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Citation: QIU Cheng-wu, WU Bao-shan, CHANG Qiang, LI Yong-wang. Effect of ruthenium addition on the performance of Co/SiO2 catalyst for Fischer-Tropsch synthesis[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(10): 1230-1238. shu

Effect of ruthenium addition on the performance of Co/SiO2 catalyst for Fischer-Tropsch synthesis

  • 1.

    1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

  • Corresponding author: WU Bao-shan, 
  • Received Date: 10 March 2015
    Available Online: 16 May 2015

    Fund Project: 国家自然科学基金(21273261)资助项目 (21273261)

  • Three Co/SiO2 catalysts doped with different amounts of Ru were prepared by incipient wetness impregnation. These catalysts were characterized by N2 physisorption, XRD, H2-TPD, DRIFTS, etc.; their catalytic performance in Fischer-Tropsch (F-T) synthesis was investigated in a micro fixed-bed reactor. The F-T reaction results showed that the Co/SiO2 catalysts doped with Ru exhibit higher CO conversion, higher turnover frequency (TOF), lower selectivity to CO2 and CH4, as well as lower ratio of olefin to paraffin, in comparison with undoped Co/SiO2. FT-IR spectra indicated that the Co-O bond in the as-prepared catalyst is weakened by the addition of Ru, which facilitates the reduction of the Co/SiO2 catalysts; such results are also supported by the H2-TPR profiles and XRD patterns of the reduced catalysts. The main cobalt phase in the reduced catalyst with 0.5% (by weight) of Ru is in a hexagonal close packing (hcp) structure. CO-DRIFTS results revealed that the peak of linearly adsorbed CO is red-shifted by the addition of Ru, suggesting an improvement on the dissociation of adsorbed CO. CO-TPD results showed that the ratio of COads/Cos and CO*/Cos on catalysts surface is increased by the addition of Ru, which may contribute to the decrease of the selectivity to CH4 in F-T synthesis.
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