Zeolite structure unit

There is a three-dimensional molecular sieve between four TO4 tetrahedra sharing vertices formed by connecting the skeleton. T backbone atoms generally refers to Si, Al or P atom, in a few cases refer to other atoms, such as B, Ga, etc. These [SiO4], [AlO4] or [PO4] tetrahedral, etc. constitute the basic skeleton of the molecular sieve adsorber unit, i.e. the primary structural unit. In the 3a zeolite molecular sieve, each T atom is coordinated with four oxygen atoms, each oxygen atom bridging two T atoms, and therefore, the [SiO4] and [AlO4] tetrahedral aluminosilicate molecular sieve xh-5 has formed anion skeleton structure, framework negative charge by the additional cation balance. Aluminosilicate zeolite chemical formula: Ax / n (SiO2) (AlO2) xmH2O (A is a cation of valence n), and adsorbed water located in the pores of the cation.