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

Juan Li; Liangpeng Wu; Nan Wang; Xinjun Li; Chaoping Cen

doi:10.1021/acsomega.1c00665

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

ACS Omega. 2021 Apr 20;6(17):11529-11536. doi: 10.1021/acsomega.1c00665. eCollection 2021 May 4.

Authors

Juan Li¹, Liangpeng Wu¹, Nan Wang¹, Xinjun Li¹, Chaoping Cen²

Affiliations

¹ Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China.
² South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China.

Abstract

A modified confined catalyst with Pt nanoparticles on the interior and Fe₂O₃ on the exterior surface of TiO₂ nanotubes (Pt-in/Fe₂O₃-TNTs) was prepared and investigated for catalyzing the oxidation of ethylene. Compared with the Pt-in/TNTs without Fe₂O₃ modification, the Pt-in/Fe₂O₃-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/Fe₂O₃-TNT catalyst. It was proposed that the modification of Fe₂O₃ 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 TiO₂ nanotubes, thus improving the catalytic oxidation performance of the confined catalyst.