| 초록 |
Pore size-controlled ordered mesoporous alumina (OMA)-supported cobalt catalysts were used for Fischer-Tropsch synthesis. Alumina materials have been widely used as a support for Fischer-Tropsch catalysts. However, there are a few demerits such as sintering and irregular metal particle size due to broad pore size distribution. To enhance those kinds of catalysts, we suggested a physical confinement of metal nanocrystals inside size-controlled pores of alumina support. The pore size was controlled by incorporating chemical agents. Cobalt nanoparticles of a predetermined size were separately prepared and deposited inside the pores of OMA. By doing so, the degree of confinement could be quantitatively evaluated. We investigated the effects of size difference between pore and metal nanocrystal on catalytic performance. Physisorption method was used to determine specific surface area, pore size and structure. X-ray diffraction method was used to analyze the structure of OMA, the oxidation states of metal nanoparticles, and the metal crystal size which was also verified by TEM images. On-line gas chromatography was used for analyzing product compositions. |
