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CO hydrogenation over K‐Co‐MoSₓ catalyst to mixed alcohols: A kinetic analysis

Negahdar, L; Xi, X; Zeng, F; Winkelman, JGM; Heeres, HJ; Palkovits, R; (2020) CO hydrogenation over K‐Co‐MoSₓ catalyst to mixed alcohols: A kinetic analysis. International Journal of Chemical Kinetics 10.1002/kin.21453. (In press). Green open access

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Abstract

Higher alcohol synthesis (HAS) from syngas is one of the most promising approaches to produce fuels and chemicals. Our recent investigation on HAS showed that potassium‐promoted cobalt‐molybdenum sulfide is an effective catalyst system. In this study, the intrinsic kinetics of the reaction were studied using this catalyst system under realistic conditions. The study revealed the major oxygenated products are linear alcohols up to butanol and methane is the main hydrocarbon. The higher alcohol products (C3+) followed an Anderson‐Schultz‐Flory distribution while the catalyst suppressed methanol and ethanol formation. The optimum reaction conditions were estimated to be at temperature of 340°C, pressure of 117 bar, gas hourly space velocity of 27 000 mL g–1 h–1 and H2/CO molar feed ratio of 1. A kinetic network has been considered and kinetic parameters were estimated by nonlinear regression of the experimental data. The results indicated an increasing apparent activation energy of alcohols with the length of alcohols except for ethanol. The lower apparent activation energy of alcohols compared with hydrocarbon evidenced the efficiency of this catalyst system to facilitate the formation of higher alcohols.

Type: Article
Title: CO hydrogenation over K‐Co‐MoSₓ catalyst to mixed alcohols: A kinetic analysis
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/kin.21453
Publisher version: https://doi.org/10.1002/kin.21453
Language: English
Additional information: Copyright © 2020 Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
Keywords: carbon chain growth, kinetics, mechanism, mixed alcohols, molybdenum disulfide, syngas
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10114705
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