Adsorption and Diffusion of Gases In Mof-5, Mof-177 and Zeolite 5A

A comparative study was carried out to evaluate adsorption properties of two metal organic framework adsorbents (MOF-5 and MOF-177) and a conventional zeolite adsorbent (5A) for hydrogen purification and other gas separation processes. Three different greenhouse gases, carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) and three other potential trace components in hydrogen, carbon monoxide (CO), hydrogen sulfide (H2S) and ammonia (NH3) are selected to investigate both adsorption equilibrium and kinetics these adsorbents. The adsorption equilibrium and kinetic data were measured in a volumetric unit at various temperatures. It is observed that zeolite 5A has a much higher CO2 capacity than MOF-5 and MOF-177 at ambient conditions. The three adsorbents have a similar adsorption capacity for other gases. However, MOF-5 and MOF-177 have much faster adsorption kinetics. Diffusion time constants and isosteric heat of adsorption will also be reported.