FT-IR spectroscopic and thermodynamic study on the adsorption of carbon dioxide and dinitrogen in the alkaline zeolite K-L

The thermodynamics of carbon dioxide and dinitrogen adsorption on the zeolite K-L was investigated by means of variable temperature IR spectroscopy, a technique that affords determination of standard adsorption enthalpy (Delta H degrees) and entropy (Delta S degrees) from analysis of IR spectra recorded over a temperature range while simultaneously measuring equilibrium pressure inside a closed IR cell. Delta H degrees resulted to be -42.5 and -20.6 kJ mol(-1) for CO2 and N-2, respectively. Corresponding values of Delta S degrees were found to be -182 and -151 J mol(-1) K-1. The obtained adsorption enthalpy values are discussed in the context of carbon dioxide capture and sequestration. (C) 2012 Elsevier B. V. All rights reserved.