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:
Sep. 22, 2015
Filed:
Mar. 30, 2012
Chang H Kim, Rochester, MI (US);
Gongshin Qi, Troy, MI (US);
Chang H Kim, Rochester, MI (US);
Gongshin Qi, Troy, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Particles of mixed oxides of cerium, zirconium, and copper (CeZrCuO) may be prepared as catalysts and used to preferentially catalyze the oxidation of CO in exhaust streams containing CO and NH. In one practice, this CeZrCuOcatalyst may be used in combination with a close-coupled PGM catalyst which promotes the formation of NHin the exhaust during fuel-rich operation, and at least one under-floor NH-SCR catalyst, which catalyzes the reduction of NOin the exhaust stream during fuel-lean operation using NHas a reductant. During fuel-rich engine operation, the exhaust stream may be doped with oxygen downstream of the PGM catalyst and passed in contact with particles of the CeZrCuOcatalyst so that residual CO in the exhaust may be oxidized to CO, without oxidation or other conversion of the NH.