Abstract
Summary The present low-temperature 1 H MAS NMR investigations yield new information concerning the nature of acid sites responsible for the enhanced catalytic activity of “mildly” hydrothermally treated H-ZSM-5 zeolites. The enhancement of catalytic activity is either caused by Br0nsted acid sites of enhanced strength of acidity with a relatively broad distribution of deprotonation energies or by a synergism between Brensted acid sites of “normal” strength of acidity and Lewis acid sites. Furthermore, the existence of a new signal due to bridging hydroxyl groups influenced by an additional interaction with the zeolitic framework could be shown in H-ZSM-5 zeolites.
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