Catalytic behaviors of mixed TiO_2-SiO_2-supported cobalt Fischer-Tropsch catalysts for carbon monoxide hydrogenation

摘要

In the present study, the catalytic behaviors of mixed TiO_2-SiO_2-supported cobalt (Co) Fischer-Tropsch (FT) catalysts via carbon monoxide (CO) hydrogenation were investigated. The various weight ratios of TiO_2/SiO_2 were prepared, then consequently impregnated with the cobalt precursor. After calcination, the various samples were characterized using XRD, Raman spectroscopy, scanning electron microscopy/energy dispersive X-ray (SEM/EDX), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and H_2 chemisorption. The characteristics of various samples were further discussed in more details. Based on the reaction study, it revealed that the presence of titania in the mixed supports resulted in decreased activities dramatically. However, longer chain hydrocarbons such as C_2-C_5 can be obtained substantially with increasing the amounts of titania in the mixed supports.