Experimental Study for Equilibrium Adsorption of Carbon Dioxide and Nitrogen on 5A and 13X Molecular Sieves

In recent years, cyclic adsorption processes with molecular sieves have emerged to be popular choices for gas separation and purification applications such as nitrogen separation from air and CO2 capturing. For the modeling of these adsorptive processes, multicomponent adsorption equilibrium data over a broad range of concentrations is highly desirable. It is preferable to estimate the multicomponent adsorption parameters on the basis of the adsorption isotherms of pure components. In this work, the equilibrium adsorption of carbon dioxide and  nitrogen on 5A and 13X zeolites were investigated by the static volumetric method. Experimental tests were performed at various temperature and pressure up to 2MPa. The results demonstrated that 13X zeolite had much higher capacity than 5A type for carbon dioxide adsorption, but 5A zeolite had a slightly higher capacity for nitrogen adsorption. Equilibrium isotherms for gases adsorption were fitted with Langmuir and Sips equations and the parameters for each model have been calculated