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Epoxidation of Cyclohexene on Heterogenized Molybdenum Compounds

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Author(s): Barradas E.F.M. | Cestari A.R. | Airoldi C. | Buffon R.

Journal: Brazilian Journal of Chemical Engineering
ISSN 0104-6632

Volume: 15;
Issue: 2;
Date: 1998;
Original page

Keywords: Epoxidation | molybdenum | functionalized silica

ABSTRACT
Heterogenization of molybdenum species, starting either with Mo(CO)6 or MoO2(acac)2, on the surface of functionalized silicas bearing one (Si-Et1) or two (Si-Et2) ethylenediamine ligands was studied. The resulting systems are active in the catalytic epoxidation of cyclohexene by tert-butyl hydroperoxide. Using fresh catalysts, Si-Et2 results in higher selectivity, regardless of the Mo precursor. However, MoO2(acac)2-based systems are far more active. Formation of diols was never detected. Although XPS analyses point mainly to Mo(VI) species on the surface of all systems, UV-vis spectra suggest different ligands in their coordination sphere

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