Study on the F-T reaction performance of Co/Al₂O₃-SiO₂ catalyst

The γ-Al₂O₃ modified with different content of SiO₂ by impregnation method was used as supports to prepare Co/Al₂O₃ catalyst.The effects of SiO₂ additives on phase structure of the cobalt-based catalysts, reduction behavior and the influence on the F-T synthesis performance were studied by using N₂ adsorption, XRD, H₂-TPR and XPS characterization methods and activity test.The results showed that with the introduction of SiO₂, the interaction between support and cobalt was effectively weakened, thus the reducibility and catalytic activity of the catalysts were significantly improved.However, when the amount of SiO₂ continued to increase, the reduction degree of the catalyst continued to improve, but the dispersion decreased by 32% at the same time.Compared with unmodified Co/Al₂O₃ catalyst, the activity of the catalyst remained basically unchanged.