| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel catalyst having enhanced selectivity of a target substance for manufacturing an unsaturated acid or unsaturated nitrile by the vapor phase catalytic oxidation or ammoxidation of propane or isobutane. <P>SOLUTION: The catalyst is an oxide having a component composition expressed by general formula (1) and the content of metal element Z (where, Z expresses at least a kind of an element selected from copper, solver and tantalum) is ≤1000 ppm by wt. Mo<SB>1</SB>V<SB>a</SB>Nb<SB>b</SB>X<SB>c</SB>O<SB>n</SB>(1). In formula (1), X expresses at least one kind of an element selected from tellurium and antimony, each of (a), (b), (c) and (n) expresses an atomic ratio per one atom of Mo, (a) is 0.01≤a≤1, (b) is 0.01≤b≤1, (c) is 0.01≤c≤1 and (n) is determined on the basis of the valencies and the composition of constitutional metal. <P>COPYRIGHT: (C)2003,JPO |
