Zeolite knowledge: the advantages and characteristics of molecular sieve

Advantages of molecular sieves
According to the size and shape of the molecule adsorption of different choices, that is, only those molecules smaller than the molecular sieve adsorption pore. 
For small polar molecules and unsaturated molecules having selective adsorption properties, the greater the polarity, the higher the degree of unsaturation, the stronger its selective adsorption. 
With a strong water absorption. Even higher at lower temperatures, a larger space velocity and water content, there is rather high water absorption capacity.

Characteristics of molecular sieves
Molecular sieve oxysiv are crystalline aluminosilicate artificial, based on the size of the internal cavities of the crystal and molecular adsorption or exclusion of different substances, which is aptly called "molecular sieves." It consists of AlO4 and SiO4 tetrahedra composition, in a molecular sieve crystal lattice, metal cations from the balance AlO4 tetrahedra excess negative charge effect. Molecular diameter less than the diameter of the pore molecular sieve crystals can enter the zeolite crystal material, which can be adsorbed, otherwise excluded. Molecular sieves and according to different polar or polarizable substances preferentially adsorbed order. Usually strong polarity molecules are readily adsorbed.
Good thermal stability of molecular sieves, capable of withstanding 600 ° C -700 ° C High Temperature, molecular sieves do not melt in water, but soluble in acid and alkali, it can be in PH5-11 medium, in the salt solution can be exchanged other cations.