TABLE 3.
Surface elemental composition and chemical states of the Au/CeO2X catalysts as inferred by X-ray photoelectron spectroscopy analysis.
| Sampe | Au (at%) (wt%) | Ce (at%) | O (at%) | Olatt (%) | Odefect (%) | OOH ad (%) | Ce3+ (%) | Au0 (%) | Au+ (%) | Au3+ (%) | Aun+ (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Au/CeO2120 | 0.56 (1.88) | 32.63 | 66.81 | 58.1 | 35.9 | 6.0 | 21.8 | 50.3 | 25.2 | 24.6 | 49.7 |
| Au/CeO2140 | 0.65 (2.18) | 29.96 | 69.39 | 66.9 | 29.1 | 4.8 | 17.1 | 79.7 | 11.8 | 8.6 | 20.3 |
| Au/CeO2160 | 0.50 (1.68) | 31.07 | 68.43 | 61.4 | 34.1 | 4.5 | 15.7 | 75.1 | 14.0 | 11.0 | 24.9 |
| Au/CeO2180 | 0.66 (2.22) | 32.86 | 66.48 | 68.2 | 26.7 | 2.1 | 15.7 | 79.9 | 11.9 | 8.2 | 20.1 |