| 초록 |
Metal-support interactions in platinum group metals supported metal oxide catalysts have a significant effect on catalytic properties. In the present research, CO chemisorption analysis with different reducive treatment demonstrated that the strong metal-support interaction (SMSI) phenomenon, covering of Pt by TiO2 support under the reducing conditions, can be suppressed in Pt/sulfated TiO2 (S-TiO2). XRD and XANES studies show that Pt species interact more strongly with sulfur-free TiO2 surface, thereby facilitating SMSI phenomena at the lower temperature. Weakened interaction between Pt and S-TiO2 led to the formation of large Pt clusters with more metallic character. In CO oxidation, temperature of 50% conversion (T50) was lower on Pt/S-TiO2 than on Pt/TiO2 by more than 50 oC. It can be suggested that the metal-support interaction between Pt and TiO2 could be controlled by S species, which can have a great advantage in CO oxidation ability. |
