Table 2.
Effect of metal centers in Si@Porp. M1&M2 on inhibiting deep conversion of partial oxidation products a.
| ||||||||
|---|---|---|---|---|---|---|---|---|
| Entry | Metal Centers |
Conversion (%) |
Selectivity (%) | |||||
| C6-OOH | C6-OH | C6=O | C4-(COOH)2 | C3-(COOH)2 | Total b | |||
| 1 | / | <0.20 | N. D. c | N. D. | N. D. | N. D. | N. D. | N. D. |
| 2 | Si@NH2 | 0.47 | 84.3 | N. D. | 15.7 | N. D. | N. D. | >99 |
| 3 | Co | 2.22 | 39.9 | 25.6 | 26.1 | 6.9 | 1.5 | 91.6 |
| 4 | Cu | 0.42 | 79.5 | 0.8 | 19.7 | N. D. | N. D. | >99 |
| 5 | Zn | 0.63 | 78.1 | 1.3 | 20.6 | N. D. | N. D. | >99 |
| 6 | Co and Cu | 2.41 | 36.5 | 35.6 | 24.1 | 3.0 | 0.8 | 96.2 |
| 7 | Co and Zn | 2.31 | 43.1 | 32.7 | 19.7 | 3.9 | 0.6 | 95.5 |
| 8 | Co and Ni | 1.44 | 79.4 | 0.2 | 17.5 | 2.8 | 0.1 | 97.1 |
| 9 | Cu and Zn | 0.39 | 78.8 | N. D. | 18.6 | 2.6 | N. D. | 97.4 |
a Reaction conditions: substrate (cyclohexane, 16.8320 g, 200 mmol), O2 (1.0 MPa in constant supply), catalyst (20 mg, 0.10 mg/mmol, catalysts/substrate), stirring at speed of 600 rpm and 120 °C for 8.0 h. b Total selectivity of POX-products. c Not detected.