Efficient Oxidative Dehydrogenation of Ethylbenzene over K/CeO2 with Exceptional Styrene Yield

Oxidative dehydrogenation (ODH) is an alternative for styrene (ST) production compared to the direct process. However, ODH with O2 or CO2 suffers from either over-oxidation endothermic property/low ethylbenzene conversion. Herein, we proposed process a CO2-O2 mixture atmosphere efficient conversion of (EB) into styrene. A thermoneutral possible by rationalizing CO2/O2 molar ratios 0.65 0.66 in temperature range 300 650 °C. K modification favorable dehydrogenation, and 10%K/CeO2 achieved highest activity due enhanced oxygen mobility adsorbability. The catalyst 90.8% 97.5% selectivity under optimized conditions CO2-4O2 oxidation atmosphere, 500 °C, space velocity 5.0 h−1. It exhibited excellent catalytic structural stability during 50 h long-term test. induces vacancies ceria promotes exchange between gaseous ceria. follows Mars-van Krevelen (MvK) reaction mechanism via Ce3+/Ce4+ redox pairs. strategy using enriched catalysts offers important insight at mild conditions.