Abstract:
Supported cobalt catalysts (Co@C-ZnZrO
2 and Co/ZnZrO
2) were prepared through a metal-organic frameworks (MOFs)-mediated synthesis strategy. The influence of MOFs pyrolysis on the structure and Fischer-Tropsch synthesis performance of supported cobalt catalysts was investigated. The crystalline phase and microstructure of supported cobalt catalysts were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), N
2 adsorption-desorption and X-ray photoelectron spectroscopy (XPS). The Co/ZnZrO
2 showed the CO conversion of 18.1% and the C
5 + selectivity of 77.4%, whereas the Co@C-ZnZrO
2 exhibited the CO conversion of 8.5% and the C
5 + selectivity of 35.2%. The excellent CO conversion for Co/ZnZrO
2 was attributed to the more exposure of active Co sites. Meanwhile, the activity of Co sites on Co@C-ZnZrO
2 catalyst was restricted by the carbon layer, suppressing the adsorption and activation of syngas on Co sites.