It is a kind of a synthetic zeolite with a 4 angstrom pore size. It is able to adsorb molecules with critical diameters which are not more than 4A, such as water, NH3, H2S, sulfur dioxide, carbon dioxide, C2H5OH, C2H6, C2H4. Thus, it is always used as the molecular sieve as well as the desiccant....
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