Abstract
Zr, Ca and Mn promoted Co/SiC catalysts have been prepared with constant loadings of 15 wt% Co and 5 wt% Zr or Ca or Mn and investigated for the Fischer–Tropsch synthesis. It was revealed that the crystallite size of Co3O4 increased from 15 to 37, 22, 16 nm and the corresponding Co0 dispersion decreased from 8.3 to 3.5, 5.8 and 7.8% with the addition of Zr, Ca or Mn promoter. The large crystallite size and outer surface location of Co species for the Co/Zr/SiC could account for the low interaction between Co and SiC support, which led to the easy reduction. Compared to the CO conversion (71%) of Co/SiC catalyst, it increased to 82 and 80% for the Co/Zr/SiC and Co/Mn/SiC catalysts, whereas it declined to 13% for the Co/Ca/SiC catalyst. Furthermore, the product distribution took a different trend: it was shifted towards the products of long chain hydrocarbons (C5–C22) for Co/Zr/SiC and Co/Mn/SiC catalysts, however, light products (methane and C2–C4) were the major products for the Co/Ca/SiC catalyst.
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