铜基菱沸石催化剂——适用于未来中国柴油车排放法规的选择性催化还原技术  

Cu-Chabazite Catalyst—The SCR Technology to Help Meet Future China's Diesel Vehicle Emission Regulations

作　　者：杨晓帆 唐为勇 陈海波 斯坦.罗斯 

机构地区：[1]美国巴斯夫公司,伊瑟琳08830 [2]中国巴斯夫(上海)催化剂有限公司,上海201206

出　　处：《内燃机工程》2016年第6期72-78,共7页Chinese Internal Combustion Engine Engineering

摘　　要：详细介绍了更严NOx的排放要求带来的挑战及基于小孔分子筛(菱沸石)的铜基SCR催化剂技术(Cu-CHA),然后研究了催化剂的老化因素(如碳氢中毒、水热老化和硫中毒等)对该催化剂的影响,并通过试验对比研究了钒基SCR和大孔铁基分子筛(Fe-Beta)SCR技术,表明此Cu-CHA选择性还原技术具有优异的低温活性,并且该技术具有极高的热老化稳定性,对碳氢及硫中毒和中毒不太敏感。此外,介绍了铜基SCR在柴油车后处理上的不同应用,包括重柴柴油车DOC+CSF+Cu-SCR系统及轻型柴油车DOC+SCRoF系统等,认为Cu-CHA技术能够满足中国第六阶段排放法规提出的更严格的NOx的排放要求,且该技术安全又具有持续性。In view of china＇s increasingly stringent emission regulations will bring new challenges to reduce NOx emissions the technical characteristics of the Cu- CHA catalyst, and the effect of its deactivation factors （e. g., hydrocarbon poisoning, hydrothermal aging, sulfur poisoning, etc. ）on the catalyst, as well as an experimental comparison between vanadium-based SCR and large pore iron zeolite （Fe-Beta） SCR technology are elaborated. It show that use of Chabazite zeolite Cu-SCR （Cu-CHA） strategies has excellent low temperature activity and very high thermal aging stibitity with less susceptibility to sulfur and hydrocarbon poisoning. Also, the extensive application of Cu-CHA technology in exhausit after-treatment systems of diesel vehicles has been discussed, including （DOC＋CSF＋Cu-SCR）system for heavy duty dicsel vehicles and （DOC ＋SCRoF） system for light duty diesel vehicles. It is concluded that the Cu-CHA strategies can offer a superior solution to help meet stringent NOx emission of china＇s stage TV emission regulations without compromising safety and sustainability.

关 键 词：内燃机 柴油机后处理 尿素SCR 选择性催化还原 铜基菱沸石 分子筛 脱硝 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]