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The 1 H magic-angle spinning nuclear magnetic resonance ( 1 H MAS NMR) spectra of acidic (bridging) hydroxyl (OH) groups on H-ZSM-5 zeolites were measured from room temperature to 373 K. The signal broadens with increasing temperature, indicating that the delocalization of the protons occurs at a temperature as low as 313 K. The broadening phenomena are less pronounced for H-ZSM-5...
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