the definition of Molecular sieve

Magnitude, it only allows a diameter smaller than the diameter of the molecules into, so molecular sieve zeolite in the mixture can be screened by size.It is called molecular sieve.Back more than 200 years ago, b.Kelongshitaite first named aluminosilicate zeolites, chemistry formula for m and n are metal ions and Valence;Number of molecule x is silicon dioxide;Y is the number of water molecules;P is the atomic number of aluminum;Q is the number of silicon atoms.molecular sieve dehydration process in the chemical industry as a solid adsorbent material desorption of adsorbed by the molecular sieve can be recycled after use.Also used for gas and liquid drying, purification, separation and recycling.Starting in the 1960 of the 20th century, used as a catalyst in the petroleum refining industry, has now developed a variety suitable for different molecular sieve catalysts for catalytic processes.