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Uniformly dispersed RuSiO2 catalysts prepared by the alkoxide method show stable Fischer-Tropsch (F-T) reaction activity in the slurry phase1), and is thought to result from the ultra uniform structure. However, small pore size of the catalyst will generally limit the mobility of higher molecular weight products and the slurry solvent because of the low diffusivity2),3), which may give rise to unfavorable secondary reactions, such as cracking and further hydrogenation of products, resulting in low selectivity for higher hydrocarbons. High F-T activity can be obtained over Co catalysts supported on bimodal pore-structured materials prepared by simply modifying wide pore silica with silica sol, zirconia sol, alumina sol, and so on4)~10). The high dispersion of Co and the improved diffusion of the products in the wide pores of the bimodal catalysts are probably responsible for the high activity. If the internal surface of the wide pores of an inert support is modified with alkoxide-derived catalyst, instead of silica sol, the efficiency of the alkoxide-derived catalyst will increase, resulting in greater selectivity for higher hydrocarbons as well as high and stable activity. In the present study, the surface of macro-porous silica was modified with alkoxide-derived RuSiO2 precursor, to prepare bimodal pore-structured Ru/SiO2 catalysts. 2. Experimental

Fischer-Tropsch Reaction over Bimodal Porous Ru/SiO<sub>2</sub> Catalysts Prepared by Alkoxide Method