Study On The Promotional Efficiency Of Ru For Co-based Fischer-Tropsch Synthesis Catalysts

Supported Co-based catalyst is a very important Fischer-Tropsch（F-T） synthesis catalyst for the production of clean liquid fuels. Incontrast to iron-based catalyst, the supported Co-based catalyst has higheractivity, higher stability and lower selectivity of CO₂, it therebyrepresents the preferred catalyst for the low temperature F-T synthesis.For supported Co-based catalyst, the addition of Ru promoter canincrease the catalyst activity, selectivity and stability of the catalyst.However, the structural requirement of its promotional efficieny remainsunclear.In this paper, we prepared several supported CoRu catalysts withgood dispersion and reducibility. Different characterization methodsincluding TPR, XRD, TEM, H₂-chemisorption and FT-IR were used tostudy the promotional efficiency of Ru. Our conclusions are shown asfollows.The promotional efficiency of Ru depends on the position and distribution of RuO₂precursors. The uniformly distributed RuO₂paticlesthat closely contact with Co₃O₄enable to increase the reducibility ofCo₃O₄particles and the turnover frequency of catalyst. While theseparated and non-uniformly distributed RuO₂particles only improve thereducibility of catalyst.