Physico-Chemical Properties of Cobalt-Ruthenium (10% Co-0.5% Ru) Catalysts Supported on Binary Oxides 8.5%ZrO2/Support (SiO2, Al2O3, TiO2) for Fischer-Tropsch Synthesis

摘要

The promotion of Fischer-Tropsch catalysts 10%Co/Al2O3, 10%Co/SiO2,10%Co/TiO2 by 0.5% Ru and the modification of supports by 8.5 wt% ZrO2 have been studied. The following properties: catalyst specific surface area as well as reducibility and dispersion of metallic phase were studied by different techniques: BET, TPR, and H2 chemisorption. The modification of supports by nonreducible ZrO2, results in a decrease of cobalt oxide reduction on Al2O3 and TiO2 but not on SiO2 supports. Additionally the enhancement of cobalt dispersion was found for all catalysts with ZrO2 modified supports. The impact of Ru promotion is likely due to the stabilization of applied supports, prevention or blockage of interaction between surface Co species and support and an increase in cobalt oxide reducibility to the catalytically active metallic cobalt phase.