Revealing the Catalytic Role of Sn Dopant in CO<sub>2</sub>‐Oxidative Dehydrogenation of Propane over Pt/Sn‐CeO<sub>2</sub> Catalyst
Yehong Wang, Jiapei Wang, Yuda Zhang, Qiang Guo, Jie An, Yafei Liang, Yanan Wang, Pengfei Cao, Marc Heggen, Rafal E. Dunin‐Borkowski, Xiangxue Zhu, Xiujie Li, Feng Wang, Xiujie Li, Feng Wang
Abstract
Abstract CO 2 ‐oxidative dehydrogenation of propane (CO 2 ‐ODHP) provides a promising route for propylene production. Sufficient propane conversion and propylene selectivity remain a great challenge due to the difficulty in activating inert propane and CO 2 simultaneously. Herein, a Sn doped CeO 2 supported Pt (Pt/Sn‐CeO 2 ) catalyst in CO 2 ‐ODHP reaction is reported. Sn doping appears to kill two birds with one stone for propane and CO 2 activation. On the one side, it increases the electron density of Pt species via PtSn alloy formation, promoting propane adsorption and C−H bond cleavage. On the other side, it enhances oxygen vacancy concentrations of CeO 2 support, facilitating CO 2 dissociation. A higher propylene selectivity (63.9 % vs 22.3 %) was obtained on 0.1 wt % Pt/1.0 wt % Sn‐CeO 2 than that on 0.1 wt % Pt/CeO 2 with a comparable propane conversion (15.1 % vs 14.3 %) at 550 °C after 240 min on stream. This work provides a reference for designing efficient catalysts.