Abstract
The vapor phase air oxidation of 2-methylpropene to methacrolein over a bismuth-molybdate catalyst was investigated in an isothermal integral flow reactor at atmospheric pressure between 300 and 560 °C. The effects of several variables, feed ratio of oxygen to 2-methylpropene, reaction temperature and the reciprocal of space velocity on the conversion and product distribution were determined by gas chromatography. Though 13 different mechanisms were postulated, the rate of reaction was most satisfactorily correlated by a mechanism which assumes the rate-controlling step to be the surface reaction between charged absorbed 2-methylpropene and oxygen. The rate expression r = (K SK HP H) (1 + K HP H + K MP M) · (K OP O) (1 + K OP O) fitted the data best.
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