G.C. Laredo et al. / Applied Catalysis A: General 413–414 (2012) 140–148
147
concerted reaction mechanism. Therefore, a proposed explanation
regarding the acidity of the catalyst is that the alkylation reaction
needs Lewis acid sites to activate the electrophilic attack of the
benzene ring, and Brønsted acid sites to generate the carbonium-
ions. The electrophilic attack of the benzene is completed by the
carbonium ion through hydrogen substitution on the aromatic
ring.
In conclusion, our data suggest that the improved performance
of the MCM-22 mesoporous material may be related to (1) the
relationship between the number and strength of Brønsted and
Lewis acid sites and (2) a facilitated diffusion of reactants, prod-
ucts and coke precursors due to its unique crystalline structure.
These conclusions imply that the alkylation reaction might occur
by a concerted mechanism in which both the alkylating agent and
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