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Catalysts to reduce NO.sub.x in an exhaust gas stream and methods of preparation

United States Patent

May 17, 2011
View the Complete Patent at the US Patent & Trademark Office
Catalysts, systems and methods are described to reduce NO.sub.x emissions of an internal combustion engine. In one embodiment, an emissions treatment system for an exhaust stream is provided having a catalyst comprising silver and a platinum group metal on a particulate alumina support, the atomic fraction of the platinum group metal being less than or equal to about 0.25. Methods of manufacturing catalysts are described in which silver is impregnated on alumina particles.
Castellano; Christopher R. (Ringoes, NJ), Moini; Ahmad (Princeton, NJ), Koermer; Gerald S. (Basking Ridge, NJ), Furbeck; Howard (Hamilton, NJ), Schmieg; Steven J. (Troy, MI), Blint; Richard J. (Shelby Township, MI)
BASF Corporation (Florham Park, NJ)
11/ 533,593
September 20, 2006
GOVERNMENT CONTRACT RIGHTS 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.