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Updated: Jun 25, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
In situ solid-state (1)H NMR studies of hydration of the solid acid catalyst ZSM-5 in its ammonium form
Mingcan Xu1, Kenneth D M Harris, John Meurig Thomas
1School of Chemistry, Cardiff University, Park Place, Cardiff, CF10 3AT Wales, UK.
Abstract:
Hydration of the ammonium form of the solid acid catalyst ZSM-5 is investigated by applying a technique that has been developed recently for carrying out in situ solid-state NMR studies of adsorption processes. From (1)H MAS NMR spectra recorded as a function of time and temperature during the hydration process, insights are established on the nature of the interaction between the adsorbed water molecules and the ammonium cations in the ZSM-5 material. The change in isotropic chemical shift for the ammonium cations is consistent with the formation of N-Hcdots, three dots, centeredO hydrogen bonding with the water molecules. Studies of the adsorption of deuterated water, and dehydration of the hydrated material, are also reported.
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