Diesel engine exhaust gas-purifying catalyst
AssigneeNippon Shokubai Co., Ltd.
InventorsMakoto Horiuchi, Koichi Saito
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Abstract
There is provided a Diesel engine exhaust gas-purifying catalyst which comprises (1) a catalytic component comprising titania having dispersed and deposited thereon at least one noble metal selected from palladium, platinum and rhodium, and (2) a refractory three dimensional structure as a carrier. This catalyst is excellent in the performance of removal by combustion at low temperature of harmful components such as uncalcined hydrocarbons and carbon monoxide in addition to carbonic fine particles, and moreover has only low ability to oxide sulfur dioxide, whereby formation of sulfates can be inhibited.
Claims5
A diesel engine exhaust gas-purifying catalyst which comprises a refractory three dimensional structure having deposited thereon a catalytic component comprising titania having dispersed and deposited thereon at least one noble metal selected from the group consisting of palladium, platinum and rhodium, and at least one additional element selected from the group consisting of scandium, yttrium, rare earth elements, alkali metals, alkaline earth metals, gold, silver, copper and zinc, said titania having a specific surface area in the range of 1 to 60 m.sup.2 /g, and said additional element being deposited in an amount of 1.5 to 12 g per liter of the refractory three dimensional structure.
Dependencies are inferred from the claim text.