Abstract
It is well known that multicomponent bismuth molybdates are most active and selective catalysts for the allylic oxidation and ammoxidation of lower olefins.(1) They are widely used in industrial processes, but, owing to their complicated compositions and structures, little has been reported for the working mechanism and role of each element in the multicomponent catalyst system. In contrast, catalytic oxidations of lower olefins over simple bismuth molybdates have been extensively investigated. The reaction mechanism via allylic intermediates and participation of the lattice oxide ion intQ the surface reaction according to the Mars and van Klevelen mechanism(2) have been well established. Extension of the 18O2 tracer technique developed by Keulks(3) and Wragg et al.(4) made it possible to measure the diffusion rate of oxide ions in the typical phases of bismuth molyb-date and to determine the depth of the oxide ion layers which can be involved in the oxidation reaction.(5)
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