Description
There is a natural aluminosilicate in nature with effects of molecular sieving, adsorption, ion exchange and catalysis. This natural substance is called zeolite with the synthetic zeolite also known as molecular sieves.
Zeolite chemical composition formula: (Mn+) 2/nO • Al2O3 • xSiO2 • pH2O, M represents a metal ion (usually Na in the artificial synthesis), N represents a metal ion valence, x represents the number of moles of SiO2, also known as silica to alumina ratio, p represents the number of moles of water. The most basic structure of the crystalline zeolite backbone is the tetrahedra SiO4 and AlO4, through the binding of common oxygen atoms to form crystals with three-dimensional network structure. This combination forms, constitutes cavities and channels of molecular level and uniform pore size. Owing to the different structures and different forms, “cage” shaped holes can be divided intoα, β, γ, hexagonal prism and faujasite.