abstract |
The present invention relates to a process for the production of methacrylic acid and methacrolein by means of gas phase oxidation of isobutane in the gaseous phase at 250 DEG to 450 DEG C. on molybdenum heteropoly acid catalysts that are made up of CUaHbPcModVeOf heteropoly acid compounds (I), where a=0.1 to 1, b=0 to 7.8, c=0.8 to 1.2, d=9 to 12, e=0.5 to 3, and f depends on the molar numbers a to e, and/or the heteropoly acid H8PMo10VO39 (II) or its anhydride PMo10VO35 (III). |