Synthesis of mixed alcohols with enhanced C3+ alcohol production by CO hydrogenation over potassium promoted molybdenum sulfide

Feng Zeng, Xiaoying Xi, Huatang Cao, Yutao T. Pei, Hero Jan Heeres, Regina Palkovits

OnderzoeksoutputAcademicpeer review

38 Citaten (Scopus)
183 Downloads (Pure)

Samenvatting

Alcohol mixtures with high C3+ alcohols content can enhance the performance of alcohol mixtures as a blend component in gasoline. Sulfur-resistant potassium promoted molybdenum sulfide (K-MoS2) catalysts enabled synthesizing mixed alcohols through CO hydrogenation. However, the liquid oxygenate selectivity and yield of K-MoS2 catalysts are usually low, and the alcohols follow the Anderson-Schulz-Flory (ASF) distribution, which means methanol and ethanol present the main liquid oxygenates. To achieve high liquid oxygenate selectivity and yield enhancing C3+ alcohol production, we designed multilayer K-MoS2 catalysts possessing a well-contacted MoS2 and KMoS2 phase, respectively. The reduced rim site exposure and the well-contacted MoS2-KMoS2 dual site induced by the multilayer structure enhance the chain growth through CHx β-addition and CO insertion. Accordingly, the observed higher alcohol formation deviates from the ASF distribution. By tailoring the K/Mo ratio, catalysts with varying composition of MoS2 and KMoS2 phases were obtained for suppressing the formation of hydrocarbons and CO2 effectively. An optimized production of liquid oxygenates with enhanced C3+ alcohol production under appropriate reaction temperature became possible. The optimized catalysts have liquid oxygenate selectivity and yield of 29.1–32.7% and 7.9–10.6%, respectively, yet with good stability. C3+ alcohols take up more than 46% (carbon atom fraction) in the liquid oxygenate. The C3+ alcohol yield reaches 3.6–5.1%.
Originele taal-2English
Pagina's (van-tot)232-241
Aantal pagina's10
TijdschriftApplied Catalysis B: Environmental
Volume246
Vroegere onlinedatum23-jan.-2019
DOI's
StatusPublished - 5-jun.-2019

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