Patent ID: 7494952

Claim:
A process for preparing catalyst for the oxidation of an olefin to an unsaturated aldehyde comprising: a) dissolving compounds of molybdenum, bismuth, iron, cesium, and optional compounds of tungsten, M and M′ in water or acid to form a reaction solution, wherein M is one or more selected from antimony, phosphorus, boron, sulfur, silicon, aluminum, titanium, tellurium, vanadium, zirconium and niobium and M′ is one or more selected from cobalt, nickel, magnesium, zinc, potassium, rubidium, thallium, manganese, barium, chromium, cerium, tin, lead, cadmium and copper; b) precipitating a solid in the reaction solution to form a reaction slurry; c) aging the slurry for about 5 to about 10 hours with little or no agitation; d) evaporating liquid from the slurry to form a solid catalyst precursor; e) calcining the solid to form oxides of the metals to form a catalyst of the general formula: Mo 12 Bi a W b Fe c Cs g M m M′ m′ O x wherein a is in the range from 0.1 to 1.5, b is 0 to 9, c is in the range from 0.2 to 5.0, g is in the range from 0.1 to 1.5, m is in the range from 0 to 9, m′ is from 0 to 9 and x is determined by the valences of the other components.