Study of physisorption of carbon dioxide on naa zeolite. Part 1.—Experimental results obtained by infrared spectroscopy

Abstract

Infrared spectra of CO₂ physisorbed on NaA zeolites have been recorded at various temperatures between 178 and 423 K for a constant level of adsorption of ca. 0.5 molecule per cavity. The v₃ band profile shows a superposition of two or three bands whose intensities vary with respect to temperature. Preadsorption of water offers better conditions for the observation of bands 2 and 3 owing to the fact that band 1, which is the most intense in the absence of water, is suppressed. We assign the components of the v₃ band to different types of adsorption.