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Facet sensitivity of iron carbides in Fischer-Tropsch synthesis

Wenlong Wu, Jiahua Luo, Jiankang Zhao, Menglin Wang, Lei Luo, Sunpei Hu, Bingxuan He, Chao Ma, Hongliang Li () and Jie Zeng ()
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Wenlong Wu: Anhui University of Technology
Jiahua Luo: University of Science and Technology of China
Jiankang Zhao: University of Science and Technology of China
Menglin Wang: University of Science and Technology of China
Lei Luo: University of Science and Technology of China
Sunpei Hu: University of Science and Technology of China
Bingxuan He: University of Science and Technology of China
Chao Ma: Hunan University
Hongliang Li: University of Science and Technology of China
Jie Zeng: Anhui University of Technology

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

Abstract: Abstract Fischer-Tropsch synthesis (FTS) is a structure-sensitive reaction of which performance is strongly related to the active phase, particle size, and exposed facets. Compared with the full-pledged investigation on the active phase and particle size, the facet effect has been limited to theoretical studies or single-crystal surfaces, lacking experimental reports of practical catalysts, especially for Fe-based catalysts. Herein, we demonstrate the facet sensitivity of iron carbides in FTS. As the prerequisite, {202} and {112} facets of χ-Fe5C2 are fabricated as the outer shell through the conformal reconstruction of Fe3O4 nanocubes and octahedra, as the inner cores, respectively. During FTS, the activity and stability are highly sensitive to the exposed facet of iron carbides, whereas the facet sensitivity is not prominent for the chain growth. According to mechanistic studies, {202} χ-Fe5C2 surfaces follow hydrogen-assisted CO dissociation which lowers the activation energy compared with the direct CO dissociation over {112} surfaces, affording the high FTS activity.

Date: 2024
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DOI: 10.1038/s41467-024-50544-1

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