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:
May. 29, 2012
Filed:
Jul. 30, 2007
Naohiro Satoh, Saitama, JP;
Osami Yamamoto, Saitama, JP;
Koichi Inaba, Saitama, JP;
Hiroshi Ohno, Saitama, JP;
Naohiro Satoh, Saitama, JP;
Osami Yamamoto, Saitama, JP;
Koichi Inaba, Saitama, JP;
Hiroshi Ohno, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A NOreduction system comprises NOtreatment catalyst and air-fuel ratio control switch for changing the air-fuel ratio of an exhaust gas to a lean or rich state. The NOtreatment catalyst comprises at least a first catalyst layer containing a solid acid catalyst capable of adsorbing ammonia and a second catalyst layer containing a noble metal and a cerium oxide material. The second and the first catalyst layer are stacked in that order on a carrier, and the first catalyst layer constitutes the uppermost layer. NOis passed through the first catalyst layer in the lean state and is temporarily stored in the second catalyst layer. Thereafter, in the rich state, NOis converted to NHand is restored in the first catalyst layer. When the state is again returned to the lean state, NHis converted to nitrogen which is finally released from the first catalyst layer.