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A higher selectivity to C 2 À C 4 hydrocarbons and clean fuels without significant deactivation during CO hydrogenation by a typical Fischer-Tropsch synthesis (FTS) was observed on the ordered mesoporous 5wt %Al-modified Co 3 O 4 -Fe 2 O 3 bimetal oxides (m-CoFe) at a Co/Fe molar ratio of~1, which was prepared by a hard templating and co-infiltration method. The active sites were related with the partially oxidized Co nanoparticles as well as iron carbides. The structurally stable and strongly interacted ordered Co 3 O 4 -Fe 2 O 3 mesoporous structures were preferentially transformed to more brittle iron carbides with a simultaneous reduction of Co 3 O 4 to metallic Co under a reductive FTS reaction condition. The m-CoFe(1) itself without using any solid acid component revealed a higher C 2 À C 4 selectivity of 21.1 % and C 5 + selectivity of 67.9 % at CO conversion of 88.5 % with the corresponding rate of 2.77 mmol/ (g cat ·s) by enhancing its structural stability due to the partial formations of thermally stable spinel-type CoFe 2 O 4 . The enhanced structural stability of the m-CoFe(1) was attributed to the preferential formations of the strongly interacted and partially oxidized Co nanoparticles with the formation of active iron carbides as well.[a] Dr.

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