Abstract
The selective oxidation of olefins to unsaturated aldehydes over Bi molybdate catalysts is one of the most important reactions in petrochemical processes. The lattice oxygen of Bi molybdate is believed to be involved in the reaction, and lattice oxygen transfer is the rate-determining step at temperatures below 350 °C. Co and Fe are commonly added to Bi molybdate catalysts to accelerate the reoxidation of the active sites by the lattice oxygen transfer associated with the redox reaction of Fe. Hence, the reaction rate expression should include lattice oxygen transfer, which has not been previously reported. In this study, Bi molybdate catalysts loaded on an Fe-containing-Co molybdate support were synthesized, and the selective oxidation of allylbenzene to cinnamaldehyde was performed. The experimental reaction rates were satisfactorily described by the quasi-steady-state approximation of the lattice oxygen of the support surface. The high oxygen uptake ability of the support was found to be important for improving the catalyst activity.
Published Version
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