▎ 摘　　要

NOVELTY - N-butane oxidation catalyst comprises a composite oxide of vanadium and phosphorus. The bulk P/V molar ratio of the catalyst is 0.98-1.10:1, preferably 1.00-1.10:1. The surface P/V molar ratio is 1.05-1.30:1, preferably 1.05-1.15:1. The surface P/V molar ratio of the catalyst is greater than the bulk P/V molar ratio. USE - The catalyst is useful in reaction of n-butane oxidation to maleic anhydride (claimed). ADVANTAGE - The catalyst has high catalytic activity and stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing the n-butane oxidation catalyst, comprising mixing vanadium, phosphorus, and oxygen (VPO) precursor with P-modified graphene and a pore-forming agent, subjecting to constant temperature and humidity treatment, molding, and activating.