Accelerated Deactivation and Activity Recovery Studies of Ruthenium and Rhenium Promoted Cobalt Catalysts in Fischer-Tropsch Synthesis

摘要

Accelerated deactivation of Co/Al_2O_3 catalysts in Fischer-Tropsch synthesis and the effect of Re and Ru as the catalytic promoters are reported. 15wt% Co/Al_2O_3 catalyst and 1wt% Ru and 1.4wt% Re promoted cobalt catalysts have been formulated and extensively characterized. The deactivation of the unpromoted cobalt catalyst and those promoted with Re and Ru were studied by accelerated method at 260℃. Different sources of deactivation were identified. The amount of activity recovery after regeneration at the conditions of low temperature treatment at 260℃ and high temperature treatment at 400℃ for the used promoted and unpromoted catalysts were detrmined. It was revealed that promoted catalyst deactivated faster than unpromoted ones. High temperature H_2 treatment restored the catalytic activity of the catalysts more than 97.5%.