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FTIR spectroscopy shows that the first step of the interaction of pyrrole, furan and thiophene with H- $$\beta $$ and H-ZSM-5 zeolites is the formation of hydrogen bonded (precursor) species involving the Brønsted acid sites of the zeolite and the $$\pi $$ -electron system of the heterocyclic molecule. The precursors are then protonated to give monomeric BH+ (where B = C4H4NH, C4H4O or C...
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