Table 6. Catalytic Testing Results for PAA-Stabilized AuPd/C Catalysts toward the Direct Synthesis of Hydrogen Peroxide and Its Subsequent Degradation.
| catalyst | actual metal loading (wt %) | H2O2 productivitya (molH2O2 mmol–1metal h–1) | H2O2 degradationb (molH2O2 mmol–1metal h–1) | H2O2 selectivity (%) |
|---|---|---|---|---|
| 1%AuPd/GNP | 0.5 | 1.9 | 1.7 | 14 |
| 1%AuPd/GNP-H+ | 1 | 2.8 | 6.4 | 38 |
| 0.5%AuPd/GNP-H+ | 0.5 | 2.6 | 6.1 | 35 |
| 1%AuPd/KBB | 0.2 | 1.2 | 3.3 | 2 |
| 1%AuPd/KBB-H+ | 1 | 1.9 | 7.3 | 25 |
| 0.2%AuPd/KBB-H+ | 0.2 | 1.8 | 7.0 | 25 |
a
H2O2 direct synthesis reaction conditions: catalyst (0.01 g), H2O (2.9 g), MeOH (5.6 g), 5%H2/CO2 (2.9 MPa), 25%O2/CO2 (1.2 MPa), 0.5 h, 2 °C, 1200 rpm.
b
H2O2 degradation reaction conditions: catalyst (0.01 g), H2O2 (50 wt % 0.68 g), H2O (2.22 g), MeOH (5.6 g), 5% H2/CO2 (2.9 MPa), 0.5 h, 2 °C, 1200 rpm.