Molecular Sieve
We are a manufacturer based in China. We specialize in providing high-quality Molecular Sieve for industrial clients across various sectors. Whether you need chemicals consultation or technical support, our team is here to help.
Category：Chemical Additives Own Brand：MT /MOQ:100KG /From China/ B2B only.
Introduction
Properties and Applications
1. Definition & Structure
- Molecular sieves are porous materials with uniform pore sizes, typically composed of aluminosilicates (e.g., zeolites).
- They selectively adsorb small molecules while excluding larger ones based on size exclusion.
2. Key Characteristics
| Property | Description |
|---|---|
| Pore Size Uniformity | Precise pore diameters (e.g., 3Å, 4Å, 5Å, 10Å) for selective adsorption. |
| High Surface Area | Provides extensive adsorption capacity. |
| Thermal Stability | Stable at high temperatures (up to 600–700°C). |
| Hydrophilicity | Strong affinity for water (used as desiccants). |
3. Applications
- Separation & Purification
- Gas/Liquid Separation:
- Removal of H₂O (drying), CO₂, H₂S, and other impurities from natural gas, air, and solvents.
- Separation of isomers (e.g., p-xylene from o– and m-xylene).
- Oxygen Concentrators: Nitrogen removal from air (e.g., LiX zeolite).
- Gas/Liquid Separation:
- Catalysis
- Catalyst Support: Enhances dispersion of active metals (e.g., Pt, Pd).
- Acidic/Basic Catalysis: Zeolites (e.g., ZSM-5, Y-type) for cracking, alkylation, and isomerization.
- Industrial Uses
- Drying Agents: Packed in desiccant columns for solvents and refrigerants.
- Petrochemicals: FCC (Fluid Catalytic Cracking) catalysts in oil refining.
4. Common Types
| Type | Pore Size (Å) | Key Applications |
|---|---|---|
| 3A | 3 | Drying polar liquids (ethanol, methanol). |
| 4A | 4 | Air drying, CO₂ removal. |
| 5A | 5 | N₂/O₂ separation, petroleum refining. |
| 13X | 10 | CO₂ removal, gas purification. |
5. Regeneration & Reusability
- Thermal Regeneration: Heating at 250–350°C under vacuum or inert gas to remove adsorbed molecules.
- Pressure Swing Adsorption (PSA): Cyclic adsorption-desorption for continuous processes.
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