The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2012
Filed:
Mar. 09, 2007
Haren S. Gandhi, West Bloomfield, MI (US);
John Vito Cavataio, Dearborn, MI (US);
Robert Henry Hammerle, Franklin, MI (US);
Yisun Cheng, Ann Arbor, MI (US);
Haren S. Gandhi, West Bloomfield, MI (US);
John Vito Cavataio, Dearborn, MI (US);
Robert Henry Hammerle, Franklin, MI (US);
Yisun Cheng, Ann Arbor, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
This catalyst system simultaneously removes ammonia and enhances net NO, conversion by placing an NH-SCR catalyst formulation downstream of a lean NOtrap. By doing so, the NH-SCR catalyst adsorbs the ammonia from the upstream lean NOtrap generated during the rich pulses. The stored ammonia then reacts with the NOemitted from the upstream lean NOtrap—enhancing the net NOconversion rate significantly, while depleting the stored ammonia. By combining the lean NOtrap with the NH-SCR catalyst, the system allows for the reduction or elimination of NHand NOslip, reduction in NOspikes and thus an improved net NOconversion during lean and rich operation.