... properties; used widely in industry 1. Performance characteristics:4A molecular sieve's aperture is 4A,it adsorbs water, methanol, ... carbon dioxide, ethylene, propylene, and does not adsorb any molecular larger than 4A(including propane), the choice to water adsorption ... is one of the largest varieties of molecular sieve in industry use. 2. Molecular formula: Na2O· Al2O3 ·2.0SiO2 ·4.5H2O3. Technical ...