Stabilized ε-Fe2C catalyst with Mn tuning to suppress C1 byproduct selectivity for high-temperature olefin synthesis

Fei Qian, Jiawei Bai, Yi Cai, Hui Yang, Xue-Min Cao, Xingchen Liu (), Xing-Wu Liu (), Yong Yang, Yong-Wang Li, Ding Ma and Xiao-Dong Wen ()
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Fei Qian: Chinese Academy of Sciences
Jiawei Bai: Chinese Academy of Sciences
Yi Cai: Chinese Academy of Sciences
Hui Yang: Chinese Academy of Sciences
Xue-Min Cao: Chinese Academy of Sciences
Xingchen Liu: Chinese Academy of Sciences
Xing-Wu Liu: Huairou District
Yong Yang: Chinese Academy of Sciences
Yong-Wang Li: Chinese Academy of Sciences
Ding Ma: Peking University
Xiao-Dong Wen: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Accurately controlling the product selectivity in syngas conversion, especially increasing the olefin selectivity while minimizing C1 byproducts, remains a significant challenge. Epsilon Fe2C is deemed a promising candidate catalyst due to its inherently low CO2 selectivity, but its use is hindered by its poor high-temperature stability. Herein, we report the successful synthesis of highly stable ε-Fe2C through a N-induced strategy utilizing pyrolysis of Prussian blue analogs (PBAs). This catalyst, with precisely controlled Mn promoter, not only achieved an olefin selectivity of up to 70.2% but also minimized the selectivity of C1 byproducts to 19.0%, including 11.9% CO2 and 7.1% CH4. The superior performance of our ε-Fe2C-xMn catalysts, particularly in minimizing CO2 formation, is largely attributed to the interface of dispersed MnO cluster and ε-Fe2C, which crucially limits CO to CO2 conversion. Here, we enhance the carbon efficiency and economic viability of the olefin production process while maintaining high catalytic activity.

Date: 2024
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DOI: 10.1038/s41467-024-49472-x

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