| abstract |
PROBLEM TO BE SOLVED: To provide a high-strength, silica-supported catalyst and unsaturated catalyst for producing unsaturated nitriles by ammoxidation reaction of propane or isobutane in gas phase contact with ammonia and oxygen. High nitrile yield, In addition, the present invention provides a catalyst that suppresses the decomposition of ammonia into nitrogen and has a high use efficiency of ammonia without going through a complicated catalyst production process. SOLUTION: It is supported on 20 to 60% by weight of silica, Formula Mo 1 is and chemical composition other than silica V p X q Nb r Y s Z t O represented by n, and propane or isobutane to gas phase catalytic ammoxidation, the catalyst used for producing an unsaturated nitrile, wherein, X is Te and / or Sb, Y is Ce and / or La Yes, 0.1 ≦ p ≦ 0.6, 0. 01 ≦ q ≦ 0.6, 0.01 ≦ r ≦ 0.6, 0.001 ≦ s ≦ 0.3, 0 ≦ t ≦ 1, and n is the atomic ratio of oxygen determined by the oxidation number of the constituent metal element. |