Abstract
The framework aluminium content of normal and dealuminated zeolite-Y may be obtained from 29Si n.m.r. data, unit cell constants or positions of infrared bands due to TO stretching modes. Using n.m.r. data as the primary means for determining framework aluminium the following equations were obtained: N AI =107.1(a o−24.238) N AI =0.766(1086.7− v 1) N AI =1.007(838.8− v 2) where N Al is the numbers of aluminium ions per unit cell, a o is the unit cell constant in Å, ν 1 is the wavenumber for the asymmetric O TO mode and ν 2 is the wavenumber for the symmetric mode.
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