| 摘要 |
A novel catalyst extremely useful for gas phase oxidation reaction of an unsaturated aldehyde, particularly acrolein or methacrolein, to a corresponding unsaturated carboxylic acid, particularly acrylic or methacrylic acid, which is represented by the general formula: PaMobVcCudSbeAgfXgYhOi, wherein X represents at least one element selected from among potassium, rubidium, cesium, and thallium, Y represents at least one element selected from among zinc, sulfur, chromium, silicon, germanium, zirconium, tin, selenium, tungsten, tantalum, tellurium, nickel, barium, bismuth, arsenic, boron, magnesium, rhodium, and palladium, a, b, c, d, e, f, g, h, and i represent atomic ratios of respective elements, provided that a = 0.3 to 3 , c = 0.01 to 3, d = 0.01 to 3, e = 0.01 to 3, f = 0.001 to 2, g = 0.01 to 3 and h = 0.001 to 8, when b = 12, and i represents the number of oxygen atoms necessary for satisfying the valence of each component. |
