Zeolite molecular sieve

Zeolite molecular sieve is a hydrate of crystalline aluminosilicate metal salt, and its general chemical formula is: Mx/m[(AlO₂)x·(SiO₂)y]·zH₂O. M represents a cation, m represents its valence number, z represents the hydration number, and x and y are integers. After the zeolite molecular sieve is activated, the water molecules are removed, and the remaining atoms form a cage structure with a pore size of 3-10Å. There are many holes of a certain size in the molecular sieve crystal, and many holes (also called "windows") of the same diameter are connected between the holes. Molecular sieves are named molecular sieves because they can absorb molecules smaller than their pores into the cavities, while repelling molecules larger than their pores out of the cavities, and play a role in sieving molecules. Zeolite molecular sieves can exist in nature, and artificial large-scale synthesis began in the 1970s.