Nanosized platinum particles loaded on the TiO2 nanoparticles were prepared to assess its photocatalytic activity in simple one-pot synthesis of quinaldines from anilines in ethanol using UV light. The catalyst was characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy, X-ray photoelectron spectra (XPS), Brunauer–Emmer–Teller surface area, atomic force microscope and diffuse reflectance spectra. XRD patterns revealed that the crystal structure of Pt–TiO2 resembled anatase phase of TiO2. The UV–Vis spectra indicated an increase in absorption of visible light when compared to TiO2. XPS analysis reveals that platinum particles are present mainly in metallic form. Furthermore, TEM analysis showed non-spherical-shaped Pt–TiO2 nanoparticles of the diameter 10–30 nm. Upon irradiation in the presence of Pt–TiO2, aniline and oxidation products derived from ethanol undergo condensation–cyclization to afford quinaldines. Higher efficiency of Pt–TiO2 than Au–TiO2 in the conversion of aniline to quinaldines is due to the higher work function of Pt.
Research on Chemical Intermediates – Springer Journals
Published: Oct 14, 2011
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