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Metalloporphyrins immobilized on silica-coated Fe3O4 nanoparticles: Magnetically recoverable catalysts for the oxidation of organic substrates

Paper ID Volume ID Publish Year Pages File Format Full-Text
40338 45850 2013 10 PDF Available
Title
Metalloporphyrins immobilized on silica-coated Fe3O4 nanoparticles: Magnetically recoverable catalysts for the oxidation of organic substrates
Abstract

•Preparation of solids for heterogeneous catalytic process of oxidation reaction.•Silica-coated Fe3O4 nanoparticles as a robust and inexpensive support for metalloporphyrins immobilization.•Efficiency and selectivity of solid catalyst for epoxidation and hydroxylation reactions.•Reasonably cheaper catalyst for heterogeneous catalysis of oxidation reaction with reuse capacity.•Easy magnetic recovery of the solid catalyst for reutilization.

In this paper we report the immobilization of different cationic and neutral metalloporphyrins (MPs) on silica-coated Fe3O4 nanoparticles, obtained by basic hydrolytic sol–gel process. We characterized the MP-immobilized materials by UV–vis spectroscopy (UV–vis), X-ray diffraction (XRD), infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). We achieved 100% and 2% immobilization of cationic and neutral MPs, respectively. The strong electrostatic interactions between the hydroxylated surface of the silica and the positive charges of the cationic MPs favored immobilization of the charged MPs; the neutral MP probably established a weak bond with the silica and easily leached from the support. We investigated the catalytic activity of the immobilized MPs in the oxidation of cyclooctene, cyclohexene, and cyclohexane using iodosylbenzene as oxygen donor. We used the immobilized MPs in at least five successive cyclooctene oxidation reactions – the yields did not decrease, confirming that the catalyst can be reused. The synthesized catalysts displayed magnetic properties, which allowed their fast separation from the reaction medium using a simple magnet.

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Keywords
Porphyrin; Fe3O4; Immobilization; Silica; Sol–gel; Catalysis; Oxidation
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Metalloporphyrins immobilized on silica-coated Fe3O4 nanoparticles: Magnetically recoverable catalysts for the oxidation of organic substrates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 459, 24 May 2013, Pages 121–130
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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