Abstract
FTIR spectra of chemisorbed pyrrole were recorded for a variety of alkali-exchanged zeolites including the Li, Na, K, Rb and Cs forms of X, Y, L, mordenite and ZSM-5 zeolites. Pyrrole being amphoteric can adsorb on both Lewis bases and Lewis acids and provide therefore a clear assessment of the nature of predominant adsorption sites on these materials. Data for propene aromatization conversion and selectivity are reported and correlated with FTIR of chemisorbed pyrrole results. This comparison allows to conclude that the primary sites for dehydrocyclization are not the basic oxygen sites but the Lewis acid cationic sites. The selectivity to aromatics and specially benzene selectivity depends however on the basic strength of the zeolite lattice as well as on the electropositivity of the cation.
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