Molecular sieve is a material of crystalline metal aluminosilicates which having interconnecting network of zeolite and alumina tetrahedra.Molecular sieve are used as a desiccant and adsorbents. It is very small pores, while allowing small pores to pass; it is efficient to block large molecules. That becomes powerful adsorbents with having the strong adsorption capacity with water, oxygen, carbon dioxide and other molecules less than its pore size.

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