Preparation and catalytic performence of cobalt-based catalysts

Cobalt-based catalysts for Fischer-Tropsch(F-T) synthesis were prepared by wet impregnation with γ-Al_2O_3 as the carrier. The catalytic performances of the catalysts for F-T synthesis were studied in a fix-bed flow reactor. The influence of cobalt sources, calcination temperature, cobalt loadings, reaction temperature and feed gas space velocity on the catalytic activity of Co/γ-Al_2O_3 catalysts and the yields of F-T synthesis products were investigated. The stability of Co/γ-Al_2O_3 catalyst was also studied. The results indicated that the optimum preparation condition was as follows: cobalt nitrate as the precursors, calcination temperature 400℃ and cobalt loading 10% (mass fraction). CO conversion of 69.1% and the yield of C_5~+ hydrocarbon of 89.6% were attained, respectively, under the reaction condition of reaction temperature 230℃, reaction pressure 2 MPa, space velocity 1800h~(-1), n(H_2):n(CO)=2 and running for 60h.