<span style="font-size:11.0pt;mso-bidi-font-size: 10.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Adsorption selectivity of CO₂ over N₂ by cation exchanged zeolite L: Experimental and simulation studies</span>

Abstract

CO₂ and N₂ adsorptions of alkali and alkaline earth metal cation exchanged zeolite L have been investigated by volumetric measurements and Grand Canonical Monte Carlo simulation. The zeolite KL shows lower degree of exchange because of its unique open-channel framework, linked cancrinite and intercage sites. Structural characteristics have been evaluated using X-ray diffraction analysis and surface area measurements. CO₂ and N₂ adsorption isotherms have been obtained for zeolite KL and its cation exchanged form up to 101.3 kPa at 293 and 303 K and the corresponding heats of adsorption estimated by the Clausius-Clapeyron equation. The experimental results are compared with those obtained from GCMC simulation. The texture of the materials and their selectivity for CO₂ over N₂ adsorption varies with the nature of the exchanged cations. Zeolite-CaL shows remarkably high CO₂ selectivity (31 times) over N₂amongst the studied alkali and alkaline cation exchanged zeolite L. It has been shown that zeolite L can be used as a potential adsorbent for the removal of CO₂ from industrial effluent gases.