| 초록 |
Doping a small amount of metal atoms into host metal oxide lattice can enhance catalytic activity by changing the property of surface lattice oxygen. Here, a Pt-doped antimony-tin oxide (Pt/ATO) for CO oxidation was synthesized by incipient wetness impregnation. Pt-deposited tin oxide (Pt/TO) and silica (Pt/SiO2) were also prepared to compare the catalytic properties depending on the different surface structures. HAADF-STEM images, DRIFTS for CO chemisorption, and XPS results showed that the Pt/ATO has atomically doped Pt into the tin oxide surface. The Pt/ATO clearly exhibited the highest activity for CO oxidation. CO-TPR and O2-TPD results revealed that doping Pt atoms into the tin oxide surface leads to a better surface lattice oxygen activity, resulting in the enhancement of the catalytic performance. In-situ DRIFTS for CO oxidation showed less formation of carbonate species on the catalytic surface of the Pt/ATO, which enhanced the CO oxidation activity and durability. |
