Highly efficient iron-based MOFs mediated catalysts for Fischer- Tropsch synthesis: effect of reduction atmosphere Mehar U Nisa, Yao Chen, Xin Li, Xiangning Jiang, Zhenhua Li Tianjin University, China Introduction : Fischer-Tropsch synthesis (FTS) is a key process for the production of synthetic fuels and chemicals from syngas. The use of metal-organic frameworks (MOFs) as precursors for the preparation of Fe- based FTS catalysts has gained significant attention due to their high metal loadings and tunable properties. However, the effect of reduction atmosphere on the catalytic properties of these MOF-derived catalysts has not been thoroughly investigated. Methods: We prepared a series of Fe-based catalysts using different MOFs as precursors and evaluated their catalytic performance for FTS. The catalysts were reduced in different atmospheres (H2, CO, or a mixture of H2/ CO) to investigate the impact of reduction atmosphere on their properties and performance. Results : Our results showed that the reduction atmosphere had a significant impact on the morphology and size of the Fe nanoparticles, as well as their catalytic activity and selectivity. Specifically, the H2-reduced catalyst exhibited the highest activity and selectivity towards C5+ products, while the CO-reduced catalyst showed lower activity and higher selectivity towards CH4. The H2/CO-reduced catalyst showed intermediate performance. Discussion: Our findings suggest that the reduction atmosphere plays a crucial role in determining the catalytic properties of MOF-derived Fe-based catalysts for FTS. The H2-reduced catalyst showed the highest activity and selectivity, likely due to the small and uniform size of the Fe nanoparticles and the high degree of reduction. In contrast, the CO-reduced catalyst showed lower activity and higher selectivity towards CH4, likely due to the larger and less uniform size of the Fe nanoparticles and the incomplete reduction. The H2/CO-reduced catalyst showed intermediate performance, suggesting a trade-off between activity and selectivity. Implications: Our results highlight the importance of controlling the reduction atmosphere in the preparation of MOF-derived Fe-based catalysts for FTS. By optimizing the reduction conditions, it may be possible to further enhance the activity and selectivity of these catalysts, and to develop highly efficient and selective catalysts for the production of synthetic fuels and chemicals. Conclusion: Our study provides valuable insights into the effect of reduction atmosphere on the catalytic properties of MOF-derived Fe-based catalysts for FTS. The results suggest that the H2-reduced catalyst showed the highest activity and selectivity towards C5+ products, while the CO-reduced catalyst showed lower activity and higher selectivity towards CH4. The H2/CO-reduced catalyst showed intermediate performance, suggesting a trade-off between activity and selectivity. These findings have important implications for the development of efficient and selective FTS catalysts. References 1. Yao, C et al. Highly efficient iron-based MOFs mediated catalysts for Fischer–Tropsch synthesis: Effect of reduction atmosphere. Chem. Eng. J. 428, 131288 (2022). 2. Liu, X et al. (2019). Metal-organic frameworks derived Fe-N-C electrocatalysts for oxygen reduction reaction. Nano Energy, 55, 135-142. 3. Wang, Z. et al. (2020). Synthesis of iron-based MOF-derived hierarchical nanoporous Fe/Fe3C@ N-doped carbon for efficient oxygen reduction reaction. App. Surface Science, 502, 144062. 4. Ye, Y. et al. (2021). Surface modulation of metal-organic frameworks-derived catalysts for efficient electrochemical water splitting. Journal of Power Sources, 484, 229297. 5. Wang, Y. et al. (2019). Recent advances in metal-organic frameworks-derived materials for electrocatalysis. Nano Energy, 55, 495-521.
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