Abstract
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.
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