Abstract
The catalytic oxidation of propylene was studied in flow reactors having different postcatalytic volumes. Several different metal oxide catalysts were studied, including bismuth molybdate and cuprous oxide. Additional evidence is presented for a surface-initiated, homogeneous reaction that can occur in the postcatalytic volume. The reaction initiator is apparently an allyl peroxide or allyl hydroperoxide species which is formed on the surface by a mechanism involving the reaction of an adsorbed allyl species with molecular oxygen. Moreover, the results suggest that this allyl peroxide or allyl hydroperoxide species may also undergo a decomposition on the surface to produce acrolein in addition to the initiation of the homogeneous reaction.
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