Table 1.
Synthesis parameters of high-silica CHA zeolites using faujasites as Al sources and some product properties.
| Sample no. | Synthesis conditions | Product | |||
|---|---|---|---|---|---|
| Al source | Si/Al faujasite | Phase | Si/Al | V mic (cm3/g) | |
| 1 | CBV100 | 2.5 | CHA | 5.2 | — |
| 2∗ | CBV500 | 2.5 | CHA | 5.9 | 0.26 |
| 3∗ | CBV712 | 6.0 | CHA | 10.8 | 0.27 |
| 4∗ | CBV720 | 15.0 | CHA | 14.7 | 0.27 |
| 5 | CBV760 | 30.0 | Amor | — | — |
| 6 | 320NAA | 2.7 | CHA | 6.1 | — |
| 7 | 341NHA | 3.5 | CHA | 8.6 | — |
| 8 | 350HUA | 5.0 | CHA | 11.4 | 0.27 |
| 9 | 360HUA | 7.5 | CHA | 12.1 | — |
Gel compositions: 26 H2O : 0.27 Na2O : 1 SiO2 : x Al2O3 : 0.14 DMECHA-OH. ∗TMAdaOH was also used in addition to DMECHA. Amor: amorphous phase. —: did not measure.