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:
Jul. 10, 2012
Filed:
Nov. 24, 2009
Wei LI, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Kevin L. Perry, Fraser, MI (US);
Chang H. Kim, Rochester, MI (US);
Wei Li, Troy, MI (US);
Paul M. Najt, Bloomfield Hills, MI (US);
Kushal Narayanaswamy, Sterling Heights, MI (US);
Kevin L. Perry, Fraser, MI (US);
Chang H. Kim, Rochester, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An exhaust gas aftertreatment system for treating an engine-out exhaust gas feedstream of a spark-ignition direct-injection engine includes a multi-stage catalytic converter comprising a converter inlet, a converter outlet, and a substrate having a first end associated with the converter inlet and a second end associated with the converter outlet. The substrate further includes a multiplicity of flow passages between the first and second ends of the substrate, a first surface location corresponding to the first end of the substrate, and a second surface location corresponding to the second end of the substrate. The first and second washcoat stages include washcoats formulated to generate hydrogen and ammonia from the engine-out exhaust gas feedstream. An ammonia-selective catalytic reduction device is downstream of the first and second washcoat stages.