Adsorption of carbon dioxide on a faujasite-type H-Y zeolite (Si:Al = 2.6:1) was studied by variable-temperature (200-290 K range) infrared spectroscopy. Adsorbed CO2 molecules interact with the Bronsted acid Si(OH)Al groups located inside the zeolite supercage, bringing about a characteristic bathochromic shift of the O-H stretching mode from 3645 cm(-1) (free OH group) to 3540 cm(-1) (hydrogen-bonded CO2 adsorption complex). Simultaneously, the asymmetric (nu(3)) mode of adsorbed CO2 is observed at 2353 cm(-1). From the observed variation of the integrated intensity of the 3645 and 2353 cm(-1) IR absorption bands upon changing temperature, corresponding values of standard adsorption enthalpy and entropy were found to be Delta H degrees = -28.5(+/-1) kJ mol(-1) and Delta S degrees = -129(+/-10) J mol(-1) K-1. Comparison with the reported values of Delta H degrees for CO2 adsorption on other zeolites is briefly discussed. (C) 2009 Elsevier B.V. All rights reserved.