Mordenite Properties
Mordenite’s most important commercial property is the combination of a 12-membered ring main channel and strong acid-site potential after conversion to H-form.
Key Physical Properties
| Property | Typical Value |
|---|---|
| Framework type | MOR |
| Main channel | 12-MR, approx. 6.5 x 7.0 A |
| Side pockets | 8-MR channels and pockets |
| Channel dimensionality | Primarily one-dimensional |
| BET surface area | 350-500 m2/g |
| Typical SAR range | 10-45+ |
| Cation forms | Na-form, NH4-form, H-form |
Acidity Profile
H-Mordenite has strong Brønsted acidity generated by framework aluminum sites after proton exchange. Lower SiO2/Al2O3 ratios provide more acid sites and higher activity; higher ratios reduce acid density and increase hydrophobicity.
This acidity can be useful in alkylation, dehydration, isomerization screening, and selected hydrocarbon conversion systems. The trade-off is diffusion: because MOR is mainly one-dimensional, coke formation or pore-mouth blockage may be more limiting than in 3D frameworks such as Beta zeolite.
Selection Notes
- Choose lower SAR when maximum acid-site density is required.
- Choose medium SAR for balanced acidity and diffusion behavior.
- Choose higher SAR when lower acidity or higher hydrophobicity is preferred.
- Specify sodium limit carefully if the material will be used as an acid catalyst.
For procurement ranges, see Mordenite specifications.
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