Molecular sieve is a material of crystalline metal aluminosilicates that having an interconnecting network of zeolite and alumina tetrahedral. Molecular sieve is 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. All molecular sieves are available in beaded, pelleted and powdered form. The molecules comprise three-dimensional porous materials: microporous(including zeolite, clay and activated carbon), macroporous (including silica gel and zeolite) and mesoporous(including silicon dioxide).
