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

Leila Negahdar, Xiaoying Xi, Feng Zeng, J. G.M. Winkelman, Hero Jan Heeres*, Regina Palkovits*

*Corresponding author for this work

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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–1h–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.

Original languageEnglish
Pages (from-to)419-427
Number of pages9
JournalInternational Journal of Chemical Kinetics
Volume53
Issue number3
DOIs
Publication statusPublished - Mar-2021

Keywords

  • carbon chain growth
  • kinetics
  • mechanism
  • mixed alcohols
  • molybdenum disulfide
  • syngas

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