Abstract
In the present paper we report a new approach for determination of the distribution of different types of Briinsted hydroxyls. It is based on a study of weak hydrogen bonding in the model system, hydroxyls in H-ZSM-5, perturbed by adsorbed weak bases. The correlation obtained from this study of the increase in the intensity of the band, resulting from the perturbation, with the frequency shift, can then be transferred to the perturbation caused by oxygens in six-membered rings of @ cages in faujasite-like materials. The distribution of Bronsted hydroxyls between super and fl cages obtained from the FTIR spectra, using this correlation, agrees with lH MAS NMR results. An estimation of the extinction coefficients for the HF and LF bands in H-Y is made.
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