Beta Zeolite Pore Size
Beta zeolite has the BEA framework topology, a large-pore zeolite with a three-dimensional channel system built from 12-membered rings.
Channel Dimensions
Beta zeolite contains two types of intersecting channels:
| Channel Type | Dimensions | Direction |
|---|---|---|
| 12-MR straight channel | 6.6 × 6.7 A | a-axis |
| 12-MR sinusoidal channel | 5.6 × 5.6 A | b-axis |
The 12-MR openings have a free diameter of approximately 6.6 A, allowing molecules up to about 7-8 A in kinetic diameter to enter the pore system. This includes:
- Substituted monoaromatics (xylenes, ethylbenzene, cumene)
- Polycyclic aromatics (naphthalene, methylnaphthalene)
- Branched paraffins and olefins
- Cyclic hydrocarbons
- Bulky oxygenates
Comparison with Other Zeolites
| Zeolite | Framework | Pore System | Approx. Pore Size |
|---|---|---|---|
| Beta | BEA | 12-MR 3D | 6.6 × 6.7 A |
| Y / USY | FAU | 12-MR 3D (cage) | 7.4 A (window) |
| ZSM-5 | MFI | 10-MR 3D | 5.1-5.6 A |
| SAPO-34 / SSZ-13 | CHA | 8-MR 3D (cage) | 3.8 A (window) |
Beta sits between Y zeolite and ZSM-5 in terms of pore size. Its 3D connectivity is a key advantage over one-dimensional large-pore zeolites — molecules that cannot enter one channel can often access the pore system through an intersecting channel.
Accessibility and Diffusion
Unlike FAU-type zeolites where molecules must pass through 12-MR windows into and out of ~12 A supercages, Beta’s 3D channel system provides continuous pore pathways without cage constriction. This makes Beta particularly effective for reactions where diffusion of bulky intermediates or products is rate-limiting.
For detailed specifications, see the Beta Zeolite specifications page. Request a sample for custom particle sizes.
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