As CO2 has taken a central stage in energy & environmental domains, the effective utilization of CO2 as a soft oxidant for the catalytic dehydrogenation of hydrocarbons especially ethylbenzene (EB) has attracted much attention in recent years. Generally, vanadia-supported oxide catalysts show higher activity for the titled reaction, and the reaction may follow the Mars-van Krevelen redox mechanism involving the lattice oxygen over the catalyst. Moreover, being a catalyst or catalyst support with excellent redox properties, ceria or ceria-zirconia is found to be active for the titled reaction. However, the reported catalysts showed severe deactivation. In our previous works, impregnation of V2O5 on CexZr1-xO2-Al2O3 was found to be an active and stable catalyst for the dehydrogenation of ethylbenzene with CO2 (CO2-EBDH). In this work, the catalyst was further optimized in the aspects of Ce/Zr molar ratio, vanadia loading, and preparation methods. Moreover, effects of reaction temperature and CO2/EB ratio on the activity and stability were quantitatively studied. The deactivation and regeneration behavior of the catalyst was probed, and the optimized catalyst was run for over 100 h without deactivation. Combining the reaction and catalyst characterization results, a reasonable mechanism is proposed.

CO<sub>2</sub> as a soft oxidant for the dehydrogenation of ethylbenzene over vanadia-based catalyst

243rd National Meeting (2012)

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CO2 as a soft oxidant for the dehydrogenation of ethylbenzene over vanadia-based catalyst

CO₂ as a soft oxidant for the dehydrogenation of ethylbenzene over vanadia-based catalyst