Patent ID: 7229945

Claim:
A process for preparing catalyst for the oxidation of an olefin to an unsaturated aldehyde comprising: a) forming a slurry of water insoluble components of molybdenum, bismuth, iron, cesium, tungsten and M in water or acid, wherein M is one or more of antimony, phosphorus, boron, sulfur, silicon, aluminum, titanium, tellurium, vanadium, zirconium or niobium, and wherein the bismuth, iron and cesium components are nitrates; b) precipitating an intermediate catalyst precursor; c) removing liquid from the intermediate catalyst precursor; d) washing the intermediate catalyst precursor; e) drying the intermediate catalyst precursor; f) contacting the intermediate catalyst precursor with a solution of water soluble M′ components, wherein M′ is one or more of cobalt, nickel, magnesium, zinc, potassium, rubidium, thallium, manganese, barium, chromium, cerium, tin, lead, cadmium or copper, to form a final catalyst precursor; g) removing water from the final catalyst precursor; h) drying the final catalyst precursor; and i) calcining the final catalyst precursor to form oxides of the metals to form a catalyst.