Fe-ZSM-5 Zeolite Catalyst
Fe-ZSM-5 is the iron-exchanged form of the ZSM-5 zeolite (MFI framework). Iron sites give the material exceptional activity for nitrous oxide (N₂O) decomposition, high-temperature SCR of NOx, and selective oxidation reactions. Fe-ZSM-5 combines the shape selectivity and hydrothermal stability of the MFI framework with redox chemistry that no aluminosilicate provides in its parent form.
What is Fe-ZSM-5?
Fe-ZSM-5 is produced by iron exchange of ZSM-5. Iron occupies exchange sites and, depending on preparation, forms small oxide clusters that are the active centres for N₂O decomposition and high-temperature DeNOx. The preparation route (ion exchange vs impregnation, calcination conditions) strongly affects the iron speciation and therefore the catalytic behaviour.
Key Applications
| Application | Function | Notes |
|---|---|---|
| N₂O decomposition | 2 N₂O → 2 N₂ + O₂ | Greenhouse gas abatement in nitric acid plants |
| High-temperature SCR | NOx reduction with NH₃ | Active at 350-600 °C |
| Selective oxidation | Benzene to phenol (N₂O route) | Classic Fe-ZSM-5 chemistry |
| HC-SCR | NOx reduction with hydrocarbons | Research and specialty duty |
Fe-ZSM-5 vs Cu-ZSM-5
| Property | Fe-ZSM-5 | Cu-ZSM-5 |
|---|---|---|
| Best temperature window | 350-600 °C | 200-500 °C |
| N₂O decomposition | Excellent | Moderate |
| SO₂ tolerance | Superior | Moderate |
| Hydrothermal stability | Very good | Good to ~650 °C |
| Low-temperature activity | Lower | Higher |
Available Grades
| Grade | SiO₂/Al₂O₃ | Fe Loading | Application |
|---|---|---|---|
| Fe-ZSM-5-25 | 25 | 1-3 wt% | N₂O decomposition, high-temp SCR |
| Fe-ZSM-5-50 | 50 | 1-2 wt% | Balanced activity and stability |
| Fe-ZSM-5-100 | 100 | 0.5-1.5 wt% | High-temperature duty, hydrophobic service |
Precursor H-, NH₄-, and Na-form ZSM-5 is available for customers performing their own iron exchange — see the ZSM-5 product hub. When requesting a sample, specify your target reaction, operating temperature, and desired Fe loading and Si/Al ratio.
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