| abstract |
A catalyst for a fluidized bed ammoxidation reaction containing silica and a metal oxide, wherein a composite of the silica and the metal oxide is represented by the following formula (1). n Mo 12 Bi a Fe b Ni c Co d Ce e Cr f X g O h /(SiO 2 ) A (1)n (in formula (1), X represents at least one element selected from the group consisting of K, Rb, and Cs, 0.1≤a≤1, 1≤b≤3, 1≤c≤6.5, 1≤d≤6.5, 0.2≤e≤1.2, f≤0.05, and 0.05≤g≤1 are satisfied, h satisfies valences of constituent elements excluding silica, A represents a content of silica (% by mass) and satisfies 35≤A≤48, and values of α, β, and γ calculated from the following expressions (2), (3), and (4) satisfy 0.03≤α≤0.08, 0.2≤β≤0.4, and 0.5≤γ≤2.) nn α=1.5 a /(1.5( b+f )+ c+d ) (2)n n β=1.5( b+f )/( c+d ) (3)n n γ= d/c (4) |