Journal article

Anomalous Henry's law behavior of nitrogen and carbon dioxide adsorption on alkali-exchanged chabazite zeolites

Firas N Ridha, Paul A Webley

SEPARATION AND PURIFICATION TECHNOLOGY | ELSEVIER | Published : 2009

Abstract

This work presents adsorption equilibria of N2 and CO2 on a fully exchanged potassium chabazite (KCHA), sodium chabazite (NaCHA) and lithium chabazite (LiCHA) zeolites. Isotherms were measured at 273, 303 and 333 K over pressure ranges from 0.1 to 103 kPa for N2 and from 0.001 to 103 kPa for CO2, using a volumetric apparatus. In all cases, CO2 adsorption capacities were remarkably higher than those for N2 with unusual non-linear isotherm trends at pressures lower than 1.0 kPa. Accordingly, extrapolation to zero pressure for the determination of Henry's constants is problematic and could be erroneous. The maximum loadings of N2 and CO2 were obtained on LiCHA, and very low loadings of N2 on KC..

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