| 摘要 |
PROBLEM TO BE SOLVED: To provide a catalyst for exhaust gas purification that has high durability to heat, by impregnating an inorganic oxide carrier successively with three catalytic components; a copper compound, an alkali metal compound, and a molybdenum compound; in this order, drying and then firing the resultant carrier. SOLUTION: Titania, alumina, etc., are used for the inorganic oxide as a carrier and the particle size of the inorganic oxide to be used is preferably 100 μm or smaller, further preferably within a range from 0.1 to 10 μm. A nitrate as a copper compound, a nitrate or carbonate as an alkali metal compound, and further ammonium molybdate as a molybdenum compound are deposited on such an inorganic oxide carrier. A method to be generally employed for producing this exhaust gas purifying catalyst includes processes of impregnating the inorganic oxide carrier with respective aqueous solutions of above mentioned copper compound, alkali metal compound, and molybdenum compound in this order at the time when the catalytic components are deposited on the inorganic oxide carrier, and then drying the resultant carrier and successively firing the carrier. |
