Promotion effect of the addition of Eu to Co/silica catalyst for Fischer–Tropsch synthesis

• Co/silica (Eu-Co/SiO2) catalysts with 1, 5, 10, and 20% Eu were synthesized.
• The catalysis with 1%Eu showed the highest FT activity.
• XANES analysis revealed that the addition of 1% Eu enhanced the reducibility of the Co oxides.

Co/silica (Eu–Co/SiO2) catalysts with 1, 5, 10, and 20% Eu were synthesized and their catalytic activities towards Fischer–Tropsch synthesis were investigated in a slurry-phase reactor. The addition of 1% Eu improved the activity of the Co/SiO2 catalyst, while more than 5% Eu reduced it. XRD and XANES analyses revealed that Eu has a negligible effect on the Co metal particle sizes of the reduced catalysts and that 1% Eu enhanced the reducibility of the Co oxides while excess Eu was ineffective. This is the first report demonstrating the promotion effect of Eu on FTS reaction of Co/SiO2 catalyst.

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