IMPROVED VPO CATALYST WITH LOW VANADIUM OXIDATION STATE FOR MALEIC ANHYDRIDE PRODUCTION

摘要

The average Vanadium valence that oxidation catalyst contains vanadium, phosphorus and oxygen, which has, is less than about 4.10, and the method for preparing this catalyst is provided. The catalyst has at least about 5 pounds of side crushing strength, and improves yield of maleic anhydride from the absolute pressure between normal butane about 1% and about 6%. The catalyst is to be averaged Vanadium valence with about 4. by exposing traditional active catalyst VPO10 and about 4.Dielectric constant between 40 carries out redox reaction under conditions of having the first product between about 5 and about 55 to organic solvent, restores the vanadium of valence state lower than 4.10.