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Cumene conversion under an excess of benzene is studied over a series of mordenite (MOR) zeolites (Na-MOR, HNa-MOR, H-MOR and dealuminated H-MOR) by in situ 13 C and 1 H MAS NMR spectroscopy in the temperature range 298-473 K. By tracing the fate of 13 C labeled atoms in the benzene molecule, intermolecular transalkylation, disproportionation and isomerization reactions...