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, 2001
Filed:
Jul. 17, 1998
Kojiro Okude, Hitachi, JP;
Hidehiro Iizuka, Hitachinaka, JP;
Osamu Kuroda, Hitachi, JP;
Ryouta Doi, Naka-machi, JP;
Toshio Ogawa, Takahagi, JP;
Hisao Yamashita, Hitachi, JP;
Shigeru Azuhata, Hitachi, JP;
Yuichi Kitahara, Hitachinaka, JP;
Toshifumi Hiratsuka, Hitachinaka, JP;
Norihiro Shinotsuka, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An apparatus and method of highly efficiently purifying nitrogen oxides are provided. An NOx chemisorption reduction catalyst chemically absorbs NOx under a condition that an exhaust gas of an internal combustion engine is an oxidizing atmosphere and deoxidizes adsorbed NOx under a reducing atmosphere. An SOx absorbent absorbs SOx contained in the exhaust gas of the oxidizing atmosphere, and deoxidizes and release SOx absorbed in the reducing atmospheric exhaust gas. The catalyst and absorbent are arranged in the exhaust path to purify the exhaust gas while preventing or suppressing SOx-poisoning of the NOx chemisorption reduction catalyst.