04923842 is referenced by 53 patents and cites 15 patents.

This invention relates to an improved catalytic composite for treating an exhaust gas comprising a first support which is a refractory inorganic oxide, having dispersed thereon at least one oxygen storage component and at least one noble metal component and having dispersed immediately thereon an overlayer comprising lanthanum oxide and optionally a second support which is a refractory inorganic oxide. The first and second support may be selected from the group consisting of alumina, silica, titania, zirconia and aluminosilicates with alumina being preferred. Additionally, the noble metal component may be selected from the group consisting of platinum, palladium, rhodium, ruthenium and iridium. The oxygen storage component is an oxide of a metal which includes cerium, iron, nickel, cobalt lanthanum, neodymium, praesodymium, etc. and mixtures thereof. This invention also relates to a process for treating automotive exhaust comprising contacting the exhaust with the catalytic composite described above.

The catalytic composite shows improved activity, especially for eliminating NO.sub.x, after extensive durability testing and also minimizes the formation of H.sub.2 S.

Title
Lanthanum containing catalyst for treating automotive exhaust
Application Number
7/255245
Publication Number
4923842
Application Date
October 11, 1988
Publication Date
May 8, 1990
Inventor
Jack C Summers
Tulsa
OK, US
Agent
Roger H Criss
Harold N Wells
Frank S Molinaro
Assignee
Allied Signal
NJ, US
IPC
B01J 23/10
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