| 초록 |
Loss of metal dispersion by thermal sintering is a significant problem in metal catalysts supported on porous solids particularly for high-temperature reactions. In the present work, we show that a mesoporous zeolite can be used as a metal catalyst support resulting in high metal dispersion and thermal stability. Thermal treatment tests over 300 ~ 900 ºC revealed that the mesoporous zeolite could effectively stabilize 1 wt% Pt in a form of tiny nanoparticles with diameters less than 3 nm, whereas other porous solids such as γ-alumina and MCM-48 showed severe thermal sintering. Moreover, the mesopores in zeolite were very efficient to confine light metals (e.g., Ni and Co) as a nanoparticle, which easily undergo thermal sintering due to the low polarizability. Therefore, the mesoporous zeolite support could show high catalytic performance in various reactions, such as hydroisomerization of n-dodecane, propane dehydrogenation and FT-synthesis reactions. |
