Table 3. Product Distribution of Benzyl Alcohol Oxidation over Different Catalysts with Hydrogen and Oxygend.
| selectivity
(%) |
||||||
|---|---|---|---|---|---|---|
| catalyst | conversion (%) | toluene | benzaldehyde | benzoic acid | benzaldehyde production (mmol h–1 kgcat–1) | TOF/h–1 |
| HTS-1 | 0 | 0 | 0 | 0 | 0 | |
| Pd@HTS-1-ORO | 0 | 0 | 0 | 0 | 0 | |
| Pd/HTS-1-OR | 7.7 | 0 | 100 | 0 | 708.4 | 396.8 |
| Pd@HTS-1-OR | 46.4 | 0 | 100 | 0 | 4268.8 | 582.4 |
| Pd/Ca | 6.9 | 0 | 90.4 | 9.6 | 573.8 | |
| Pt/Ca | 12.7 | 2.1 | 72.1 | 25.8 | 842.4 | |
| Pd@HTS-1-ORb | 9.2 | 0 | 94.2 | 5.8 | 797.3 | |
| HTS-1c | 0 | 0 | 0 | 0 | 0 | |
a
Pd/C and Pt/C are commercial catalysts.
b
Reaction conditions: O2/Ar (1.1 MPa), benzyl alcohol (0.01 g), 8.5 g of solvent (2.9 g of HPLC water, 5.6 g of MeOH), 0.02 g of 0.1 wt % Pd catalyst, 50 °C, 1200 rpm, 30 min.
c
Reaction conditions: benzyl alcohol (0.01 g), 8.5 g of solvent (5.6 g of MeOH, 2.22 g of H2O, and 0.68 g of 30 wt % H2O2), 0.02 g of 0.1 wt % Pd catalyst, 50 °C, 1200 rpm, 30 min.
d
Reaction conditions: H2/Ar (2.9 MPa) and O2/Ar (1.1 MPa), benzyl alcohol (0.01 g), 8.5 g of solvent (2.9 g of HPLC water, 5.6 g of MeOH), 0.02 g of 0.1 wt % Pd catalyst, 50 °C, 1200 rpm, 30 min.