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:
Mar. 11, 1997
Filed:
Jun. 05, 1995
Takashi Itoh, Ichikawa, JP;
Yukio Kosaki, Ichikawa, JP;
Takeshi Chonan, Ichikawa, JP;
Takashi Matsuda, Ichikawa, JP;
Yasuharu Kanno, Ichikawa, JP;
Masao Wakabayashi, Chiba, JP;
Makoto Nakamura, Ichikawa, JP;
N.E. Chemcat Corporation, Tokyo, JP;
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
Abstract
A NO.sub.x removal catalyst resistant to high temperatures, comprising an activated alumina wherein the specific surface area measured by the nitrogen adsorption method is 120 m.sup.2 /g or more, the bulk density measured by the mercury porosimetry is 0.60 g/cm.sup.3 or more, and the skeleton density measured by the mercury porosimetry is 1.80 g/cm.sup.3 or less and silver carried on said activated alumina. Then said catalyst or a structure having said catalyst coated on a substrate is brought in contact with exhaust gas from an internal combustion engine that is operated at a lean fuel/air ratio, such as a lean-burn engine, NO.sub.x can be removed efficiently within a quite short contact time.