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:
Oct. 25, 1994
Filed:
May. 17, 1993
Applicant:
Inventors:
Kazuhiko Shiokawa, Ichikawa, JP;
Takashi Itoh, Ichikawa, JP;
Assignee:
N.E. Chemcat Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; B01J / ;
U.S. Cl.
CPC ...
502 65 ; 502 64 ; 502 66 ;
Abstract
A catalyst for purifying exhaust gas, comprising a zeolite carrier having a mole ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of from 20 to 200, and a compound oxide of copper and silicon supported on the carrier. The catalyst has high activity for elimination of nitrogen oxides (NO.sub.x) even in the presence of both oxygen and water vapor, and also has excellent durability at high temperatures. The catalyst is therefore effective in eliminating nitrogen oxides from exhaust gases from automobiles, boilers and the like.