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

• Published in: Applied surface science Vol. 259; pp. 367 - 370
• Main Authors: Arean, C.O., Bibiloni, G.F., Delgado, M.R.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-10-2012; Elsevier
• Subjects: Adsorption; Carbon dioxide; Carbon dioxide adsorption; CCS; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Enthalpy; Exact sciences and technology; Infrared spectroscopy; IR spectroscopy; Nitrogen adsorption; Physics; Spectroscopy; Surface chemistry; Thermodynamics; Zeolites; Thermodynamics; CCS; Carbon dioxide adsorption; Nitrogen adsorption; IR spectroscopy; Zeolites; Thermodynamic model; Infrared spectra; Nitrogen; Molecular sieves; Carbon
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.07.053

► Variable temperature IR spectroscopy is used to study adsorption of CO2 and N2 in the alkaline zeolite K-L. ► By simultaneously recording IR absorbance, temperature and equilibrium pressure, standard adsorption enthalpy and entropy for each gas was determined. ► The results are discussed in the broader context of gas separation using zeolites; focusing on carbon dioxide capture.
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 (ΔH°) and entropy (ΔS°) from analysis of IR spectra recorded over a temperature range while simultaneously measuring equilibrium pressure inside a closed IR cell. ΔH° resulted to be −42.5 and −20.6kJmol−1 for CO2 and N2, respectively. Corresponding values of ΔS° were found to be −182 and −151Jmol−1K−1. The obtained adsorption enthalpy values are discussed in the context of carbon dioxide capture and sequestration.