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Citation: SUN Yan, SUN Qi-wen, JIANG Fan-kai, ZHANG Zong-sen, LIU Ji-sen. Effect of promoters on the performance of Co/Al2O3 catalysts for Fischer-Tropsch synthesis in slurry reactors[J]. Journal of Fuel Chemistry and Technology, ;2012, 40(11): 1336-1340. shu

Effect of promoters on the performance of Co/Al2O3 catalysts for Fischer-Tropsch synthesis in slurry reactors

  • 1.

    Shanghai Yankuang Energy R & D Co., Ltd., State Key Laboratory of Coal Liquefaction and Coal Chemical Technology, Shanghai 201203, China

  • Corresponding author: SUN Yan, 
  • Received Date: 8 February 2012
    Available Online: 16 April 2012

    Fund Project: 国家重点基础研究发展规划(973计划, 2010CB736203)。 (973计划, 2010CB736203)

  • The effect of ZrO2, Ru and/or Pt promoters on the structure and performance of Co/Al2O3 catalysts for Fischer-Tropsch synthesis in a slurry reactor was investigated. The results indicated that ZrO2 modification may prevent or reduce the formation of CoAl2O4 phase on the catalysts and improve the reduction of cobalt species, which is beneficial to the increase of the catalytic activity, the decrease of methane selectivity, as well as the improvement of C5+ selectivity. Small amounts of ruthenium and platinum as promoter are able to lower the reduction temperatures of cobalt species (Co3O4→CoO and CoO→Co0) and to get a high reduction extent; as a result, the catalysts promoted with noble metals exhibit much higher activity in CO hydrogenation. Moreover, the impregnation sequence of various components also has an important influence on the performance of resultant catalysts in Fischer-Tropsch synthesis. Impregnation of γ-Al2O3 with Zr at first, the formation of irreducible cobalt aluminate can be prevented; co-impregnation of γ-Al2O3 with Co and Ru can enhance the interaction between cobalt and ruthenium, which benefits to the reduction of cobalt oxides; sequential impregnation of γ-Al2O3 with Co and Pt is beneficial to the dispersion of cobalt species. As a result, the sequentially impregnated catalyst Co-Pt-ZrO2/Al2O3 performs excellently in the Fischer-Tropsch synthesis.
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