Abstract
16.6%Co/γ-Al 2O 3 catalysts prepared by incipient wetness impregnation method were used for Fischer-Tropsch synthesis. The support was pre-treated with different concentration of NH 4NO 3 aqueous solution. The effect of support pre-treatment on the properties of support and performance of supported-cobalt-based catalysts was investigated. To treat the support with NH 4NO 3 aqueous solution enlarged the pore of γAl 2O 3, decreased the impurity Na 2O content, and weakened the surface acidity of γAl 2O 3. The change in the properties of the support decreased the interaction between cobalt species and support, enhanced the CO hydrogenation rate and the C 5+ selectivity. For all catalysts, increasing the reaction temperature increased the CO hydrogenation rate or the CO conversion, slightly decreased the total hydrocarbon selectivity, and favored the formation of methane and light hydrocarbons, while the chain growth probability decreased. For 16.6%Co/γAl 2O 3 catalysts, prepared with the support treated with 100 g/L NH 4NO 3 aqueous solution, the CO conversion, the CH 4 selectivity, and the C 5+ selectivity were 83.13%, 6.86% and 82.75% respectively, and the chain growth probability was 0.83 under the condition of 493 K, 1.5 MPa, 500 h −1 and the molar ratio of H 2 to CO being 2.0 in feed.
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