... years professional manufacturer for molecular sieve 3A, 4A,5A, 13X appearance:sphere /pellet ISO9001:2000 Product descriptionMolecular sieve is a material ... this case. Methods for regeneration of molecular sieves include pressure change (as in oxygen concentrators), heating and purging with ... purification of air, natural gas and oil, in oxygen making and hydrogen making by PAS processes5A-DW0.45- ...