La-ZrO_2 and Ru-ZrO_2 Promoted Co/SiO_2 Catalysts for Fischer-Tropsch Synthesis

摘要

The performance of ZrO_2-La promoted silica supported cobalt catalyst (100Co/15ZrO_2/ 100Aerosil/0.66La) was compared to the ZrO_2-Ru promoted one, 100Co/15ZrO_2/100Aerosil/0.66Ru, in Fischer-Tropsch synthesis (FTS). These catalysts were prepared by co-precipitation and incipient wetness impregnation methods. The characterization by XRD confirmed the cobalt phase of Co_3O_4 in both catalysts. For their catalytic activity on FTS reaction, the results preliminarily showed the higher methane fraction (60-80%) and lower C_2-C_4 (10-20%) and C_(5+) (10-20%) fractions in ZrO_2-La promoted catalyst compared to the fractions of methane (20-40%), C_2-C_4 (20-50%), and C_(5+)(10-60%) from the ZrO_2-Ru promoted catalyst. During reaction, the maximum n-paraffin selectivity of 40% was at C_3 and the hydrocarbon chain was up to C_6 for the ZrO_2-La promoted catalyst. For the ZrO_2-Ru promoted catalyst, the result showed the maximum n-paraffin of C_3 at 30 min of reaction time. When the reaction time increased, the maximum n-paraffin selectivity shifted toward higher C number but levelled off (15%) and the hydrocarbon chain was up to C_(16).