Synthesis of Maleic Anhydride from Butane over Vanadium-Phosphorus Mixed Oxide Catalyst Having P/V Ratio of 2

Vanadium-phosphorus mixed oxide catalysts (V-P-O) having P/V ratio of 2 have been investigated for the synthesis of maleic anhydride (MA) from butane. The V-P70 catalyst consisted of amorphous phase and/or (VO) 2P4012 phase when the precursor VO (H2PO4)2 was calcined in the temperature range of 500-780℃. The V-P-O catalyst exhibited a good MA selectivity of 45-53 mol% in the butane oxidation at 470-500℃although butane conversion remained at a low level (