发明申请
US20100209327A1 STRUCTURED SCR CATALYST FOR THE REDUCTION OF NITROGEN OXIDES IN THE EXHAUST GAS FROM LEAN-BURN ENGINES USING AMMONIA AS REDUCING AGENT
有权
结构化的SCR催化剂,用于减少来自使用氨基甲酸酯作为还原剂的精馏燃烧器的排气中的氮氧化物
- 专利标题: STRUCTURED SCR CATALYST FOR THE REDUCTION OF NITROGEN OXIDES IN THE EXHAUST GAS FROM LEAN-BURN ENGINES USING AMMONIA AS REDUCING AGENT
- 专利标题(中): 结构化的SCR催化剂,用于减少来自使用氨基甲酸酯作为还原剂的精馏燃烧器的排气中的氮氧化物
-
申请号: US12307696申请日: 2007-06-06
-
公开(公告)号: US20100209327A1公开(公告)日: 2010-08-19
- 发明人: Nicola Soeger , Lothar Mussmann , Ralf Sesselmann , Katja Adelmann , Wolfgang Schneider
- 申请人: Nicola Soeger , Lothar Mussmann , Ralf Sesselmann , Katja Adelmann , Wolfgang Schneider
- 优先权: DE102006031724.6 20060708; EP06019975.9 20060925
- 国际申请: PCT/EP2007/005006 WO 20070606
- 主分类号: B01D53/56
- IPC分类号: B01D53/56 ; B01J29/072 ; B01D53/94
摘要:
The reductive removal of nitrogen oxides from the exhaust gas from internal combustion engines operated predominantly under lean conditions takes place in a selective catalytic reduction (SCR) of the nitrogen oxides by means of ammonia or a compound which can be decomposed into ammonia as reducing agent. Conventional SCR catalysts typically have a relatively narrow working temperature window, usually 350° C. to 520° C., in which good nitrogen oxide conversions can be achieved with sufficient selectivity. SCR catalyst formulations whose working window is in the temperature range from 150° C. to 350° C. generally not be used at higher temperatures since they oxidize the ammonia required as reducing 18 agent to nitrogen oxides at above 350° C. To cover the entire exhaust gas temperature range typical of vehicles having been operating internal combustion engines extending from 200° C. to 600° C., it has therefore mostly been necessary to use complicated exhaust gas systems containing a plurality of catalysts having different working temperature ranges. Disclosed is a structured SCR catalyst whose working range extends over a significantly broader temperature window and by means of which complicated exhaust gas units can be considerably simplified, with a saving of components.