| 摘要 |
It is an object of the present invention to provide a mixed catalyst for a vapor-phase catalytic oxidation or a vapor-phase catalytic ammoxidation reaction of propane or isobutane, capable of providing a corresponding unsaturated acid or unsaturated nitrile at high yield from propane or isobutane. A mixed catalyst for a vapor-phase catalytic oxidation reaction or a vapor-phase catalytic ammoxidation reaction of propane or isobutane comprises:
(a) a composite oxide represented by the following composition formula (1):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒMo 1 V a Nb b Sb c W d Z e O n €ƒ€ƒ€ƒ€ƒ€ƒ(1)
wherein Z represents at least one element selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, and Ba; each of a, b, c, d, e, and n represents an atomic ratio of each element based on Mo atom; a is in a range of 0.01 ‰¤ a ‰¤ 1; b is in a range of 0.01 ‰¤ b ‰¤ 1; c is in a range of 0.01 ‰¤ c ‰¤ 1; d is in a range of 0.001 ‰¤ d ‰¤ 1; e is in a range of 0 ‰¤ e ‰¤ 1; and n represents a number determined by the valence of a component metal; and
(b) a tungsten compound at a ratio of the following formula (2): 0.001 < w < 0.3
wherein w represents an atomic ratio of tungsten in the tungsten compound as an atomic ratio based on Mo atom in the composite oxide. |
