Adsorbents for hydrogen production generally use 5A molecular sieve, silica gel, activated carbon, alumina and so on. After many times of development and improvement, screening, strength, life, dynamic adsorption of impurities, separation efficiency and other aspects of the performance of the world's advanced level, hydrogen recovery rate can reach 90%.
5A molecular sieve can adsorb any molecule smaller than the pore, commonly called calcium molecular sieve. It can adsorb C3-C4 n-alkanes, chloroethane, bromoethane, butanol and so on. It can be used in the separation of n-isomeric hydrocarbons, pressure swing adsorption separation and co-adsorption of water and carbon dioxide.