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Low-temperature 1 H magic-angle spinning nuclear magnetic resonance (MAS NMR) and various rotor-synchronous spin echo 1 H MAS NMR experiments have been applied to characterize partially dealuminated and weakly rehydrated zeolites H-Y. The signal caused by water adsorption on Lewis acid sites does not change at 160 K in comparison to room temperature. Spin echo 1 H MAS NMR experiments with dipolar dephasing by means of high-power 27 Al irradiation confirm that the water molecules must be close to aluminium sites. Two models of water adsorption on Lewis acid sites are discussed.