Epoxidation of Cyclohexene on Heterogenized Molybdenum Compounds

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 hydropero...

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Bibliographic Details
Published in:Brazilian journal of chemical engineering 1998-06, Vol.15 (2), p.146-150
Main Authors: Barradas, E.F.M., Cestari, A.R., Airoldi, C., Buffon, R.
Format: Article
Language:English
Subjects:
ENGINEERING, CHEMICAL
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Summary: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
ISSN:0104-6632
1678-4383
0104-6632
DOI:10.1590/S0104-66321998000200008