In Situ X-ray Raman Scattering Spectroscopy of the Formation of Cobalt Carbides in a Co/TiO2 Fischer-Tropsch Synthesis Catalyst

José G. Moya-Cancino, Ari Pekka Honkanen, Ad M.J. Van Der Eerden, Ramon Oord, Matteo Monai, Iris Ten Have, Christoph J. Sahle, Florian Meirer, Bert M. Weckhuysen, Frank M.F. De Groot*, Simo Huotari

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We present in situ experiments to study the possible formation of cobalt carbides during Fischer-Tropsch synthesis (FTS) in a Co/TiO2 catalyst at relevant conditions of pressure and temperature. The experiments were performed by a combination of X-ray Raman scattering (XRS) spectroscopy and X-ray diffraction (XRD). Two different experiments were performed: (1) a Fischer-Tropsch Synthesis (FTS) reaction of an ∼14 wt % Co/TiO2 catalyst at 523 K and 5 bar under H2 lean conditions (i.e., a H2:CO ratio of 0.5) and (2) carburization of pure cobalt (as reference experiment). In both experiments, the Co L3-edge XRS spectra reveal a change in the oxidation state of the cobalt nanoparticles, which we assign to the formation of cobalt carbide (Co2C). The C K edge XRS spectra were used to quantify the formation of different carbon species in both experiments.

Original languageEnglish
Pages (from-to)809-819
Number of pages11
JournalACS Catalysis
Volume11
Issue number2
DOIs
Publication statusPublished - 15 Jan 2021

Keywords

  • catalyst deactivation
  • cobalt carbide
  • Fischer-Tropsch synthesis
  • heterogeneous catalysis
  • X-ray spectroscopy

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