(381aa) Determination of Binary CO2/H2 Adsorption Isotherms and Kinetics over Porous Organic Cage CC3 Via Zero Length-Column Technique

Understanding the dynamics of mixed-gas adsorption is essential for industrial separation using physical adsorbents. It is important to obtain binary adsorption isotherms to gain a better understanding of the gas interactions and material interaction in multicomponent gas mixtures. Porous organic cages (POCs) are highly porous, crystalline materials, with a small average pore window that makes them promising candidates for separation applications. In this work, we utilized Zero-Length Column (ZLC) technique to determine not only the kinetics of CO₂/H₂ separation over CC3 but also the binary adsorption isotherms. The ultra-crystalline diffusivities of 1.49×10^-4 and 8.31×10^-5 were estimated from the ZLC profiles for unary CO₂ and H₂ gases at 293 K, respectively, whereas in binary CO₂/H₂ mixture, these diffusion values were reduced by 18 and 19 times, respectively. Moreover, the results indicated that the content of gases adsorbed in binary gas mixture were approximately diminished by 5- and 2-fold for CO₂ and H₂, respectively. The findings of this investigation highlight the importance of the ZLC technique in giving insight about gas interactions without using large amounts of material and or tedious experiments.