by NH3 （NH3-SCR） for NOx abatement in diesel vehicle exhaust was set up based on a detailed laboratory study of the catalyst formulation and washcoating tech-nology for V2O5-WO3/TiO2 catalyst. The catalyst produced by this line was tested on a bench scale diesel engine. The V2O5-WO3/TiO2 powder catalyst prepared in the laboratory and production line both achieved＆gt;80%NOx conversion at 200-450 ℃ and a GHSV of 50000 h-1. The washcoated cata-lyst used a large cordierite support and gave＆gt;80%NOx conversion at 250-450 ℃ and GHSVs of 10000-30000 h-1. The engine bench tests showed that after treatment by the catalyst, the NOx emis-sion met the European steady-state cycle （ESC） and European transient cycle （ETC） limits of the China IV standard. The production line can also be used for the production of vanadium-free NH3-SCR catalysts to meet the required replacement of the present vanadium-based NH3-SCR cata-lyst in the future.

关 键 词：柴油车尾气 氮氧化物 选择性催化还原 钒基催化剂 工业化生产 

分 类 号：TQ426.96[化学工程] X701[环境科学与工程—环境工程]