Thermodynamics Modeling of Binary Gas Adsorption Equilibria for CO2, CH4, CO and N2 over Carbon Nanotubes

Due to importance of gas adsorption process in diverse fields of science and 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 various types of carbon nano tubes were selected from literature data and their binary adsorption is predicted using Sips isotherm model combining ideal adsorbed solution model. Furthermore, isosteric heats of adsorption are predicted using an equation derived from Sips model. Binary adsorption of the studied systems is characterized using equilibrium x-y diagrams and selectivity curves. Finally effect of temperature and pressure on the selectivity of the considered systems is discussed. The obtained results show that, carbon nanotubes could be applied as a selective adsorbent to separate all the investigated systems.