مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

An extensive study ofFischer-Tropsch synthesis (FTS) on alumina-supported cobalt catalysts with different amounts of cobalt is reported. Up to 40 wt % of cobalt, is added to the catalysts by impregnation method. The effect ofthe cobalt loading on the reducibility ofthe cobalt oxide species, dispersion of the cobalt, average clusters size, water-gas shift (WGS) activity and activity and selectivity ofFTS is investigated. Increasing the cobalt loading resulted in increasing the average cobalt cluster size, improvements in the reducibility of C030 4, decreasing the cobalt surface interaction with the support and decreasing the dispersion of cohalt. The maximum concentration of active surface CoO sites and FTS activity are achieved for the 34 wt% cobalt loading. While the maximum WGS activity is achieved for the 40 wt % cobalt loading. The methane selectivity in the catalyst with 40 wt % ofcobalt loading was about 43.7 % less compared to that ofthe less reducible 8 wt % cobalt catalyst. The C5+ selectivityfor the 40 wt % cobalt catalyst was 60.8% higher than that ofthe 8 wt % Cobalt catalyst.