BISMUTH MOLYBDATE CATALYSTS - KINETICS AND MECHANISM OF PROPYLENE OXIDATION
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Oxidation of propylene to acrolein over bismuth molybdate catalysts was studied in a flow reactor at atmospheric pressure and at temperatures between 400 and 460 C. The kinetics were determined as first order in propylene and zero order in oxygen. Over this temperature range, the activation energy was 29 kcal per mole. The side products: acetaldehyde, formaldehyde, ethylene, carbon monoxide, and carbon dioxide, were formed almost exclusively in a consecutive pathway via acrolein or its surface species precursor when excess oxygen was present, A parallel pathway from propylene for the formation of carbon dioxide became important when there was an oxygen deficiency. A gas-phase, homogeneous oxidation of acrolein also became important when the postcatalytic volume of the reactor was increased. 1971, American Chemical Society. All rights reserved.