Tin-derivative sandwich-type polyoxometalates supported on Nd-doped TiO₂ nanoparticles as efficient and reusable catalysts in the oxidation of sulfides and alcohols

Abstract

New nanocomposites, including different loading levels of sandwich-type polyoxometalates [(HOSn^IVOH)₃(XW₉O₃₄)₂]ⁿ⁻ (X = As (1), P (2) n = 12 and Si (3) n = 14) on Nd-doped TiO₂ nanoparticles were prepared by a simple impregnation method. The nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, Fourier transform infrared (FTIR), and energy-dispersive X-ray spectroscopy. Compounds 1–3 were successfully loaded on Nd-doped crystallized anatase-phase TiO₂ nanoparticles of 20–25 nm. Catalytic activities of nanocomposites were examined by carrying out the oxidation of sulfides and alcohols with H₂O₂. Simple synthesis method, reusability, and low amounts of the heterogeneous catalysts with a slight excess of H₂O₂ and mild reaction conditions make these oxidation reactions an environmentally benign chemical process.

Keywords:

• Tin-derivative sandwich-type polyoxometalates
• Nd-doped titanium dioxide
• Nanocomposite
• Heterogeneous catalyst

Disclosure statement

No potential conflict of interest was reported by the authors.