Carbon Pathways, Sodium‐Sulphur Promotion and Identification of Iron Carbides in Iron‐based Fischer‐Tropsch Synthesis. Issue 17 (9th June 2020)

• Record Type: Journal Article
• Authors: Paalanen, Pasi P.; Weckhuysen, Bert M.
• Is Part Of: ChemCatChem. Volume 12:Issue 17(2020)
• Page Start: 4202
• Page End: 4223
• Publication Date: 2020-06-09
• Subjects: Fischer-Tropsch Synthesis -- Process Conditions -- Na−S Promotion -- Iron Carbides -- Mössbauer Absorption Spectroscopy; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202000535
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Fisher‐Tropsch Synthesis (FTS) is industrially used for converting a carbon‐containing feedstock, such as coal, natural gas, biomass, and municipal waste, via the production of synthesis gas (a mixture of CO+H2 ) into hydrocarbons. This review article focuses on Fe‐based FTS catalysis, thereby focusing on the process conditions available for steering the various carbon pathways from input CO and their associated reactions. We will also discuss the effects of alkali‐sulphur chemical promotion and the identification of the FTS reaction active Fe carbides, which are assigned with precise crystal structures and nomenclature. Each observed Fe carbide crystal structure is further assigned with corresponding Mössbauer Absorption Spectroscopy (MAS) hyperfine fields. The expected formation temperatures and experimental conditions for the identified Fe carbides encountered in FTS research, namely ϵ‐Fe3 C, η‐Fe2 C, χ‐Fe5 C2, θ‐Fe3 C and θ‐Fe7 C3, are reviewed. Abstract : Fischer‐Tropsch Synthesis (FTS) is industrially used to convert a CO+H2 gas mixture into hydrocarbons. Reaction pathways for C from input CO are reviewed for Fe‐based FTS catalysts. Reaction conditions and Na−S promotion are discussed as means to alter these pathways. Crystal structures and their corresponding Mössbauer hyperfine field parameters are assigned for Fe carbides, the active phases for Fe‐based FTS catalysis.