Abstract
The high resolution magic angle spinning 29 Si n.m.r. spectra of a number of dealuminated and ultrastable Y-zeolites have been studied. The well resolved spectra with narrow lines indicate a mainly regular structure and highly ordered Si-Al distribution of the zeolite framework. The quantitative distribution of the five building units Si(OSi) 4− n (OAl) n with n equal to 0−4 and the Si/Al ratio of the aluminosilicate lattice of the zeolites could be determined from the spectra. The degree of dealumination of the zeolite framework has been quantitatively estimated. By means of 1 H- 29 Si cross-polarization technique information on SiOH groups in defect centres of the dealuminated structure has been obtained.
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