Revealing the Catalytic Role of Sn Dopant in CO2‐Oxidative Dehydrogenation of Propane over Pt/Sn‐CeO2 Catalyst. Issue 23 (7th November 2022)

• Record Type: Journal Article
• Authors: Wang, Yehong; Wang, Jiapei; Zhang, Yuda; Guo, Qiang; An, Jie; Liang, Yafei; Wang, Yanan; Cao, Pengfei; Heggen, Marc; Dunin‐Borkowski, Rafal E.; Zhu, Xiangxue; Li, Xiujie; Wang, Feng
• Is Part Of: ChemCatChem. Volume 14:Issue 23(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-07
• Subjects: CeO2-based catalysts -- CO2 conversion -- dehydrogenation of propane -- Sn doping; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202200982
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: CO2 ‐oxidative dehydrogenation of propane (CO2 ‐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 CO2 simultaneously. Herein, a Sn doped CeO2 supported Pt (Pt/Sn‐CeO2 ) catalyst in CO2 ‐ODHP reaction is reported. Sn doping appears to kill two birds with one stone for propane and CO2 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 CeO2 support, facilitating CO2 dissociation. A higher propylene selectivity (63.9 % vs 22.3 %) was obtained on 0.1 wt % Pt/1.0 wt % Sn‐CeO2 than that on 0.1 wt % Pt/CeO2 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. Abstract : A Pt/Sn‐CeO2 catalyst shows a higher catalytic activity in CO2 ‐oxidative dehydrogenation of propane than a Pt/CeO2 catalyst. It derives from the crucial role of Sn dopant. The Sn doping not only increases the electron density of Pt species via PtSn alloy formation but also enhances oxygen vacancy concentrations of CeO2 support, leading to the enhancement of propane adsorption and CO2 dissociation.