Abstract

In situ MAS-NMR was used to study the reactions of styrene and methylstyrene on the acidic zeolites HZSM-5, HY, and H-mordenite. The results are introduced and discussed in the context of our recently proposed reclassification of typical zeolites as strong acids rather than superacids. We also show that the observation of indanyl cations but not simply phenylcarbenium ions as persistent species in high concentration is an expected consequence of the relative acid strengths of the zeolites and carbenium ions. 55 refs., 8 figs., 2 tabs.

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