A process is described for producing a catalyst for gas-phase oxidations, in which a suspension of TiO.sub.2 and V.sub.2O.sub.5 particles is applied to a fluidized inert support, wherein at least 90% by volume of the V.sub.2O.sub.5 particles have a diameter of 20 .mu.m or less and at least 95% by volume of the V.sub.2O.sub.5 particles have a diameter of 30 .mu.m or less. The defined particle size distribution of the V.sub.2O.sub.5 allows a high coating efficiency.