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

摘要

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 (△H°) and entropy (△S°) from analysis of IR spectra recorded over a temperature range while simultaneously measuring equilibrium pressure inside a closed IR cell. △H° resulted to be -42.5 and -20.6kJ mol~(-1) for CO_2 and N_2, respectively. Corresponding values of △S° 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.