molecular sieve
The 3A molecular sieve is a synthetic zeolite with a uniform pore structure (3Å diameter), enabling selective adsorption based on molecular size and polarity.
Key Mechanisms:
- Size-Selective Adsorption: The 3Å pores allow only molecules smaller than 3Å (e.g., H₂O, 2.6Å) to enter, while excluding larger molecules (e.g., NH₃, CO₂, hydrocarbons).
- Ion-Exchange Modification: Derived from 4A molecular sieve (Na⁺ form), 3A is produced by replacing Na⁺ with larger K⁺ ions, reducing the effective pore size from 4Å to 3Å.
- High Affinity for Water: The negatively charged aluminosilicate framework and K⁺ cations create strong electrostatic interactions with polar H₂O molecules, ensuring efficient adsorption.
3A Molecular Sieve
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