Patent ID: 6514902
Filing Date: 2003-02-04
Classification: B01J,C07C,Y02P

Abstract:
A process for producing an oxide catalyst for use in producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation in the gaseous phase, said oxide catalyst comprising a compound oxide represented by the following formula:Mo1.0VaSbbXcOnâ€ƒâ€ƒ(I) wherein:X represents at least one element selected from the group consisting of niobium, tungsten, chromium, titanium, tantalum, zirconium, hafnium, manganese, rhenium, iron, ruthenium, cobalt, rhodium; nickel, palladium, platinum, copper, silver, zinc, boron, gallium, indium, germanium, tin, tellurium, phosphorus, lead, bismuth, rare earth elements, and alkaline earth metals; and a, b, c and n are, respectively, the atomic ratios of vanadium (V), antimony (Sb), X and oxygen (O), relative to molybdenum (Mo), â€ƒwherein 0.1&lE;a&lE;1.0, 0.01&lE;b&lE;0.6, 0&lE;c&lE;1.0, and n is a number determined by and consistent with the valence requirements of the other elements present in the compound oxide of formula (I), which comprises the following steps (1) to (5):(1) providing a solution or slurry of a raw material mixture in at least one liquid medium selected from the group consisting of water and an alcohol, said raw material mixture comprising a molybdenum (Mo) compound, a vanadium (V) compound, an antimony (Sb) compound and optionally at least one X compound selected from the group consisting of compounds of elements defined as X in formula (I), (2) subjecting said raw material mixture solution or slurry to at least one oxidation treatment selected from the group consisting of: (2-a) a heat treatment at 50 to 300Â° C. in the presence of an oxidizing gas for 1 hour or more, and (2-b) a treatment with an oxidizing liquid, thereby obtaining an oxidized raw material mixture solution or slurry, (3) optionally adding to said oxidized raw material mixture solution or slurry obtained in step (2) at least one X compound selected from the group consisting of compounds of elements defined as X in formula (I), (4) drying said oxidized raw material mixture solution or slurry obtained in step (2) or said oxidized raw material mixture solution or slurry having added thereto said X compound obtained in step (3), to thereby obtain a dried catalyst precursor, and (5) calcining'said dried catalyst precursor to thereby obtain an oxide catalyst comprising a compound oxide of formula (I).