Perovskite-based catalysts, catalyst combinations and methods of making and using the same
AssigneeGM Global Technology Operations LLC
InventorsWei Li, David B. Brown, Chang H Kim, Gongshin Qi, Steven J. Schmieg
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Abstract
One embodiment of the invention may include a method comprising providing a product comprising a substrate comprising a perovskite catalyst, NOx stored in or on the substrate and particulate matter in or on the substrate; releasing at least some of the stored NOx and oxidizing the released NOx to form NO2, and reacting the NO2 with carbon in the particulate matter to form at least one of CO or CO2.
Claims22
A product comprising:
- a combustion engine and exhaust treatment system wherein the combustion engine produces exhaust comprising particulate matter and NOx, the system comprising an engine and a catalytic converter downstream of the engine;
- a combination particulate filter and NOx storage component;
- the particulate filter comprising a perovskite catalyst and a NOx storage material, and constructed and arranged so that particulate matter from the combustion engine exhaust is trapped in the particulate filter and NOx is stored in the NOx storage material wherein the particulate filter comprises a second non-perovskite catalyst comprising platinum and the perovskite catalyst comprises an alkaline earth metal.
A product comprising a combination of particulate filter and NOx storage component;
- the particulate filter comprising a perovskite catalyst and a NOx storage material, and constructed and arranged so that particulate matter from combustion engine exhaust is trapped particulate filter and NOx is stored in the NOx storage material wherein the particulate filter comprises a second non-perovskite catalyst comprising platinum and the perovskite catalyst comprises an alkaline earth metal.
A method comprising providing a product comprising a particulate filter comprising a substrate comprising perovskite catalyst, NOx stored in or on the substrate and particulate matter in or on the substrate;
- releasing at least some of the stored NOx and oxidizing the released NOx to form NO2, and reacting the NO2 with carbon in the particulate matter to form at least one of CO or CO2 wherein the product comprises a second non-perovskite catalyst comprising platinum and the perovskite catalyst comprises an alkaline earth metal.
A method comprising providing a particulate filter comprising a substrate comprising a perovskite catalyst, NOx stored in or on the substrate and particulate matter in or on the substrate;
- releasing at least some of the stored NOx and oxidizing the released NOx to form NO2, and reacting the NO2 with carbon in the particulate matter to form at least one of CO or CO2 wherein the particulate filter comprises a second non-perovskite catalyst comprising platinum and the perovskite catalyst comprises an alkaline earth metal.
A product comprising a particulate filter and NOx trap combination, wherein the particulate filter comprises a substrate constructed and arranged to trap particulate matter in a gas stream flowing in, through or over the substrate, and further comprising a trap material in, on or over the substrate and a perovskite catalyst in, on or over the substrate wherein the particulate filter and NOx trap combination comprises a second non-perovskite catalyst comprising platinum and the perovskite catalyst comprises an alkaline earth metal.
Dependencies are inferred from the claim text.