activated molecular sieves Structure

Zeolitic molecular sieves known as synthetic zeolites or molecular sieves having a chemical composition formula is:
[M2 (Ⅰ) M (Ⅱ)] O.Al2O3.nSiO2. MH2O
Formula M2 (Ⅰ) and M (Ⅱ) respectively monovalent and divalent metal ions, most of the sodium and calcium, n is called silica to alumina ratio of the zeolite, sodium silicate and silicon mainly from silica, aluminum comes from sodium aluminum and Al (HO) 3, etc., which react with aqueous sodium hydroxide colloid was prepared and dried after a zeolite, activated alumina typically n = 2 ~ 10, m = 0 ~ 9.
Characteristics of the zeolite molecular sieve having a role, it has a uniform pore size, such as 3A0,4A0,5A0,10A0 pores. There 4A0 4A0 pore zeolite adsorption of methane, ethane, and not more than three carbon adsorption of n-alkanes. It has been widely used for activated alumina drying agent  gas adsorption separation, drying, and gas and liquid separation are different alkanes.
Thus proteoglycan aggregates composed of coiled turns, forming a sieve-like microporous structure, called molecular sieves. Zeolite molecular sieve allowing only its micro-pores is less than the material through its pores large macromolecules, the bacteria has a barrier function.