• relation between hydrocarbon selectivity and cobalt particle size for alumina supported cobalt fischer–tropsch catalysts

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 786
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the relation between hydrocarbon selectivity and cobalt particle size was studied using different alumina supports. alumina phases, i.e. δ-, θ- and α-al2o3 were produced from a small and a medium pore γ-al2o3by heat treatment. all catalysts were prepared by incipient wetness impregnation resulting in a cobalt loading of 12, 20 and 30 wt.% cobalt. the catalysts were tested in a fixed bed reactor at 20 bar, 483 k and h2/co = 2.1. the relation between methane, olefin and c5+ selectivities was studied for 2–14 nm cobalt particles supported on δ- and θ-al2o3 supports prepared from the two different γ-al2o3. the c5+ selectivity increases with increasing co particle size for particles less than 8–9 nm where the selectivity goes through a maximum. the c5+ selectivity decreases for larger co particles and then seems to approach a constant value independent of the alumina phase and pore size. the lowest ch4 selectivity and the highest olefin to paraffin ratio were obtained at maximum c5+ selectivity.

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