B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
172/4, 252/48, 2
B01J 23/89 (2006.01) B01D 53/94 (2006.01) B01J 23/56 (2006.01) B01J 23/63 (2006.01) B01J 37/02 (2006.01)
Patent
CA 1335890
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 NOx, after extensive durability testing and also minimizes the formation of H2S.
613545
Alliedsignal Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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