Catalytic Behavior and In Situ X-Ray Diffraction of Promoted Iron Catalysts for Fischer-Tropsch Synthesis

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Wen, Ruoxi ; Thiessen, Johannes ; Jess, Andreas:
Catalytic Behavior and In Situ X-Ray Diffraction of Promoted Iron Catalysts for Fischer-Tropsch Synthesis.
In: Chemie Ingenieur Technik. Bd. 94 (2022) Heft 11 . - S. 1756-1764.
ISSN 1522-2640
DOI: https://doi.org/10.1002/cite.202200056

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Abstract

The effects of structural promoters (ZnO, SiO2, and Al2O3) on the phase transformation during reduction and Fischer-Tropsch synthesis (FTS) of a FeCuK catalyst were investigated by in situ X-ray diffraction and the FTS catalytic performance was studied in a fixed-bed reactor. The reduction follows the path of Fe2O3/K2Fe22O34 → Fe3O4 → α-Fe. The addition of ZnO, SiO2, and Al2O3 delayed and prolonged the reduction. The iron carbides formed under reaction conditions were χ-Fe5C2 and ε-Fe2C. The presence of ZnO, SiO2, and Al2O3 favored the formation of χ-Fe5C2. ε-Fe2C is a more active phase. Besides, ε-Fe2C seems to favor the formation of CO2 and C5+ and χ-Fe5C2 benefits CH4 and C2–C4 products.