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A process for producing an antimony-containing oxide catalyst supported on silica for use in a fluidized bed reaction is described, by the steps of preparing a slurry containing an antimony compound, a polyvalent metal compound, and silica sol as the essential ingredients, heat treating the slurry a

A process for producing an antimony-containing oxide catalyst supported on silica for use in a fluidized bed reaction is described, by the steps of preparing a slurry containing an antimony compound, a polyvalent metal compound, and silica sol as the essential ingredients, heat treating the slurry at a pH of 7 or less and at a temperature of 40°C. or higher, and thereafter spray-drying the slurry and calcining the dried particles, wherein said silica sol has a multi-peak particle size distribution profile that is derived by using a mixture of silica sol A in an amount corresponding to form 10 to 90 wt % of the total silica in the catalyst and silica sol B in an amount corresponding to 90 to 10 wt % of the total silica in the catalyst, with silica sols A and B having different average particle sizes, provided that the relations 3mm

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In a process for producing an antimony-containing oxide catalyst supported on silica for use in a fluidized bed reaction by the steps of preparing a slurry containing an antimony compound, a polyvalent metal compound, and a silica sol as the essential ingredients, heat treating the slurry at a pH of

In a process for producing an antimony-containing oxide catalyst supported on silica for use in a fluidized bed reaction by the steps of preparing a slurry containing an antimony compound, a polyvalent metal compound, and a silica sol as the essential ingredients, heat treating the slurry at a pH of 7 or less and at a temperature of 40°C. or higher, and thereafter drying the slurry and calcining the dried particles, the improvement wherein said silica sol has a multi-peak particle size distribution profile that is derived by using a mixture of silica sol A in an amount corresponding to from 10 to 90 wt% of the total silica in the catalyst and silica sol B in an amount corresponding to 90 to 10 wt% of the total silica in the catalyst, with silica sols A and B having different average particle sizes, provided that the relations 3da100 and 0.1da/db0.9 are satisfied wherein da (mmmaSbbXcQdReOf(SiO2)g wherein Me represents at least one element selected from the group consisting of Fe, Co, Ni, Sn, U, Cr, Cu, Mn, Ti, Th, and Ce; X represents at least one element selected from the group consisting of V, Mo, and W; Q represents at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Y, La, Th, Zr, Hf, Nb, Ta, Re, Ru, Os, Rh, Ir, Pd, Pt, Ag, Zn, Cd, Al, Ga, In, Tl, Ge, Pb, As, and Se; R represents at least one element selected from the group consisting of B, P, Te, and Bi; and the subscripts a, b, c, d, e, and g represents atomic ratios and are respectively within the ranges a is from 5 to 15; b is from 5 to 100; c is from 0 to 15; d is from 0 to 20; e is from 0 to 10; g is from 10 to 200; and f refers to the number of oxygen atoms present in an oxide as formed by bonding the respective constituent elements.