Table 4.
Synthesis parameters of high-silica CHA zeolites by interzeolite transformation in fluoride media and some product properties.
| Sample no. | Synthesis conditions | Product | ||||
|---|---|---|---|---|---|---|
| Si, Al source | Si/Al | H2O/SiO2 | Phase | Si/Al | V mic (cm3/g) | |
| 23 | CBV500 | 2.5 | 3 | FAU | — | — |
| 24 | CBV712 | 6.0 | 3 | CHA + FAU | — | — |
| 25∗ | CBV720 | 15.0 | 3 | CHA | 14.7 | 0.26 |
| 26 | CBV720 + CBV760 | 22.0 | 3 | CHA | 21.1 | — |
| 27∗ | CBV760 | 30.0 | 3 | CHA | 28.1 | 0.27 |
| 29 | HUA385 | 50.0 | 3 | CHA | 45.3 | — |
| 30 | HUA390 | 150.0 | 3 | CHA | 136.9 | 0.27 |
| 31 | HUA390 | 150.0 | 10 | STT + CHA | — | — |
| 32 | HUA390 | 150.0 | 15 | STT | — | 0.20 |
∗DMECHA was also used in addition to TMAda, and the rest of the CHA samples were prepared using TMAda as the OSDA.