| abstract |
The present invention relates to the method for the perovskite-based catalyst of coating, catalyst combination and process gas stream.A kind of embodiment of the present invention comprises the method for process gas stream, and the method comprises and first gas stream flow through hydrocarbon and reduce and NOn x reducing catalyst, flows through gas for NO subsequentlyn x the perovskite of oxidation and storage and NOn x material for trapping.In one embodiment, hydrocarbon reduces and NOn x reducing catalyst can comprise palladium.In one embodiment, perovskite catalyst can have general formula ABOn 3 , AA ' BOn 3 , ABB ' On 3 or AA ' BB ' On 3 .Perovskite catalyst can be unique catalyst, or the second non-perovskite catalyst can comprise palladium, platinum, rhodium, ruthenium or comprise the antigravity system of above-mentioned one or more or its alloy.In one embodiment, NOn x material for trapping can comprise at least one in alkali metal, alkaline-earth metal such as barium, calcium, potassium or sodium. |