IR SPECTROSCOPIC STUDY OF THE ADSORPTION OF MEOH AND H2O ON DECATIONIZED ZEOLITES

The IR spectra of decationized zeolites with adsorbed bases have been analyzed. A correlation between the shift Delta nu(OH) of the center o f gravity of the set of bands A, B, and C (components of the nu(OH) vi bration) and the strength of the H-bond between the bridging hydroxyl groups and the molecule of a base has been found. This is evidence in support of tile Fermi-resonance nature of the perturbations of the nu( OH) vibration. Spectral data on the adsorption of H2O and MeOH on deca tionized zeolites that cannot be interpreted in terms of the formation of complexes with strong H-bonds have been obtained. Arguments in fav or of the formation of H3O+ and MeOH(2)(+) ions linked to the neighbor ing oxygen atoms in the zeolite lattice via two identical hydrogen bri dges have been presented.