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Communication

Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres

1
Department of Chemistry, Technische Universität Berlin, Strasse des 17. Juni 124, D-10623 Berlin, Germany
2
BasCat—UniCat BASF JointLab, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Simone Mascotto
Catalysts 2021, 11(7), 773; https://doi.org/10.3390/catal11070773
Received: 20 May 2021 / Revised: 23 June 2021 / Accepted: 24 June 2021 / Published: 25 June 2021
(This article belongs to the Special Issue Surface Design of Metal Oxide Catalysts)
CO2 Fischer–Tropsch synthesis (CO2–FTS) is a promising technology enabling conversion of CO2 into valuable chemical feedstocks via hydrogenation. Iron–based CO2–FTS catalysts are known for their high activities and selectivities towards the formation of higher hydrocarbons. Importantly, iron carbides are the presumed active phase strongly associated with the formation of higher hydrocarbons. Yet, many factors such as reaction temperature, atmosphere, and pressure can lead to complex transformations between different oxide and/or carbide phases, which, in turn, alter selectivity. Thus, understanding the mechanism and kinetics of carbide formation remains challenging. We propose model–type iron oxide films of controlled nanostructure and phase composition as model materials to study carbide formation in syngas atmospheres. In the present work, different iron oxide precursor films with controlled phase composition (hematite, ferrihydrite, maghemite, maghemite/magnetite) and ordered mesoporosity are synthesized using the evaporation–induced self–assembly (EISA) approach. The model materials are then exposed to a controlled atmosphere of CO/H2 at 300 °C. Physicochemical analysis of the treated materials indicates that all oxides convert into carbides with a core–shell structure. The structure appears to consist of crystalline carbide cores surrounded by a partially oxidized carbide shell of low crystallinity. Larger crystallites in the original iron oxide result in larger carbide cores. The presented simple route for the synthesis and analysis of soft–templated iron carbide films will enable the elucidation of the dynamics of the oxide to carbide transformation in future work. View Full-Text
Keywords: CO2 Fischer–Tropsch synthesis; iron oxide; iron carbides; mesoporous films; EISA CO2 Fischer–Tropsch synthesis; iron oxide; iron carbides; mesoporous films; EISA
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MDPI and ACS Style

Arinchtein, A.; Ye, M.-Y.; Geske, M.; Frisch, M.; Kraehnert, R. Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres. Catalysts 2021, 11, 773. https://doi.org/10.3390/catal11070773

AMA Style

Arinchtein A, Ye M-Y, Geske M, Frisch M, Kraehnert R. Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres. Catalysts. 2021; 11(7):773. https://doi.org/10.3390/catal11070773

Chicago/Turabian Style

Arinchtein, Aleks, Meng-Yang Ye, Michael Geske, Marvin Frisch, and Ralph Kraehnert. 2021. "Influence of Phase Composition and Pretreatment on the Conversion of Iron Oxides into Iron Carbides in Syngas Atmospheres" Catalysts 11, no. 7: 773. https://doi.org/10.3390/catal11070773

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