Comparison of the Kinetics of the Fischer-Tropsch Synthesis Reaction Between Alumina and Silica Supported Cobalt Catalysts as a Function of Metal Loading

摘要

Water, as one of the main Fischer-Tropsch (FT) products, played important role in inhibiting active sites on the surface of the cobalt catalyst during FT reaction [1] consequently, it affected greatly the FT performance parameters of the catalyst. A kinetic method using an empirical kinetic model, -r_(CO) = kP_(CO)~aP_(H2)~b/(1+ mP_(H2O)/P_(H2)) (1) has proven to be reliable in quantifying a reversible H2O effect in recent years [2-4]. In this paper, we conducted kinetic experiments over 15-25% Co/SiO2 catalysts and a 25%Co/Al2O3 catalyst in order to quantitatively identify the effect of support type on the impact of water during FT, as well as the sensitivity of Co cluster size to the water effect.