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 language | English |
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Pages (from-to) | 809-819 |
Number of pages | 11 |
Journal | ACS Catalysis |
Volume | 11 |
Issue number | 2 |
DOIs | |
Publication status | Published - 15 Jan 2021 |
Keywords
- catalyst deactivation
- cobalt carbide
- Fischer-Tropsch synthesis
- heterogeneous catalysis
- X-ray spectroscopy