(43b) Demonstrating the Catalyst Reoxidation Mechanism: Alkene Dehydrogenation and Oxidation over VOx/CeO2
AIChE Annual Meeting
2022 Annual Meeting
Catalysis and Reaction Engineering Division
Fundamentals of Catalysis and Surface Science I: Hydrocarbon conversion chemistry
Monday, November 14, 2022 - 8:20am to 8:40am
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.