PRODUCTION OF FLUID CATALYST CONSISTING OF OXIDE CONTAINING VANADIUM AND PHOSPHORUS

摘要

PURPOSE:To produce a fluid catalyst whose mechanical strength and fluidity of particles are excellent and which is used for production of maleic anhydride without necessitating a pulverizing process. CONSTITUTION:The particles of crystalline multiple oxide containing tetravalent vanadium and pentavalent phosphorus are obtained by making a pentavalent phosphorus compound react with a pentavalent vanadium compound in an organic solvent. The particles of crystalline multiple oxide are mixed with an aqueous solution containing tetravalent vanadium and phosphorus to form slurry. The slurry is agitated at 0-50 deg.C for 30-200 hours and burned after performing spray drying therefor. Thereby tetravalent vanadium and pentavalent phosphorus become amorphous vanadium-phosphorus oxide in a catalyst obtained by the following drying and burning and function as a binder component for revealing strength of the catalyst. The particles are effectively made small particles in an agitating process. Mechanical strength and fluidity of the particles are excellent in the reaction condition of a fluidized bed and reaction performance is made good for a long period.