Journal
RSC ADVANCES
Volume 10, Issue 18, Pages 10723-10730Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra01036g
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Funding
- National Natural Science Foundation of China [51861145102, 21978225]
- Science and Technology Program of Shenzhen [JCYJ20180302153928437]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2019-KF-06]
- Fundamental Research Fund for the Central Universities [2042019kf0221]
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Although numerous studies have been conducted in the field of converting syngas to value-added fuels, selectively converting syngas to gasoline-range hydrocarbons (C5-12 hydrocarbons) remains a big challenge. Alkali metal (namely, K, Na and Li)-modified Fe@C core-shell catalysts were synthesized by a one-step hydrothermal method for Fischer-Tropsch synthesis. An optimized selectivity of 56% for the C5-12 hydrocarbons with a higher CO conversion of about 95% was obtained for the FeNa2.0@C catalyst compared to that for other alkali metal-modified Fe@C catalysts. According to the characterization results, the incorporation of alkali metals into Fe@C enhanced the conversion of FeCO3 to Fe3O4, which promoted the formation of the FTS active phase iron carbides. In particular, the strongest interaction of Fe-alkali metal and the highest amount of surface carbon layers were observed after adding an Na promoter into Fe@C in contrast to that observed for K and Li promoters, which strengthened the synergistic effect of Fe-Na metals and the spatial confinement of the core-shell structure, further improving the C5-12 hydrocarbon selectivity.
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