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AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsJun Fujii, Kazunori Suzuki, Kazuo Kimura
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A catalyst for cleaning exhaust gas comprises a carrier and a coated layer applied onto the surface of the carrier which comprises an aluminum oxide, a cerium oxide, a zirconium oxide, a nickel oxide, an alkaline earth metal oxide and a noble metal catalytic component. The catalyst can be prepared according to a method which comprises the steps of coating the surface of a carrier with a slurry which comprises active alumina, a cerium compound, a zirconium compound and a nickel compound, drying the coated carrier and then calcining it to complete the carrier, then impregnating the carrier with a solution comprising a catalyst component of a noble metal, drying, then immersing it in a solution of an alkaline earth metal compound, drying the immersed carrier and then calcining the carrier. The catalyst for exhaust gas-cleanup is highly sensitive to HC and CO around the theoretical mixing ratio and within the rich-region and is excellent in durability.
A catalyst for cleaning exhaust gas consisting essentially of a carrier and a coated layer applied onto the surface of the carrier, which coated layer consists essentially of an aluminum oxide, a cerium oxide, a zirconium oxide, a nickel oxide, an alkaline earth metal oxide and a noble metal catalytic component, said catalyst being prepared by the steps of coating the surface of a carrier with a slurry which consists essentially of active alumina, a cerium compound, a zirconium compound and a nickel compound, drying the coated carrier and then calcining the dried coated carrier to complete the carrier, then impregnating the completed carrier with a solution consisting essentially of a catalyst component of a noble metal, drying the impregnated carrier, then immersing the dried impregnated carrier in a solution of an alkaline earth metal compound, drying the immersed carrier and then calcining the dried immersed carrier.
A method for preparing a catalyst for cleaning exhaust gas comprising the steps of coating the surface of a carrier with a slurry which comprises active alumina, a cerium compound, a zirconium compound and a nickel compound, drying the coated carrier and then calcining the dried coated carrier to complete the carrier, then impregnating the completed carrier with a solution comprising a catalyst component of a noble metal, drying, the impregnated carrier then immersing the impregnated carrier in a solution of an alkaline earth metal compound, drying the immersed carrier and then calcining the dried immersed carrier.
Dependencies are inferred from the claim text.