Auto-reduction Behaviour of Cobalt on Graphitic Carbon Nitride Coated Alumina Supports for Fischer-Tropsch Synthesis

The graphitic carbon nitride (g-C3N4)-coated alumina (CN-Al) is investigated as a support material for a cobalt-based Fischer-Tropsch synthesis (FTS) catalyst. The g-C3N4 blocks the interaction between cobalt and alumina to hinder the formation of irreducible cobalt oxide species, and improves the dispersion of metallic cobalt species on the CN-Al support. Furthermore, the coated g-C3N4 is decomposed during the pre-annealing process under inert condition to evolve reductive carbon monoxide gas that directly reduces the cobalt oxide species to metallic cobalt. Hence, the catalyst can be activated without typical hydrogen pretreatment. Moreover, the reduction promotion by expensive noble metals like Pt is not needed either. Because of the improved dispersion and reducibility of the cobalt species on CN-Al support, the catalytic FTS activity is higher compared to the conventional Co/Al2O3 catalyst.

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