Patent ID: 7501377

Claim:
A process for preparing catalyst for the oxidation of an olefin to an unsaturated aldehyde comprising: a) dissolving molybdenum, bismuth, iron and cesium metal compounds and, optionally, a tungsten compound and a compound of M, wherein M is one or more metal selected from the group consisting of calcium, strontium, lithium, sodium, selenium, cobalt, nickel, magnesium, zinc, potassium, rubidium, thallium, manganese, barium, chromium, tin, lead, cadmium, and copper, in water or acid to form a mixture; b) precipitating a solid catalyst precursor from said mixture to form a slurry; c) separating the solid from liquid of the slurry; d) drying the solid; and e) calcining the solid to form a mixed metal oxide having the formula: Mo 12 Bi a W b Fe c Cs g M m O x wherein a is in the range from 0.1 to 1.5, b is in the range from 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, x is determined by the valences of the other components and wherein the relative amount ratio of c to g is from 3.3 to 5.0, the relative amount ratio of c to a is from 2.0 to 6.0 and the relative amount ratio of (3a+3c+g+Σv n m n )/(2×12+2b) is from 0.95 to 1.10 with v being valence of each M, and n being the total number of M.