raising distillate selectivity and catalyst life time in fischer-tropsch synthesis by using a novel dual-bed reactor

in a novel dual bed reactor fischer-tropsch synthesis was studied by using two diffrent cobalt catalysts. an alkali-promoted cobalt catalyst was used in the first bed of a fixed-bed reactor followed by a rutenuim promoted cobalt catalyst in the second bed. the activity, product selectivity and accelerated deactivation of the system were assessed and compared with a conventional single bed reactor system. the methane selectivity in the dual-bed reactor was about 18.9 % less compared to that of the single-bed reactor. thec5+ selectivity for the dual-bed reactor was 10.9 % higher than that of the single-bed reactor. accelerated deactivation of the catalysts in the dual-bed reactor was 42 % lower than that of the single-bed reactor. it was revealed that the amount of catalysts activity recovery after regeneration at 400 oc in the dual-bed system is higher than that of the single-bed system.