发明名称 |
STRUCTURED SCR CATALYST FOR THE REDUCTION OF NITROGEN OXIDES IN THE EXHAUST GAS FROM LEAN-BURN ENGINES USING AMMONIA AS REDUCING AGENT |
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.
|
申请公布号 |
US2010209327(A1) |
申请公布日期 |
2010.08.19 |
申请号 |
US20070307696 |
申请日期 |
2007.06.06 |
申请人 |
SOEGER NICOLA;MUSSMANN LOTHAR;SESSELMANN RALF;ADELMANN KATJA;SCHNEIDER WOLFGANG |
发明人 |
SOEGER NICOLA;MUSSMANN LOTHAR;SESSELMANN RALF;ADELMANN KATJA;SCHNEIDER WOLFGANG |
分类号 |
B01D53/56;B01D53/94;B01J29/072 |
主分类号 |
B01D53/56 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|