Fischer–Tropsch Synthesis: Effect of Potassium on Activity and Selectivity for Oxide and Carbide Fe Catalysts

The effect of potassium on oxides and carbides of iron for Fischer–Tropsch synthesis (FTS) was investigated by pretreating Fe 3 O 4 and K-promoted Fe catalysts with different gases (H 2 /H 2 O and CO). A freshly activated sample and catalysts that were recovered from the CSTR before, during and afte...

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Bibliographic Details
Published in:Catalysis letters 2013-11, Vol.143 (11), p.1123-1131
Main Authors: Gnanamani, Muthu Kumaran, Hamdeh, Hussein H., Shafer, Wilson D., Sparks, Dennis E., Davis, Burtron H.
Format: Article
Language:English
Subjects:
Activation
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Exact sciences and technology
Fischer-Tropsch process
General and physical chemistry
Industrial Chemistry/Chemical Engineering
Iron carbides
Iron oxides
Magnetite
Mossbauer spectroscopy
Organometallic Chemistry
Physical Chemistry
Potassium
Pretreatment
Selectivity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Water gas
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Summary:The effect of potassium on oxides and carbides of iron for Fischer–Tropsch synthesis (FTS) was investigated by pretreating Fe 3 O 4 and K-promoted Fe catalysts with different gases (H 2 /H 2 O and CO). A freshly activated sample and catalysts that were recovered from the CSTR before, during and after FT synthesis were characterized ex situ using Mössbauer spectroscopy. Iron carbide is found to be active for both FT and water gas shift (WGS) reactions. After H 2 /H 2 O activation, all three catalysts (Fe 3 O 4 , low α-Fe, and high α-Fe) exhibit a steady but low FT activity for a period of FT synthesis. However, both FT and WGS activity for Fe 3 O 4 and low α-Fe catalysts were greatly improved after CO activation. In contrast, the high potassium containing catalyst (high α-Fe) did not show any further improvement in activity after CO activation. The difference in FT and WGS activity observed after pretreatment conditions using these catalysts may be associated to the amount of potassium and conversely the iron carbide present in the catalysts. Graphical Abstract
ISSN:1011-372X
1572-879X
DOI:10.1007/s10562-013-1110-7