Research Article
Photooxidation of Toluene: Correlation of Noble Metal Loading on Titania and Activation Energy
Table 2
Surface characteristics of Pt/TiO2 and Pd/TiO2 used for the photocatalytic oxidation of toluene.
| | Catalyst | Surface area
(m2 g−1) | Pt or Pd loading (wt%) | Pt or Pd dispersion (%) | | Expected | Determined |
| | TiO2 | 55.3 | — | — | — |
| | 0.1% Pt/TiO2 | 41.7 | 0.1 | 0.102 | 35.8 | | 0.1% Pd/TiO2 | 51.9 | 0.1 | 0.112 | 36.3 |
| | 0.5% Pt/TiO2 | 35.6 | 0.5 | 0.51 | 30.4 | | 0.5% Pd/TiO2 | 49.5 | 0.5 | 0.53 | 30.9 |
| | 0.7% Pt/TiO2 | 31.9 | 0.7 | 0.73 | 25.9 | | 0.7% Pd/TiO2 | 47.1 | 0.7 | 0.76 | 25.1 |
| | 1% Pt/TiO2 | 29.2 | 1 | 1.05 | 22.6 | | 1% Pd/TiO2 | 41.7 | 1 | 1.25 | 21.1 |
| | 1.2% Pt/TiO2 | 26.4 | 1.2 | 1.21 | 17.5 | | 1.2% Pd/TiO2 | 39.3 | 1.2 | 1.32 | 18.2 |
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Platinum or palladium dispersion was determined on the basis of chemisorption of platinum or palladium/CO=1.
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