| 초록 |
This study was devoted to measure O coverages, established by N2O decomposition, using the volumetric high vacuum system and to compare them with those obtained by the chemisorption of O2, H2, and CO. N2O decomposes on Pt surfaces at 363 K and 76 Torr, thereby forming a monolayer of chemisorbed oxygen. The monolayer coverage on a 0.78% Pt/SiO2 catalyst was the same as that established by hydrogen adsorption. These “O” atoms were completely removed by H2 titration at 300 K. After O coverages were established by N2O decomposition at 363 K, exposure of these Pt surfaces to CO at 300 K removed the oxygen via CO2 formation. These titration techniques are anticipated to be a useful approach to individualize surface atoms in supported Cu-based bimetallic Pt systems. |
