| 摘要 |
<p>It is an object of the present invention to provide a composite oxide catalyst which can suppress the generation of CO 2 and CO and improve the yield of an unsaturated nitrile in a method for subjecting propane or isobutane to a vapor-phase catalytic ammoxidation reaction to produce a corresponding unsaturated nitrile, and a method for producing the composite oxide catalyst, and a method for producing an unsaturated nitrile using the composite oxide catalyst. A composite oxide catalyst used for a vapor-phase catalytic oxidation reaction or vapor-phase catalytic ammoxidation reaction of propane or isobutane, the composite oxide catalyst comprising a composite oxide represented by the following composition formula (1):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒMO 1 V a Sb b Nb c W d Z e O n €ƒ€ƒ€ƒ€ƒ€ƒ(1),
wherein the component Z is one or more element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; a, b, c, d, e, and n represent atomic ratios of the elements; and 0.1 ‰¤ a < 0.2, 0.15 ‰¤ b ‰¤ 0.5, 0.1 ‰¤ c ‰¤ 0.5, 0 ‰¤ d ‰¤ 0.4, 0 ‰¤ e ‰¤ 0.2, and 0.60 < a/b < 1.00.</p> |
