Y Zeolite Structure: FAU Framework
Y zeolite belongs to the FAU (faujasite) framework type, the most commercially important large-pore zeolite topology. Its defining feature is a three-dimensional network of supercages connected by 12-membered ring windows.
Pore and Cage Architecture
| Feature | Dimension |
|---|---|
| Pore openings | 7.4 A (12-MR) |
| Supercage diameter | approximately 12 A |
| Sodalite cage diameter | approximately 6.6 A |
The FAU structure is built from sodalite cages (beta-cages) connected through hexagonal prisms. Eight sodalite cages surround each supercage, creating a spacious internal volume accessible through four 12-MR windows per supercage.
Framework Composition
FAU is an aluminosilicate with the general formula (Na, H) Al Si(192-x) Al(x) O384. Natural faujasite has Si/Al of about 2.5, while synthetic Y zeolite typically ranges from 2.5 to 6. Dealumination produces USY with higher framework Si/Al.
Key Structural Features
- 3D channel system via interconnected supercages
- Largest accessible cage volume among commercial zeolites
- High ion-exchange capacity from framework Al
- Unit cell size decreases with dealumination (24.7 to 24.24 A)
See Y Properties and the Y product hub.
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