A combined in situ XAS-XRPD-Raman study of Fischer–Tropsch synthesis over a carbon supported Co catalyst

Tsakoumis, Nikolaos E.; Dehghan, Roya; Johnsen, Rune E.; Voronov, Alexey; Beek, Wouter van; Walmsley, John C.; Borg, Øyvind; Rytter, Erling; Chen, De; Rønning, Magnus; Holmén, Anders

doi:10.1016/j.cattod.2012.08.041

Cited by 49 publications

(62 citation statements)

References 33 publications

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“…The bed length was 10 mm, and the catalyst bed was fixed using glass wool. The setup for the in situ measurements was described elsewhere [48]. The wavelength used for XRD was 0.4944 Å, and the data were converted to 1.78897 Å (Co Ka) using the software Winplotr.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Effect of support surface treatment on the synthesis, structure, and performance of Co/CNT Fischer–Tropsch catalysts

Eschemann

Lamme

Manchester

et al. 2015

Journal of Catalysis

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110

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Section: Catalyst Characterizationmentioning

confidence: 99%

Effect of support surface treatment on the synthesis, structure, and performance of Co/CNT Fischer–Tropsch catalysts

Eschemann

Lamme

Manchester

et al. 2015

Journal of Catalysis

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110

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“…[57][58][59][60] Around 5-6 mg of catalyst was placed inside aq uartz capillary reactor (1.0 mm outer diameter) and set with glass wool (bed length ca. [57][58][59][60] Around 5-6 mg of catalyst was placed inside aq uartz capillary reactor (1.0 mm outer diameter) and set with glass wool (bed length ca.…”

Section: Combined In Situ Xanes/xrd/ms Set-upmentioning

confidence: 99%

The Effect of Copper Loading on Iron Carbide Formation and Surface Species in Iron‐Based Fischer–Tropsch Synthesis Catalysts

et al. 2018

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The effect of copper as promoter on iron carbide formation and the nature of surface species on iron‐based catalyst during Fischer–Tropsch synthesis (FTS) was investigated. Iron‐based catalysts (15 wt % of Fe) supported on alumina promoted with copper (0, 0.6, 2, and 5 wt %) were characterised in situ at relevant FTS conditions. The catalysts promoted with 2 and 5 wt % of Cu showed higher catalytic activity due to the formation of Hägg carbide (Fe5C2) detected by in situ XANES and XRD. The carbide formation is attributed to a weakening of the iron–alumina mixed‐compound interactions, and hence increasing iron reducibility and dispersion. The in situ XANES measurements indicated a maximum carburization degree (ca. 20–22 %) even at high Cu loading. The catalyst promoted with 5 wt % of Cu exhibited higher water‐gas shift activity. Aliphatic hydrocarbons, formate, and carboxylate species were detected on the catalyst surface during FTS. After exposing the spent catalysts to hydrogenation conditions, the carboxylate species remained strongly adsorbed while aliphatic hydrocarbons and formate species disappeared. The accumulation of oxygenates species on the catalyst surface increased with Cu loading. The interaction of oxygenates with alumina and iron oxide particles (FexOy) were revealed, with the latter being a possible reason for inhibition of further iron carburization.

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“…In the GTL process, natural gas is first converted to syngas, which consists of carbon monoxide and hydrogen. Syngas can be converted directly to hydrocarbons through the Fischer-Tropsch synthesis (FTS) using metal-based catalysts [1][2][3][4][5][6]. Another means of hydrocarbon production from syngas is a two-stage process: (1) the conversion of syngas to methanol over metal-based catalysts; (2) the conversion of methanol to hydrocarbons through the Methanol-to-Hydrocarbons (MTH) reaction over solid acid catalysts [7,8].…”

Section: Introductionmentioning

confidence: 99%

Selective Synthesis of Gasoline-Ranged Hydrocarbons from Syngas over Hybrid Catalyst Consisting of Metal-Loaded ZSM-5 Coupled with Copper-Zinc Oxide

Imai

Yamawaki

et al. 2014

Catalysts

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Abstract:The conversion of syngas (CO + H 2 ) to gasoline-ranged hydrocarbons was carried out using a hybrid catalyst consisting of metal-loaded ZSM-5 coupled with Cu-ZnO in a near-critical n-hexane solvent. Methanol was synthesized from syngas over Cu-ZnO; subsequently, was converted to hydrocarbons through the formation of dimethyl ether (DME) over the metal-loaded ZSM-5. When 0.5 wt% Pd/ZSM-5 and 5 wt% Cu/ZSM-5 among the metal-loaded ZSM-5 catalysts with Pd, Co, Fe or Cu were employed as a portion of the hybrid catalyst, the gasoline-ranged hydrocarbons were selectively produced (the gasoline-ranged hydrocarbons in all hydrocarbons: 59% for the hybrid catalyst with Pd/ZSM-5 and 64% for that with Cu/ZSM-5) with a similar CO conversion during the reaction. An increase in the Cu loading on ZSM-5 resulted in increasing the yield of the gasoline-ranged hydrocarbons, and in decreasing the yield of DME. Furthermore, the hybrid catalyst with Cu/ZSM-5 exhibited no deactivation for 30 h of the reaction. It was revealed that a hybrid catalyst containing Cu/ZSM-5 was efficient in the selective synthesis of gasoline-ranged hydrocarbons from syngas via methanol in the near-critical n-hexane fluid.

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A combined in situ XAS-XRPD-Raman study of Fischer–Tropsch synthesis over a carbon supported Co catalyst

Cited by 49 publications

References 33 publications

Effect of support surface treatment on the synthesis, structure, and performance of Co/CNT Fischer–Tropsch catalysts

Effect of support surface treatment on the synthesis, structure, and performance of Co/CNT Fischer–Tropsch catalysts

The Effect of Copper Loading on Iron Carbide Formation and Surface Species in Iron‐Based Fischer–Tropsch Synthesis Catalysts

Selective Synthesis of Gasoline-Ranged Hydrocarbons from Syngas over Hybrid Catalyst Consisting of Metal-Loaded ZSM-5 Coupled with Copper-Zinc Oxide

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