| 摘要 |
PURPOSE:To advantageously obtain methacrylic acid in high selectivity even at low temperatures by using a catalyst containing heteropoly-acids, having phosphorus, etc., as the central element and containing molybdenum and copper as a constituent element in catalytically oxidizing isobutane in the vapor phase and producing the subject compound. CONSTITUTION:A mixed gas containing isobutane and molecular oxygen in the vapor phase is brought into contact with a catalyst to produce methacrylic acid and/or methacrolein. In the process, a catalyst containing a heteropoly-acid and/or salt thereof, having P and/or As as the central atom and containing Mo and Cu as a catalyst constituent element is used as the above-mentioned catalyst to afford the methacrylic acid in good selectivity even at low reaction temperatures in one stage without requiring a special apparatus. The amounts of the elements are 0.5-3g atoms central atom and 0.01-3g atoms Cu based on 12g atoms Mo. Furthermore, since the low reaction temperatures suppress decomposition of the catalyst, the afore-mentioned method is economically advantageous to industrial practice. |
