Inventors:
Albert N Chigapov - Aachen, DE
Alexei A Dubkov - Aachen, DE
Brendan Patrick Carberry - Aachen, DE
Robert Walter McCabe - Lathrup Village MI, US
Assignee:
Ford Global Technologlies, LLC. - Dearborn MI
International Classification:
B01J 23/00, B01J 23/58, B01J 23/72, B01J 23/70, B01J 23/74
US Classification:
502302, 502303, 502304, 502314, 502317, 502318, 502330, 502331, 502338, 502347, 502525
Abstract:
The present invention provides new platinum group metal (“PGM”) free catalytic compositions that comprise silver and/or cobalt stabilized ceria. These compositions facilitate soot oxidation during the regeneration of diesel particulate filters (DPF) thereby replacing PGM formulations. The compositions of the invention are particularly useful as washcoat compositions for DPFs as part of an automotive after-treatment system. Among the formulations tested, the silver-stabilized ceria and cobalt-stabilized ceria formulations e. g. can oxidize soot at 250–300° C. in the presence of NOand oxygen, while silver-stabilized ceria can oxidize diesel soot even in the presence of oxygen as the sole oxidizing agent at these temperatures. A perovshite composition containing Ag—La—Mn was very active at temperatures above 300° C.