Sr2Fe1.575Mo0.5O6- δ Promotes the Conversion of Methane to Ethylene and Ethane

Shiqi Song; Lingting Ye; Kui Xie

doi:10.3390/membranes12090822

Sr₂Fe_1.575Mo_0.5O_{6- δ} Promotes the Conversion of Methane to Ethylene and Ethane

Membranes (Basel). 2022 Aug 23;12(9):822. doi: 10.3390/membranes12090822.

Authors

Shiqi Song^{1

2}, Lingting Ye^{1

3

4

5}, Kui Xie^{1

2

3

4

5}

Affiliations

¹ Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
² University of Chinese Academy of Sciences, Beijing 100049, China.
³ Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
⁴ Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou 350108, China.
⁵ Advanced Energy Science and Technology Guangdong Laboratory, 29 Sanxin North Road, Huizhou 116023, China.

Abstract

Oxidative coupling of methane can produce various valuable products, such as ethane and ethylene, and solid oxide electrolysis cells (SOECs) can electrolyze CH₄ to produce C₂H₄ and C₂H₆. In this work, Sr₂Fe_1.575Mo_0.5O_6-δ electrode materials were prepared by impregnation and in situ precipitation, and Sr₂Fe_1.5Mo_0.5O_6-δ was taken as a reference to study the role of metal-oxide interfaces in the catalytic process. When the Fe/Sr₂Fe_1.575Mo_0.5O_6-δ interface is well constructed, the selectivity for C₂ can reach 78.18% at 850 °C with a potential of 1.2 V, and the conversion rate of CH₄ is 11.61%. These results further prove that a well-constructed metal-oxide interface significantly improves the catalytic activity and facilitates the reaction.

Keywords: ethane and ethylene; metal–oxide interface; oxidative coupling of methane; solid oxide electrolysis cell.

Grants and funding

This research was funded by the National Key Research and Development Program of China (2017YFA0700102), the Natural Science Foundation of China (91845202, 22002167 and 21901243) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB2000000).