Table 3. Reusability Test of VPO/β-SiCa.
| no. of cycles | methanol conv. (%) | formaldehyde sel. (%) |
|---|---|---|
| 1 | 100 | 89.8 |
| 2 | 100 | 89.8 |
| 3 | 100 | 89.8 |
| 4 | 99 | 89.8 |
Conditions: Amount of catalyst, 0.05 g; Temp., 80 °C; time, 6 h; oxidant/TBHP and methanol/oxidant ratios, 2:1.