| 摘要 |
Novel oxide catalysts for production of unsaturated acids and unsaturated nitriles that exhibit high reaction performance, being capable of stably maintaining high yield for a prolonged period of time; a method of preparing them; and a process for producing unsaturated acids and unsaturated nitriles therewith. There are provided oxide catalysts of the composition formula (1): Mo<SUB>1</SUB>V<SUB>a</SUB>Sb<SUB>b</SUB>Nb<SUB>c</SUB>Mn<SUB>d</SUB>W<SUB>e</SUB>Y<SUB>f</SUB>O<SUB>n </SUB>(1) wherein Y is at least one element selected from among alkaline earth metals and rare earth metals, and each of a, b, c, d, e, f and n is the atomic ratio per mol. atom, provided that 0.1=a=1, 0.01=b=1, 0.01=c=1, 0=d=0.1, 0=e=0.1, 0<(d+e)=0.1 and 0=f=1 and n is a numeral determined depending on the atomic valence of constituent metals. |
