Volume 14, Issue 23 e202200982
Research Article

Revealing the Catalytic Role of Sn Dopant in CO2-Oxidative Dehydrogenation of Propane over Pt/Sn-CeO2 Catalyst

Yehong Wang

Corresponding Author

Yehong Wang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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Jiapei Wang

Jiapei Wang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Yuda Zhang

Yuda Zhang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Dr. Qiang Guo

Dr. Qiang Guo

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Jie An

Jie An

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Yafei Liang

Yafei Liang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Yanan Wang

Yanan Wang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Dr. Pengfei Cao

Dr. Pengfei Cao

Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Juelich GmbH, Juelich, 52425 Germany

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Prof. Marc Heggen

Prof. Marc Heggen

Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Juelich GmbH, Juelich, 52425 Germany

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Prof. Rafal E. Dunin-Borkowski

Prof. Rafal E. Dunin-Borkowski

Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Juelich GmbH, Juelich, 52425 Germany

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Prof. Xiangxue Zhu

Prof. Xiangxue Zhu

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Prof. Xiujie Li

Corresponding Author

Prof. Xiujie Li

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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Prof. Feng Wang

Prof. Feng Wang

Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023 P. R. China

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First published: 11 September 2022

Graphical 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.

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.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.