Patent ID: 9694352
Date: 2017-07-04
CPC Classifications: B01D,B01J,C01B,Y02T

Claim:
1. A method of treating engine exhaust, the method comprising contacting said engine exhaust with a catalyst at a temperature of 150° C., and optionally at a subsequent temperature above 150° C., in the presence of an ammonia reductant, wherein said catalyst comprises a heterobimetallic zeolite characterized by a chabazite structure loaded with copper ions and at least one trivalent metal ion other than Al 3+ , wherein said copper ions are present in said catalyst in a loading amount of above 1 wt % and said at least one trivalent metal ion other than Al 3+ is present in said catalyst in a loading amount of less than 1 wt %, and said copper and trivalent metal ion loading amounts are effective to achieve a NO x conversion at 150° C. of at least 50% in the presence of said ammonia reductant.