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US 6,555,081 B2Granted
Method of the purification of the exhaust gas from a lean-burn engine using a catalyst
AssigneesICT Co., Ltd., International Catalyst Technology, Inc.
InventorsMasao Hori, Makoto Horiuchi
Life of this patent
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Abstract
A catalyst for purifying the exhaust gas from a lean-burn engine, which includes a refractory inorganic oxide carrying platinum thereon, a cerium-containing oxide carrying palladium thereon, and an alkali metal compound and/or an alkaline earth metal compound, and a method for the production of the catalyst.
Claims16
A method for the purification of the exhaust gas from a lean-burn engine run at an air/fuel ratio of not less than 15 using a catalyst, bringing the exhaust gas into contact with the catalyst comprising, as components,
- (i) a refractory inorganic oxide having platinum carried partly or wholly thereon,
- (ii) a cerium-containing oxide having palladium carried partly or wholly thereon, and
- (iii) at least one member selected from the group consisting of an alkali metal compound and an alkaline earth metal compound,
- wherein substantially no other noble metal is contained, except for platinum and palladium.
1 more element
Dependencies are inferred from the claim text.