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, CH 4, and CO 2 gases over a temperature range from 25 to 55 °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 CO 2 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, CH 4 and CO 2 gases on each adsorbent were studied at different temperatures.