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The effects of pretreatment methods (DR, R, ROR) on the microstructure of Co/SiO2catalysts and the activity for Fischer-Tropsch synthesis (FTS) were investigated. The pretreated catalysts were characterized by TEM, HRTEM, XRD, XPS, H2-TPD, TG and TPR. The results showed that after the pretreatments, specific morphological of the Co species changed, forming new Co active surface species. The Co particles redispersed and the Co species was facile to be re-reduced. The Co/SiO2catalysts pretreated by different method showed different catalytic performance. The catalyst treated by the reduction-passivation had higher activity and C5+selectivity for FTS.

CoFe2O4nanoarray catalysts were fabricated on iron foam by a controlled process involving the hydrothermal growth and calcinations of iron-doped cobalt carbonate hydroxide hydrate (CoFe-CHH) nanowires precursors. The crystalline phase, microstructure and component of CoFe2O4nanoarrays were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The produced catalysts were used for Fischer-Tropsch synthesis and the nanoarray catalysts displayed a high CO conversion rate of 69% at 5 L/g/h and a better performance than powder catalysts.