《Table 3.The average crystallite size of the calcined catalysts determined by XRD.》

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《Fischer–Tropsch synthesis using Co and Co-Ru bifunctional nanocatalyst supported on carbon nanotube prepared via chemical reduction method》

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Similarly，as shown in Table 2 for A1catalyst，the surface area and the pore volume decreased from 219 to165 m2g-1and from0.515 to 0.446 m L/g，respectively.Therefore，these results presented that more Co particles had been loaded at the functionalized CNTs thanγ-Al2O3so that they were in agreement with those given in the previous work[28].In fact，the loading of Co and Ru metal particles at the porous supports during the catalysts preparation may be owing to dilution effect of these supports and partial blockage of its pores that led to accumulation of these active metals in the narrow capillaries，which in turn reduced the surface area and pore volume[7，29].In addition，as seen in Table 2 the BET surface areas of C1–C2catalysts（using chemical reduction）were higher than the I1-I2catalysts（using impregnation method）.Thus，it indicated that applying chemical reduction method led to lesser pore blockage of the support by Co particles in compared with those obtained by impregnation method.Finally，one can observe that the pore volume and average pore size not changed considerably by the enhancement of ruthenium loading at the range of 1%-4%，while the surface area reduced from 169.4 to 160.7 m2/g.