Abstract

Acid and catalytic properties of H,NaZSM-5 (Si/Al = 47) zeolites of various exchange degrees (0–98%) were studied. H,NaZSM-5 zeolites contain Lewis acid sites and two kinds of Bronsted sites (strong sites: 3609 cm−1 OH groups, and weak sites: not being those OH groups). The concentration of all these sites was determined. Weak Bronsted sites are inactive in all the reactions studied. In the zeolites of exchange degrees higher than 11%, the conversion increases linearly with the number of 3609 cm−1 OH groups.

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