DUAL CATALYST NOX REDUCTION SYSTEM FOR LEAN BURN INTERNAL COMBUSTION ENGINES EXHAUST
摘要
<p>A method and apparatus for reducing the percentage of nitrogen dioxide and nitrogen monoxide in an exhaust gas stream of an internal combustion engine, comprising the steps of injecting a hydrocarbon compound and optionally hydrogen into the exhaust gas stream; passing the exhaust gas through a first catalyst for selective reduction of a portion of the nitrogen oxides to nitrogen, ammonia, and N-containing species; passing the exhaust gas through a second catalyst for selective reduction of a portion of the nitrogen oxides with ammonia to molecular nitrogen; sensing ammonia concentration in the exhaust gas stream after passage through either or both of the first and second catalysts; and controlling by a controller in a feedback loop the injecting to an amount of hydrocarbon that will produce a predetermined concentration of ammonia and nitrogen oxides at the sensor that will lead to high NOx conversion.</p>
申请公布号
EP2313621(A1)
申请公布日期
2011.04.27
申请号
EP20090795046
申请日期
2009.07.07
申请人
DELPHI TECHNOLOGIES, INC.
发明人
FISHER, GALEN, B.;DIMAGGIO, CRAIG, L.;RAHMOELLER, KEN, M.;SELLNAU, MARK, C.