Abstract
Abstract Silica nanoparticles supporting polyoxometalates (POMs), namely an iron(III) mono-substituted Keggin-type polyoxotungstate of formula α-[PW11FeIII(H2O)O39]4− and a sandwich-type tungstophosphate with the formula B-α-[(PW9O34)2FeIII4(H2O)2]6− were synthesized. The POM/SiO2 nanocomposites were obtained by alkaline hydrolysis of tetraethoxysilane using a reverse micelle and sol–gel technique. The spectroscopic studies suggest that the POMs were successfully immobilized on the silica nanoparticles. The catalytic activity of POM/SiO2 nanomaterials was tested in the epoxidation of geraniol using H2O2 as oxygen donor. The α-[PW11FeIII(H2O)O39]4−/SiO2 nanocomposite was the most efficient catalyst with high geraniol conversion and good regioselectivity for 2,3-epoxygeraniol.
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