Enhanced C3+alcohol synthesis from syngas using KCoMoSx catalysts: Effect of the Co-Mo ratio on catalyst performance

Xiaoying Xi, Feng Zeng, Huatang Cao, Catia Cannilla, Timo Bisswanger, Sytze de Graaf, Yutao Pei, Francesco Frusteri, Christoph Stampfer, Regina Palkovits, Hero Jan Heeres

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Abstract

K-Co-MoSx catalysts varying in Co content were prepared to investigate the role of Co in this catalyst formulation for the synthesis of C3+ alcohols from syngas. The Co-MoSx precursors and the best performing K-doped version were characterized in detail and the amount of active cobalt sulfide and mixed metal sulfide (Co-Mo-S) phases were shown to be a function of the Co content. The catalysts were tested in a continuous set-up at 360 °C, 8.7 MPa, a GHSV of 4500 mL g-1 h-1 and a H2/CO ratio of 1. The highest alcohol selectivity of 47.1%, with 61% in the C3+ range, was obtained using the K-Co-MoSx catalyst with a Co/(Co + Mo) molar ratio of 0.13. These findings were rationalized considering the amount and interactions between cobalt sulfide and Co-Mo-S or MoS2 phases. Process studies followed by statistical modeling gave a C3+ alcohol selectivity of 31.0% (yield of 9.2%) at a CO conversion of 29.8% at optimized conditions.

Original languageEnglish
Article number118950
Number of pages11
JournalApplied catalysis b-Environmental
Volume272
DOIs
Publication statusPublished - 5-Sep-2020

Keywords

  • Higher alcohols
  • syngas
  • Mo based catalysts
  • TEMPERATURE-PROGRAMMED REDUCTION
  • MOLYBDENUM SULFIDE CATALYSTS
  • HIGHER ALCOHOLS SYNTHESIS
  • SYNTHESIS GAS
  • HYDROTHERMAL SYNTHESIS
  • ACTIVATED CARBON
  • MIXED ALCOHOLS
  • HYDRODESULFURIZATION
  • HYDROGENATION
  • CONVERSION

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