Thermodynamics Modeling of Binary GasAdsorption Equilibria for CO2, CH4, CO and N2 overCarbon Nanotubes

Due to importance of gas adsorption process in diverse fields of scienceand necessity of applying carbon nanotubes in chemical processes,thermodynamics modeling of binary gas adsorption equilibria for CO2,CH4, CO and N2 over some typical carbon nanotubes is investigated.Hence, pure adsorption isotherms of CO2, CH4, CO and N2 on varioustypes of carbon nano tubes were selected from literature data and theirbinary adsorption is predicted using Sips isotherm model combining idealadsorbed solution model. Furthermore, isosteric heats of adsorption arepredicted using an equation derived from Sips model. Binary adsorption ofthe studied systems is characterized using equilibrium x-y diagrams andselectivity curves. Finally effect of temperature and pressure on theselectivity of the considered systems is discussed. The obtained resultsshow that, carbon nanotubes could be applied as a selective adsorbent toseparate all the investigated systems.

Keywords:

Gas Adsorption , Carbon Nano Tubes , Ideal Adsorbed Solution Model