Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 272, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118950
Keywords
Higher alcohols; syngas; Mo based catalysts
Funding
- China Scholarship Council (CSC)
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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 degrees C, 8.7 MPa, a GHSV of 4500 mL g(-1) h(-1) and a H-2/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.
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