2007 Volume 50 Issue 6 Pages 349-353
Uniform pore sizes of 10 wt%Ru-SiO2 catalysts prepared by the alkoxide method were varied in the range of 4-8 nm, by adding formamide (FA) at the sol-gel preparation stage. The prepared catalysts were used to catalyze the Fischer-Tropsch (F-T) reaction in the slurry phase under the reaction conditions of T=503 K, P=1 MPa, H2/CO=2/1, and W/F=5 g-catal.h/mol. The Ru particle sizes estimated by H2 adsorption increased with increasing pore size, although the Ru crystallite sizes evaluated by XRD line broadening were only slightly changed. The selectivity for CH4 decreased and the selectivity for higher hydrocarbons increased with increasing pore size of the catalysts, caused by diffusivity of the slurry solvent and/or the products in the uniform meso-pores, or uniform Ru particle size effects.
