Molecular sieve

Molecular Sieve High Voltage (typically 0.3~2.0 Nm) system of pores and cavities, which has the characteristics of screening molecules.However with molecular screen synthesis and application research of in-depth, researchers found has p aluminum acid salts molecular sieve dehydration process screen, and molecular screen of skeleton elements (Silicon or aluminum or p) also can by b, and Ga, and Fe, and Cr, and Ge, and Ti, and v, and Mn, and Co, and Zn, and Be and Cu, replaced, its channel and empty cavity of size also can reached 2 nm above, so molecular screen by skeleton elements composition can is divided into Silicon aluminum class molecular screen, and p aluminum class molecular screen and skeleton miscellaneous Atomic molecular screen;Divided by the pore size, pore size less than 2 NM, 2~50 nm and greater than 50 nm of molecular sieves are called micro-porous, mesoporous molecular sieves.Due to its large aperture, become good carriers for large molecular reactions, but wall thickness of mesoporous material is amorphous, its thermal stability and thermal stability are not meet the demanding conditions required petrochemical applications.