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The acidity of the framework hydroxyl groups of H-ZSM-5 and H-boralite is investigated by means of proton magic angle spinning NMR and temperature programmed desorption of NH, (NH3-TPD). The acidity decreases on going from Si-OH-A1, the Bronsted acidic site in H-ZSM-5, to Si-OH-B, the Bronsted acidic site in H-boralite, to Si-OH, the terminating hydroxyl group of the zeolite lattice (silanol group). The sequence is in agreement with the NH,-TPD results.

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