Adsorption Equilibrium and Kinetics of Nitrogen, Methane and Carbon Dioxide Gases onto ZIF-8, Cu10%/ZIF-8, and Cu30%/ZIF-8

Various ZIFs (ZIF-8, Cu-10%/ZIF-8, and Cu-30%/ZIF-8) were exploited in the adsorption of N-2, CH4, and CO2 gases over a temperature range from 25 to 55 degrees C. The dual site Langmuir model was used to describe the measured adsorption equilibria. Overall, N-2 exhibited the lowest adsorption capacity onto all adsorbents, whereas CO2 gas exhibited the highest adsorbed amount. Among the three adsorbents, the highest adsorption capacities of all gases was onto Cu-10%/ZIF-8. The adsorption isosteric heats of different systems were determined. Furthermore, the overall mass transfer coefficients for adsorbing N-2, CH4 and CO2 gases on each adsorbent were studied at different temperatures.