| 초록 |
The manipulation of the interaction between Pd metal and supports are effective at enhancing metal dispersion, which mainly affects the Pd surface area and modifying the structure of supports. In our previous study1, Pd/TiO2 catalyst was prepared by a sonochemical method to increase dispersion of Pd on TiO2 support. As a result, sono-chemically prepared Pd/TiO2 catalyst was achieved the highest H2O2 production rate (729 mmol/gPd*h) than among tested catalysts (incipient-wetness prepared Pd/TiO2, sonochemically prepared Pd/SiO2, incipient-wetness prepared Pd/SiO2) due to increase dispersion of Pd active sites. According to previous study, Pd/TiO2 and sodium (Na) doped Pd/TiO2 catalysts were applied on oxidation of formaldehyde reaction. As a result, Pd0.67Na/TiO2 catalyst was much higher catalytic activity than that of pure Pd/TiO2 catalyst due to high dispersion of Pd by Na promotion. Na promoted Pd/TiO2 had smaller Pd particle size and dispersion increased about 3.4 times than pure Pd/TiO2 catalyst. Therefore, Pd dispersion effect by Na promoted synergistic effect was strongly affected on this catalytic activity. |
