Raising Distillate Selectivity and Catalyst Life Time in Fischer-Tropsch Synthesis by Using a Novel Dual-Bed Reactor

Abstract

<em>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 </em><em>methane selectivity in the </em><em>dual-bed reactor</em><em> was about </em><em>18.9 % less compared to that of the </em><em>single-bed reactor</em><em>. </em><em>The</em><em>C₅₊ </em><em>selectivity </em><em>for the dual-bed reactor was 10.9 % higher</em><em> than that of the single-bed reactor. </em><em>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.</em>