Abstract
Cation-free zirconosilicate zeolite CHA and thin zirconia-supported membranes were in situ synthesized in a fluoride-free gel for the first time. The usage of the ZrO2/Al2O3 composite support inhibited the transportation of aluminum from the support into zeolite membranes. No fluorite source was used for the synthesis of cation-free zeolite CHA membranes, indicating the green property of the synthesis. The thickness of the membrane was only 1.0 μm. The best cation-free zeolite CHA membrane prepared by the green in situ synthesis displayed a high CO2 permeance of 1.1 × 10-6 mol/(m2 s Pa) and CO2/CH4 selectivity of 79 at 298 K and 0.2 MPa pressure drop for an equimolar CO2/CH4 mixture.
Original language | English |
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Pages (from-to) | 16853-16864 |
Number of pages | 12 |
Journal | ACS Applied Materials and Interfaces |
Volume | 15 |
Issue number | 13 |
DOIs | |
State | Published - 5 Apr 2023 |
Keywords
- CO capture
- Si-CHA
- in situ synthesis
- natural gas sweetening
- zeolite membranes