Cerium doped Co/AC catalysts for higher alcohols synthesis from syngas

•Co-xCe/AC catalysts were prepared for the synthesis of mixed higher alcohols.•The synergistic effect of Co0 and Co2C are responsible for the C2+OH alcohols.•The total alcohol selectivity depends on surface oxygen vacancies.•The Co-7.5Ce/AC catalyst shows the excellent performance for the alcohols s...

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Veröffentlicht in:Molecular catalysis 2023-07, Vol.546, p.113270, Article 113270
Hauptverfasser: Bai, Kaiyu, Huang, Jinhua, Tian, Min, Han, Chun, Huang, Wei
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Sprache:eng
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Zusammenfassung:•Co-xCe/AC catalysts were prepared for the synthesis of mixed higher alcohols.•The synergistic effect of Co0 and Co2C are responsible for the C2+OH alcohols.•The total alcohol selectivity depends on surface oxygen vacancies.•The Co-7.5Ce/AC catalyst shows the excellent performance for the alcohols synthesis. Higher alcohols synthesis (HAS) from CO hydrogenation has attracted a considerable attention owing to their utilization in fuels and chemical intermediates. However, it is still very difficult to improve the selectivity of higher alcohols via the Fischer-Tropsch process. Based on the understanding of the current research progress, in the present work, a series of the Ce doped activated carbon loaded Co catalysts were prepared and characterized by XRD, XPS, N2 adsorption-desorption, H2-TPR, and CO2-TPD-MS etc. It was found that there is a linearly positive correlation between the selectivity of total alcohols and oxygen vacancies, so the improvement of the selectivity to total alcohols can be achieved by increasing the number of oxygen vacancies on the catalyst surface. The Co-7.5Ce/AC catalyst showed the maximum oxygen vacancy ratio (46.5%), exhibiting the best total alcohols selectivity (23.5%). This work revealed the roles of oxygen vacancies in the synthesis of higher alcohols from syngas and provided a new idea for the development of Co-based catalysts for the process. [Display omitted]
ISSN:2468-8231
2468-8231
DOI:10.1016/j.mcat.2023.113270