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An Na-modified Fe@C core-shell catalyst for the enhanced production of gasoline-range hydrocarbons via Fischer-Tropsch synthesis.

ABSTRACT: Although numerous studies have been conducted in the field of converting syngas to value-added fuels, selectively converting syngas to gasoline-range hydrocarbons (C_5-12 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 C_5-12 hydrocarbons with a higher CO conversion of about 95% was obtained for the FeNa_2.0@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 C_5-12 hydrocarbon selectivity.

SUBMITTER: Ma G

PROVIDER: S-EPMC9050398 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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An Na-modified Fe@C core-shell catalyst for the enhanced production of gasoline-range hydrocarbons via Fischer-Tropsch synthesis.

Ma Guangyuan G Xu Yanfei Y Wang Jie J Bai Jingyang J Du Yixiong Y Zhang Jianli J Ding Mingyue M

RSC advances 20200318 18

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 ...[more]

PMID: 35492905

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Project description:The production of linear alpha-olefins (α-olefins) is a practical way to increase the economic potential of the Fischer-Tropsch synthesis (FTS) because of their importance as chemical intermediates. Our study aimed to optimize Na-promoted Fe1Zn1.2O x catalysts such that they selectively converted syngas to linear α-olefins via FTS at 340 °C and 2.0 MPa. The Fe1Zn1.2O x catalysts were calcined at different temperatures from 350 to 700 °C before Na anchoring. The increase in the size of the ZnFe2O4 crystals comprising the catalyst had a negative effect on the reducibility of Fe oxides and the particle size of Fe5C2 during the reaction. The Na species in the catalyst restrained the reduction of Fe1Zn1.2O x but facilitated the formation of Fe5C2. When pure Fe1Zn1.2O x was calcined at 400 °C, the corresponding catalyst (i.e., Na0.2/Fe1Zn1.2O x (400)) exhibited higher catalytic activity and stability than the other catalysts for a 50 h reaction. Compared to the other catalysts, Na0.2/Fe1Zn1.2O x (400) enabled a higher number of active Fe carbides (Fe5C2) to intimately interact with the Na species, even though the catalyst had a lower total surface basicity based on surface area. The Na0.2/Fe1Zn1.2O x (400) showed a maximum hydrocarbon yield of 49.7% with a maximum olefin selectivity of 61.3% in the C1-C32 range. Examination of the reaction product mixture revealed that the Na0.2/Fe1Zn1.2O x catalysts converted α-olefins to branched paraffins (13.9-19.5%) via a series of isomerization, skeletal isomerization, and hydrogenation reactions. The Na0.2/Fe1Zn1.2O x (400) catalyst had a relatively low consumption rate of internal olefins compared to other catalysts, resulting in the lowest selectivity for branched paraffins. The Na0.2/Fe1Zn1.2O x (400) showed a maximum α-olefin yield (26.6%) in the range C2-C32, which was 27.9-50.0% higher than that of other catalysts. The α-olefin selectivity in the C5-C12 range for the Na0.2/Fe1Zn1.2O x (400) was 37.5% relative to the total α-olefins.

Dataset Information

An Na-modified Fe@C core-shell catalyst for the enhanced production of gasoline-range hydrocarbons via Fischer-Tropsch synthesis.

Publications

An Na-modified Fe@C core-shell catalyst for the enhanced production of gasoline-range hydrocarbons <i>via</i> Fischer-Tropsch synthesis.

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