Oxidation catalysts of orthoxylene and naphthalene and the preparation thereof

Claim 1

A CATALYST FOR USE IN PREPARING PHTHALIC ANHYDRIDE BY OXIDIZING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORTHOXYLENE, NAPHTHALENE AND A MIXTURE THEREOF, SAID CATALYST COMPRISING A CATALYTIC COMPONENT ADHERED TO AN ANATASE-TYPE TITANIUM OXIDE CARRIER AND CONTAINING VANADIUM AND POTASSIUM IN A MOLAR RATIO OF 1:0.25-0.75, SAID CATALYST BEING PREPARED BY MIXING IN A LIQUID MEDIUM A VANADIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF VANADIUM PENTOXIDE AN AMMONIUM METAVANADATE AND A POTASSIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE, POTASSIUM CHLORIDE, POTASSIUM CARBONATE, POTASSIUM NITRATE, POTASSIUM ACETATE AND POTASSIUM FORMATE, WHEREBY THE MOLAR RATIO OF VANADIUM TO POTASSIUM BECOMES 1:0.25-0.75, ADHERING THIS MIXTURE TO AN ANATASE-TYPE TITANIUM OXIDE CARRIER AND DRYING THE SAME AT A TEMPERATURE ABOVE 40*C., THEREAFTER HEATING THE SAME TO A TEMPERATURE RANGING BETWEEN 200* AND 500*C. UNDER SULFURIC ACID ACIDIC CONDITIONS.