Iron(III) porphyrin covalently supported onto magnetic amino-functionalized nanospheres as catalyst for hydrocarbon and herbicide oxidations
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Data
2012-07
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Resumo
This work describes the covalent immobilization of an ironporphyrin, 5,10,15,20-
tetrakis(pentafluorophenyl)porphyrin iron(III) chloride (FeTFPP), onto maghemite/silica magnetic
nanospheres covered with aminofunctionalized silica. The resulting material (γ-Fe2O3/SiO2-
NHFeP) was characterized by diffuse reflectance infrared spectroscopy (DRIFTS) and UV-Vis
absorption spectroscopy. The catalytic activity of this magnetic ironporphyrin was investigated
in the oxidation of hydrocarbons (styrene, (Z)-cyclooctene and R-(+)-limonene) and an herbicide
(simazine) by hydrogen peroxide or 3-chloroperoxybenzoic acid. Hydrocarbon and simazine
oxidation reaction products were analyzed by gas chromatography (GC) and high performance
liquid chromatography (HPLC), respectively. This catalytic system proved to be efficient and
selective for hydrocarbon oxidation, leading to high product yields from styrene (89%), cyclooctene
(71%) and R-(+)‑limonene (86%). Simazine oxidation was attained with 100% selectivity for
a dechlorinated product (OEAT), while several oxidation products were obtained for the same
catalyst in homogeneous media. The catalyst can be easily recovered through application of an
external magnetic field and washed after reaction. Catalyst reuse experiments for R-(+)-limonene
oxidation have shown that the catalytic activity is kept at 90% after 10 consecutive reactions.
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Magnetic nanospheres, Magnetic ironporphyrin, Hydrocarbon oxidation, Limonene, Simazine
Citação
SANTOS, Joicy S. dos et al. Iron(III) porphyrin covalently supported onto magnetic amino-functionalized nanospheres as catalyst for hydrocarbon and herbicide oxidations. Journal of the Brazilian Chemical Society, Campinas, v. 23, n. 8, p. 1411-1420, July 2012.