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. 21, 1996
Filed:
Jul. 11, 1994
Applicant:
Inventors:
Assignee:
N. E. Chemcat Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ; C01B / ;
U.S. Cl.
CPC ...
502 66 ; 502 71 ; 502 74 ; 502 77 ; 423713 ;
Abstract
A catalyst for purifying exhaust gas comprising crystalline iridium silicate having a Si/Ir atomic ratio of 50 to 800 and a Si/Al atomic ratio of not less than 15. The catalyst exhibits excellent activity and selectivity when used for purification of, and specifically for eliminating NOx from, an exhaust gas which contains reducing components including hydrocarbons, oxygen in excess of the stoichiometric quantity necessary for completely oxidizing all of the reducing components, and nitrogen oxides. The catalyst is highly durable to hydrothermal aging.