Abstract
The alkylation of benzene with propene to produce cumene was carried out in batch (benzene/propene=20/1) at T=353 K and P=0.55 MPa over aluminum pillared bentonite (APB) exchanged with K+, La3+ and Al3+ cations. Both Al3+ and La3+ exchanged pillared clays were more active than APB. As expected a complete deactivation was observed for the K+ exchanged pillared clay. The large modifications of the catalytic activity cannot be explained by the observed slight textural differences. Cation exchange appeared to strongly modify the amount and nature of the clays acid sites. The relative amount of Lewis and Brønsted acid sites was evaluated by IR spectroscopy of adsorbed pyridine and analyzing the product distribution of the catalytic 1-butene isomerization. An apparent dependence of the reactivity from the amount of strong Lewis acid centers was clearly evident while a relationship with the amount of strong Brønsted acid sites was not found.
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