Pollution control catalyst for internal combustion engine exhaust system/catalytic converter and process for its preparation
AssigneePro-Catalyse
InventorsGilbert Blanchard, Jean-Pierre Brunelle, Michel Prigent
Life of this patent
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Abstract
A pollution control catalyst for a catalytic converter within the exhaust system of an internal combustion engine is facilely prepared by (i) coating/impregnating a catalyst support with palladium and at least one base metal catalyst, (ii) activating the step (i) catalyst, (iii) next coating/impregnating the step (ii) activated catalyst with at least one platinum group precious metal other than palladium, or combination of palladium and at least one other platinum group precious metal, and (iv) then activating the step (iii) catalyst.
Claims17
A process for the preparation of a catalyst composition adopted for the treatment of internal combustion engine exhaust gases, comprising (i) coating and/or impregnating a support with a catalyst of palladium and at least one base metal element, (ii) activating the step (i) catalyst at a temperature ranging from 120.degree. to 800.degree. C., (iii) next coating and/or impregnating the step (ii) activated catalyst with at least one platinum group precious metal other than palladium, or a combination of palladium and at least one other platinum group precious metal, and (iv) thence activating the step (iii) catalyst at a temperature ranging from 300.degree. to 800.degree. C.
Dependencies are inferred from the claim text.