Promotion of TiO2 Nanotube-Confined Pt Nanoparticles via Surface Modification with Fe2O3 for Ethylene Oxidation at Low Temperature

High Resolution Image Download MS PowerPoint Slide A modified confined catalyst with Pt nanoparticles on the interior and Fe 2 O 3 on the exterior surface of TiO 2 nanotubes (Pt-in/Fe 2 O 3 -TNTs) was prepared and investigated for catalyzing the oxidation of ethylene. Compared with the Pt-in/TNTs without Fe 2 O 3 modification, the Pt-in/Fe 2 O 3 -TNTs exhibited a significantly enhanced activity, and the complete conversion temperature of ethylene decreased from 170 to 95 °C. X-ray photoelectron spectroscopy analysis indicated that the Pt nanoparticles were stabilized at higher oxidation states in the Pt-in/Fe 2 O 3 -TNT catalyst. It was proposed that the modification of Fe 2 O 3 on the outer surface can tune the electronic state of the encapsulated Pt particles and accelerate the electrons transferred from Pt to Fe species via TiO 2 nanotubes, thus improving the catalytic oxidation performance of the confined catalyst.