MOFs derived Co-based catalyst is a kind of potential Fischer-Tropsch synthesis (FTS) catalyst with superior cobalt dispersion and high cobalt loading, but they usually exhibit low activity and high CH₄ selectivity. In this study, Al sources were introduced during the synthesis of ZIF-67 by in-situ doping method to obtain the high performance Co₃O₄/Al₂O₃-x catalysts. The effect of different Al sources including aluminum chloride hexahydrate, aluminum isopropoxide and aluminium nitrate on the FTS performance of the Co₃O₄/Al₂O₃-x catalysts was investigated. Results indicated that the prepared Co₃O₄/Al₂O₃-x catalysts exhibited better FTS activity and lower CH₄ selectivity than the Co@C catalyst obtained by direct carbonization of ZIF-67. The Co₃O₄/Al₂O₃-x catalysts with different Al sources showed different FTS performance. The Co₃O₄/Al₂O₃-III catalyst exhibited the highest FTS activity which was ascribed to its strongest metal-support interaction and the most active sites. Moreover, due to the different physical properties, the Co₃O₄/Al₂O₃-III catalyst showed higher gasoline selectivity while the Co₃O₄/Al₂O₃-II catalyst showed higher diesel selectivity.

Zhenhua Li

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