Abstract
Understanding the relationship between iron carbide phases and their catalytic performance for iron-based Fischer–Tropsch synthesis (FTS) catalysts is crucial to design of excellent FTS catalysts. In order to eliminate the influence of other factors such as promoters, diffusion limitation and metal-inert support interaction, the iron-based catalysts with unpromoted and unsupported structure were developed to investigate the role of iron carbides in the activity and selectivity. Herein, the ratio of iron carbide species was successfully regulated under the same carburization conditions by precisely controlling the degrees of oxidation for iron metal microsphere, and the superior catalytic performance for conversion of CO to alkenes is realized at the optimal ratio of θ-Fe3C/χ-Fe5C2 = 1.5. Combining various characterization techniques, it is found that the synergistic effects of θ-Fe3C and χ-Fe5C2 plays a crucial role in the formation of alkenes. This finding not only provides a newly way to understand the role of iron carbides, but also opens an avenue for designing effective catalysts to the yield of alkenes (especially C5+ alkenes).
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Acknowledgements
This work was supported by National Natural Science Foundation of People’s Republic of China (Grant Nos. U20B2022, 91334206). This work was also supported by CNOOC and Synfuels China Technology Co., Ltd.
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Lu, F., Chen, X., Wen, L. et al. The Synergic Effects of Iron Carbides on Conversion of Syngas to Alkenes. Catal Lett 151, 2132–2143 (2021). https://doi.org/10.1007/s10562-020-03505-4
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DOI: https://doi.org/10.1007/s10562-020-03505-4