| abstract |
An object of the present invention is to suppress the deterioration of the performance of a molybdenum composite oxide catalyst when performing gas phase contact partial oxidation with molecular oxygen using a tubular reactor. In the present invention, a mixed gas (air volume 75% by volume and water vapor 25) is used at a 440 ° C. using a tubular reactor in which a Mo compound layer containing a Mo compound and a complex oxide catalyst layer containing a Mo composite oxide catalyst are arranged in order from the reaction raw material supply port side. The volumetric volatilization) relates to a catalytic oxidation method in which the Mo volatilization amount of the Mo compound is larger than the Mo volatility amount of the Mo composite oxide catalyst. |