Patent ID: 8546634

Claim:
A method for production of a conjugated diolefin comprising bringing a catalyst in which an oxide is supported on a carrier into contact with a monoolefin having four carbon atoms in a fluidized bed reactor in which the catalyst and oxygen are present, wherein the method satisfies the following (1) to (3): (1) the oxide contains Mo, Bi, and Fe; (2) a reaction temperature is in a range of 300 to 420° C.; and (3) an oxygen concentration in a reactor outlet gas is in a range of 0.05 to 0.7% by volume; wherein the oxide is represented by the following empirical formula: Mo 12 Bi p Fe g A a B b C c D d E e O x wherein A is at least one element selected from the group consisting of nickel and cobalt; B is at least one element selected from alkali metal elements; C is at least one element selected from the group consisting of magnesium, calcium, strontium, barium, zinc, and manganese; D is at least one rare earth element; E is at least one element selected from the group consisting of chromium, indium, and gallium; O is oxygen; p, q, a, b, c, d, e, and x represent an atomic ratio of bismuth, iron, A, B, C, D, E, and oxygen, respectively, to 12 molybdenum atoms; 0.1≦p≦5, 0.5≦q≦8, 1.7≦a≦10, 0.02≦b≦2, 0.5≦c≦5, 0.02≦d≦5, and 0≦e≦5 are satisfied; and x is the number of oxygen atoms required for satisfying the valence requirement of the other elements present.