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Issue 5, 2011
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[VO(acac)2] hybrid catalyst: from complex immobilization onto silicananoparticles to catalytic application in the epoxidation of geraniol

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Abstract

This work reports the preparation of a novel hybrid nanocatalyst through the immobilization of oxidovanadiumIV acetylacetonate ([VO(acac)2]) onto silica nanoparticles functionalized with 3-aminopropyltriethoxysilane (APTES) and its catalytic application in the allylic epoxidation of geraniol. All the nanomaterials were characterized by chemical analysis, X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The parent and amine-functionalized silica nanoparticles were also analyzed by 29Si and 13C solid-state nuclear magnetic resonance and the supported [VO(acac)2] nanomaterial was characterized by magnetic susceptibility measurement. The APTES organosilane was grafted onto the silica nanoparticles with an efficiency of 90%, through mono- and bidentate covalent grafting. The [VO(acac)2] complex was covalently anchored on the surface of the APTES-functionalized silica nanoparticles with 25% of efficiency. Magnetic susceptibility measurements in combination with XPS indicated that the oxidation state of the metal center (VO2+) was preserved upon the immobilization reaction. The catalytic performance of the novel hybrid [VO(acac)2] nanocatalyst was evaluated in the epoxidation of geraniol, at room temperature, using tert-butyl hydroperoxide as an oxygen source. The nanocatalyst presented 100% of substrate conversion, 99% of selectivity towards the 2,3-epoxygeraniol product and was stable upon reuse in further four cycles.

Graphical abstract: [VO(acac)2] hybrid catalyst: from complex immobilization onto silica nanoparticles to catalytic application in the epoxidation of geraniol

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Publication details

The article was received on 15 Mar 2011, accepted on 04 May 2011 and first published on 31 May 2011


Article type: Paper
DOI: 10.1039/C1CY00090J
Catal. Sci. Technol., 2011,1, 784-793

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    [VO(acac)2] hybrid catalyst: from complex immobilization onto silica nanoparticles to catalytic application in the epoxidation of geraniol

    C. Pereira, J. F. Silva, A. M. Pereira, J. P. Araújo, G. Blanco, J. M. Pintado and C. Freire, Catal. Sci. Technol., 2011, 1, 784
    DOI: 10.1039/C1CY00090J

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