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Type: Artigo de periódico
Title: Epoxidation of Cyclohexene on Heterogenized Molybdenum Compounds
Author: Barradas, E.F.M.
Cestari, A.R.
Airoldi, C.
Buffon, R.
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
Subject: Epoxidation
functionalized silica
Editor: Brazilian Society of Chemical Engineering
Rights: aberto
Identifier DOI: 10.1590/S0104-66321998000200008
Date Issue: 1-Jun-1998
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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