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. 24, 2013
Filed:
Sep. 14, 2010
Wei LI, Troy, MI (US);
Chang H Kim, Rochester, MI (US);
Kevin L. Perry, Fraser, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Wei Li, Troy, MI (US);
Chang H Kim, Rochester, MI (US);
Kevin L. Perry, Fraser, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An exhaust aftertreatment system that receives an exhaust flow from a lean-burn engine and a method for treating the exhaust flow are described. The exhaust aftertreatment system may include a three-way-catalyst, an oxidation catalyst, and a NH—SCR catalyst. The three-way-catalyst passively generates NHfrom native NOcontained in the exhaust flow when an A/F mixture supplied to the engine is cycled from lean to rich. The generated NHis then stored in the NH—SCR catalyst to facilitate NOreduction when the A/F mixture supplied to the engine is cycled back to lean. The oxidation catalyst is located upstream of the NH—SCR catalyst and operates to lower the NO to NOmolar ratio of the NOfed to the NH—SCR catalyst. The oxidation catalyst comprises perovskite oxide particles.