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The spatial proximity between Brønsted acid sites (BAS) in HZSM-5 zeolites is demonstrated by 1H double quantum (DQ) MAS NMR measurements. This proximity results in more pronounced polarization of adsorbed acetone and alkanes in zeolites, evident from 13C MAS NMR spectra. The adjacent BAS with synergistic interactions on alkane reactants (propane, n-butane, and n-pentane) cooperatively catalyze alkane...
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