Synthesis And Characterization Of Cobalt Supported On Nano-titania For Fischer-Tropsch Synthesis

The synthesis of liquid fuel based on Fischer-Tropsch (F-T) synthesis through the coal or natural gas would have significant meaning in resolving the problems of the national energy-supply security and environment protection in China. However, how to improve the F-T reaction activity, reduce the exhaust of CO₂ and CH4 as well as energy consumption in process of F-T synthesis are urgent problems for industrialized production in the future. A key step for solving the problem is to develop the design and synthesis for the F-T synthesis catalyst with high activity and selectivity.In this paper, cobalt supported on the titania with different morphologies and phases were investigated, respectively. Detailed contents are as follows:(1): Protonated titanates nanotubes and titanates nanofibers were prepared by hydrothermal process using TiO₂ powder as raw material in NaOH solution, at different tempretures. They were characterized by TEM and XRD and so on. A series of supports with different morphologies were obatained from protonated titanates nanotubes and titanates nanofibers as precursors. The samples were prepared by impregnation of the cobalt precusor onto carriers. Based on CO hydrogenation, the samples for F-T were investigated.(2):Protonated titanate nanotubes were from inorganic titanium compounds by hydrothermal reaction. In nitric acid solution, the protonated titanate nanotubes transform to anatase and rutile nanoparticles, respectively. The properties of cobalt supported on the various anantase:rutile ratios carriers were investigated. The samples were prepared by impregnation of the cobalt precusor onto the various anantase:rutile ratios carriers. Investigated by CO hydrogenation, the cobalt oxides species dipersed on the pure rutile titania was the most active and highest selectivity among any other sample.