Abstract
The presence of polyethylene glycol (PEG) in a co-impregnation process reduced the crystallite size of Co3O4 and formed a close contact between the uniformly distributed RuO2 and Co3O4 particles on CoRuOx/SiO2 sample after calcination. This structure facilitated the reduction of small Co3O4 particles. The resultant small Co0 particles and Co-Ru synergistic effect enhanced the Co-time yield and turnover frequency (TOF) in Fischer–Tropsch synthesis. Comparatively, the PEG-free process led to the inhomogeneous distribution and segregation of RuO2 particles. These separated RuO2 precursors could improve the reduction of Co3O4, but had less impact on TOF in contrast to Ru-free Co/SiO2 catalyst.
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