13X molecular sieve is an alkali metal aluminosilicate with a pore size of 10 angstroms (1 nanometer), and it is a sodium ion X-type molecular sieve. Due to its internal structure containing numerous 10-angstrom crystal adsorption cavities, it can adsorb molecules with a diameter smaller than 10 angstroms while not adsorbing any molecules with a diameter greater than 10 angstroms. It can be used as a catalyst support, for co-adsorption of water and carbon dioxide, and for co-adsorption of water and hydrogen sulfide gases. It is mainly applied in the drying of pharmaceuticals and air compression systems, offering higher adsorption capacity and lower dew points.