Manganese as a structural promoter in silica-supported cobalt Fischer-Tropsch catalysts under simulated high conversion conditions

Journal article (2023)

Authors

L.M. van Koppen Eindhoven University of Technology, RST/Fundamental Aspects of Materials and Energy - AS
A.I. Dugulan RID/TS/Instrumenten groep , RST/Fundamental Aspects of Materials and Energy - AS
G. Leendert Bezemer Shell Global Solutions International B.V.
Emiel J.M. Hensen Eindhoven University of Technology
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
Copyright: © 2023 L.M. van Koppen, A.I. Dugulan, G. Leendert Bezemer, Emiel J.M. Hensen
DOI
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https://doi.org/10.1016/j.jcat.2023.115173
Manganese Deactivation Fischer-Tropsch synthesis Mössbauer spectroscopy Cobalt
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Published Date

2023

Language

English

Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

Understanding the deactivation mechanism of cobalt-based Fischer-Tropsch catalysts is of significant practical importance. Herein, we explored the role of manganese as a structural promoter on silica-supported cobalt nanoparticles under simulated high CO conversion conditions, i.e., high relative humidity. The structural changes in cobalt dispersion and oxidation state were followed by in situ Mössbauer emission spectroscopy. Adding manganese oxide to silica-supported cobalt enhanced the dispersion of metallic cobalt in the reduced catalysts. This higher cobalt dispersion, however, led to a stronger tendency of cobalt silicate formation under humid conditions. Without manganese, the cobalt particles sintered, and the larger ones were prone to transformation into cobalt carbide under high conversion conditions. As such, silica is not preferred as a support for practical FTS.