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AssigneeFord Global Technologlies, LLC.
InventorsAlbert N Chigapov, Alexei A Dubkov, Brendan Patrick Carberry, Robert Walter McCabe
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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 NO2 and 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.
A platinum-group-metal free catalytic composition comprising a perovskite having formula AgxLa1−xMnOy, wherein x is from about 0.02 to about 0.9 and y is a number that satisfies the valency of metal atoms in the perovskite so that the perovskite is neutral, wherein the Ag and La in the perovskite are partially substituted with Sr and the Mn in the perovskite is partially or completely substituted with Cu, Co, Fe or Cr.
A platinum-group-metal free catalytic composition comprising a component selected from the group consisting of silver stabilized ceria, cobalt stabilized ceria, and mixture thereof present in an amount from about 5 mol. % to about 90 mol. %.
Dependencies are inferred from the claim text.