Abstract
Ru-SiO2 catalysts with uniform structure were prepared by the alkoxide method using various Ru precursors, and used to catalyze the Fischer-Tropsch (F-T) synthesis 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. All catalysts showed stable activity during the F-T reaction for 40 h. The CO conversion was relatively low over the catalyst prepared from ruthenium chloride, because of the trace amounts of residual Cl on the surface. The catalysts prepared from ruthenium nitrosyl nitrate and ruthenium acetylacetonate showed high activity, with suppression of CH4 and CO2 formation. The CO conversion linearly increased with the loading amounts of Ru, indicating identical dispersion of Ru regardless of the amount. The olefin/paraffin ratio of the products could be explained in terms of the electronic state of Ru on the catalysts.
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