Beta Zeolite Structure: BEA Framework
Beta zeolite catalyst belongs to the BEA framework type, the first high-silica zeolite synthesized with 12-membered ring pores. Its three-dimensional channel system provides excellent molecular accessibility, making it a supplier-grade catalyst option for bulky-feed acid catalysis.
Channel System
| Channel Direction | Ring Size | Dimensions |
|---|---|---|
| [100] | 12-MR | 6.6 x 6.7 A |
| [001] | 12-MR | 5.6 x 5.6 A |
All three crystallographic directions have 12-MR pores, creating a fully interconnected 3D network. This distinguishes Beta from FAU (which has cages) and MFI (which has 10-MR pores).
Framework Composition
BEA is an aluminosilicate, typically synthesised with Si/Al ratios from 10 to over 100. The framework is actually an intergrowth of two polymorphs (A and B), both built from the same building units but stacked differently. This intergrowth creates some structural disorder but does not significantly affect catalytic performance.
Key Structural Features
- Fully 3D 12-MR channel system
- No cages — all pore space is channel-connected
- High external surface area supports good accessibility
- Tetragonal crystal system
See Beta Properties and the Beta product hub.
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