Abstract
The vapor phase catalytic air oxidation of methanol to formaldehyde over vanadium pentoxide-molybdenum trioxide was investigated between 250 and 530 °C at atmospheric pressure. By using gas chromatographic technique, accurate analysis of the products were obtained, and the effects of several process variables on the conversion of methanol and the selectivity of the catalyst for formaldehyde formation were determined. The maximum yield of formaldehyde (100% selectivity) and more than 99% conversion were achieved at 466 °C for a W F ratio of 31.7 g h/mole, containing 8% methanol in the feed. The rate expression, r = [ k 1p M 1 + ( k 1p M 2k 2 p O 2 0.5 )] , deduced assuming a steady state involving a two-stage irreversible oxidation-reduction process represented the data very satisfactorily.
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