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Benzylation of benzene by benzyl chloride over iron mesoporous molecular sieves materials

2003; Elsevier BV; Volume: 221; Issue: 1 Linguagem: Inglês

10.1016/s0021-9517(03)00295-1

1090-2694

Khaldoun Bacharı, J.M.M. Millet, B. Benaı̈chouba, O. Cherifi, F. Figuéras,

Catalytic Processes in Materials Science

The alkylation of benzene with benzyl chloride has been investigated over a series of iron-containing mesoporous silicas with different Fe contents. These materials (Fe-HMS-n) have been prepared at room temperature using a route based on hydrogen bonding and self-assembly between neutral primary amine micelles (S0) and neutral inorganic precursors (I0). They have been characterized by chemical analysis, BET, XRD, and UV–vis spectroscopy. The mesoporous Fe-containing materials were very active benzylation catalysts with almost 100% selectivity to monoalkylated product and showed excellent stability. The kinetics of the benzene benzylation over this catalyst have been thoroughly investigated. A mechanism in which the reaction could be initiated by an oxidation of benzyl chloride with formation of a charge transfer complex is proposed.