Catalyst for purifying exhaust gas from vehicles
AssigneesNippon Soken, Inc., Nippondenso Co., Ltd.
InventorsMitsuru Asano, Minoru Ohta, Masami Oki
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Abstract
A catalyst for purifying exhaust gas from vehicles comprises a monolithic carrier having a plurality of exhaust gas passages penetrating through the carrier, a layer of active refractory metallic oxide such as .gamma.-alumina, containing 1 to 20% by weight of a catalytic metal such as platinum deposited as first layer on inside surfaces of said plurality of the passages, and a layer of exhaust gas-permeable refractory metallic oxide such as .gamma.-alumina free from a catalytic metal deposited as an outermost layer further upon the first layer.
Claims10
A catalyst for purifying exhaust gas from vehicles, which comprises a monolithic carrier having a plurality of exhaust gas passages penetrating through the carrier, a layer of active refractory metallic oxide selected from the group consisting of .gamma.-alumina, magnesium oxide, beryllium oxide and thorium oxide containing a catalytic metal of the platinum group deposited as first layer on inside surfaces of said plurality of the passages, and a layer of exhaust gas-permeable refractory metallic oxide selected from the group consisting of .gamma.-alumina, magnesium oxide, beryllium oxide, thorium oxide, lanthanum oxide, barium oxide and lithium oxide free from said catalytic metal deposited as an outermost layer
Dependencies are inferred from the claim text.