(43b) Demonstrating the Catalyst Reoxidation Mechanism: Alkene Dehydrogenation and Oxidation over VOx/CeO2

The mechanistic complexity of selective oxidation reactions poses grand challenges in heterogeneous catalysis field, including selective methane oxidation, alkane oxidative dehydrogenation (ODH), alkene epoxidation, and so forth. In Mars-van Krevelen mechanism, re-oxidation of catalysts steps are faster than reduction steps in most reactions, thus the former steps are considered to be kinetically invisible, and then poorly understood. In this study, we report and propose re-oxidation mechanism of Ceria supported vanadium catalyst at mild reaction temperature (150 ºC) with O₂/H₂O₂ as oxidants, and with cyclohexene as a reactant. This reaction system allows us to investigate previously neglected re-oxidation of catalysts mechanism.