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EXHAUST AFTERTREATMENT SYSTEM

United States Patent Application

20100192545
A1
View the Complete Application at the US Patent & Trademark Office
An exhaust aftertreatment system connected to an internal combustion engine operative lean of stoichiometry includes first and second selective catalytic reactor devices. A preferred ratio of hydrocarbon:NOx to achieve a preferred concentration of ammonia immediately downstream of the first selective catalytic reactor device is determined. An ethanol-based reductant is dispensed upstream of the first selective catalytic reactor device.
Schmieg, Steven J. (Troy, MI), Sloane, Thompson M. (Oxford, MI)
GM GLOBAL TECHNOLOGY OPERATIONS, INC. (Detroit MI)
12/ 363,054
January 30, 2009
GOVERNMENT CONTRACT RIGHTS [0001] The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of DE-FC26-02NT41218 awarded by the U.S. Department of Energy.