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Release time:2017-11-29      Source:admin      Reads:56





  1H-71Ga internuclear spatial proximity/interaction between Brønsted acid site (BAS) and cationic Ga species (Lewis acid sites) in Ga-modified ZSM-5 zeolites, which leads to a synergic effect in the methanol-to-aromatics(MTA) conversion, was identified with solid-state NMR spectroscopy. The internuclear distance between BAS and Ga species was measured, which is similar to that of a neighboring BAS pair located in the six-membered rings of ZSM-5. The Brønsted acidity of the Ga-modified zeolite was considerably enhanced due to the synergic effect, and the synergic active sites were quantified by 1H-71Ga double-resonance solid-state NMR, which shows a correlation with the aromatics selectivity in the MTA reaction.