Mx / m [(AlO2) x (SiO2) y] zH2O. M represents a cation, m represents the number of valence, z is a hydration number, x and y are integers. After the activation of zeolite, water molecules are removed, and the remaining atoms to form a cage-like structure, a pore diameter of 3 ~ 10Å.5a zeolite molecular sieves crystals have a number of holes with a diameter (also called "windows") are connected between the plurality of holes of a certain size, a hole. Due to its pore molecular sieve adsorption ratio can small molecules to the internal cavity, and the pore size larger than the hole in its rejection of foreign molecules, molecules play a role in screening, so named sieve.
13x zeolite molecular sieves pores or channels in their system can be divided into the hole, the hole (mesoporous) and holes zeolite three groups.
PSA oxygen-enriched air can be used for adsorption separation.
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