MOLECULAR  SIEVE DESCRIPTION

 The zeolite molecular sieve is the hydrate of crystalline aluminum silicate metal salt. There are many holes of certain size inside the crystal, and the holes are connected by holes of the same diameter (also known as "window"). Because the molecular sieve can adsorb molecules smaller than its pore size, and exclude the molecules larger than its hole, so that it can play the role of sieve molecules, so it is named molecular sieve. The general formula of its chemical composition is: (M)2 /nO·Al2O3·xSiO2·pH 2O, M represents metal ions (usually Na when synthesized), n represents the valence of metal ions, x represents the mole of SiO 2, also known as silicon-aluminum ratio, and p represents the mole of water. The most basic structure of the molecular sieve skeleton is the SiO4 and AlO4 tetrahedron, which forms the crystallization of a three-dimensional network through the binding of common oxygen atoms.The combined form constitutes a hole and pore path with molecular size and uniform pore diameter.

Zeolite molecular sieves are widely used and play a crucial role in many fields, such as petrochemicals, fine chemicals, gas adsorption & separation, and catalysis, owing to their structural diversity, excellent hydrothermal stability, and unique selectivity.