| Abstract
| - Up to now the distribution of Al atoms in the zeolite latticecould be monitored mainly by 29Si MASNMR.The data about the nonequivalent aluminium T sites, present in the27Al MAS NMR spectra, was obscuredby second-order effects of quadrupolar interaction. By applyingthe five-quantum 27Al MQMAS NMR methodto ZSM-5 type zeolites, we were able to distinguish at least twononequivalent aluminium T sites in theH-ZSM-5 and establish the relation between 27Al,29Si, and 1H NMR data. Comparisonwith 29Si MAS NMRspectra gives information about the distribution and siting ofaluminium in the zeolite framework.
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