Cobalt Carbon Bonding during Carbon Hydrogasification Revealed by ⁵⁹Co Internal Field NMR
Abstract
Cobalt catalysts are involved in many chemical processes crucial to the energy transition and to the shift from oil-to bio-sourced chemicals. Thanks to the ferromagnetic character of cobalt metal, these catalysts can be studied by nuclear magnetic resonance (NMR) in the internal magnetic field of the particle. Using carbon hydrogasification as an example, this work illustrates the potential of ⁵⁹Co internal field (IF) NMR to study the Co crystallite phase transitions and to distinguish quantitatively, within the limits of the skin effect, different Co-C intermediates present inside a sample containing cobalt and carbon. Here the main Co-C intermediates evidenced are a Co/C solid-solution and a Co₃C phase. When using a ball milling process for carbon hydrogasification, a high amount of Co-C intermediates forms, and the reaction rate is increased by several orders of magnitude compared to a classic catalytic reaction (in a fixed-bed reactor). In this work, the results of the Co catalyst study by ⁵⁹Co IF NMR are compared to the reaction rate of carbon hydrogasification over the course of such a ball milling process. We find a direct relationship between the amount of Co-C intermediates inside the sample and the reaction rate. This confirms that, like for a carbon hydrogasification reaction under classic conditions, the carbon dissociation and formation of Co-C bonds is the rate determining step.
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BibTeX
@article{scholzen2026cobalt,
title = {{Cobalt Carbon Bonding during Carbon Hydrogasification Revealed by ⁵⁹Co Internal Field NMR}},
author = {Pascal Scholzen and Gao-Feng Han and Guillaume Lang and Andrey Andreev and Jong-Beom Baek and Jean-Baptiste d’Espinose de Lacaillerie},
journal = {Journal of Physical Chemistry C},
year = {2026},
month = sep,
doi = {10.1021/acs.jpcc.4c02634},
url = {https://hal.science/hal-05734822v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Cobalt Carbon Bonding during Carbon Hydrogasification Revealed by ⁵⁹Co Internal Field NMR
AU - Pascal Scholzen
AU - Gao-Feng Han
AU - Guillaume Lang
AU - Andrey Andreev
AU - Jong-Beom Baek
AU - Jean-Baptiste d’Espinose de Lacaillerie
PY - 2026
DA - 2026/09/01
JO - Journal of Physical Chemistry C
DO - 10.1021/acs.jpcc.4c02634
UR - https://hal.science/hal-05734822v1
AB - Cobalt catalysts are involved in many chemical processes crucial to the energy transition and to the shift from oil-to bio-sourced chemicals. Thanks to the ferromagnetic character of cobalt metal, these catalysts can be studied by nuclear magnetic resonance (NMR) in the internal magnetic field of the particle. Using carbon hydrogasification as an example, this work illustrates the potential of ⁵⁹Co internal field (IF) NMR to study the Co crystallite phase transitions and to distinguish quantitatively, within the limits of the skin effect, different Co-C intermediates present inside a sample containing cobalt and carbon. Here the main Co-C intermediates evidenced are a Co/C solid-solution and a Co₃C phase. When using a ball milling process for carbon hydrogasification, a high amount of Co-C intermediates forms, and the reaction rate is increased by several orders of magnitude compared to a classic catalytic reaction (in a fixed-bed reactor). In this work, the results of the Co catalyst study by ⁵⁹Co IF NMR are compared to the reaction rate of carbon hydrogasification over the course of such a ball milling process. We find a direct relationship between the amount of Co-C intermediates inside the sample and the reaction rate. This confirms that, like for a carbon hydrogasification reaction under classic conditions, the carbon dissociation and formation of Co-C bonds is the rate determining step.
SN - 1932-7447
SN - 1932-7455
ER -