| abstract |
It is an object of the present invention to provide a mixture catalyst capable of obtaining a high yield of a corresponding unsaturated acid or unsaturated nitrile from propane or isobutane as a catalyst for vapor phase catalytic oxidation or gas phase catalytic ammoxidation reaction of propane or isobutane. The present invention is a mixture catalyst for vapor phase catalytic oxidation reaction or gas phase catalytic ammoxidation reaction of propane or isobutane, and a mixture containing a complex oxide represented by the following formula (1) and a tungsten compound in the ratio of formula (2) Relates to a catalyst; Mo 1 V a Nb b Sb c W d Z e O n (1) [In Formula (1), Z is at least one or more elements selected from the group consisting of La, Ce, Pr, Yb, Y, Sc, Sr, Ba, a, b, c, d, e, n is Mo 1 Represents the atomic ratio of each element per atom, a is 0.01≤a≤1, b is 0.01≤b≤1, c is 0.01≤c≤1, d is 0.001≤d≤1, e is 0≤e≤1 and n represents the number determined by the valence of the constituent metal.] 0.001 <w <0.3 (2) [In Formula (2), w represents the atomic ratio of tungsten in a tungsten compound as an atomic ratio per Mo1 atom in a composite oxide.]. |