A Facile Strategy for Pt Redispersion on TiO₂ for Enhanced SMSI Effect and Low-Temperature Reducibility

Particle size is critical in determining the catalytic behavior of noble metal catalysts. It is a significant interest for the rational design of clearly defined catalyst materials to research on noble metal nanoparticles. Herein, a facile prepared method for the Pt/TiO₂ catalysts can not only potentially benefit the reuse of industrial catalysts, but also help to reduce the cost of VOC catalytic oxidation. In this work, the calcination of Pt/TiO₂ catalyst under N₂ atmosphere achieves the redispersion of large Pt particles into small ones (~ 1.4 nm). The Pt/TiO₂-400 catalyst (calcinated at 400 °C) with smaller Pt particles and higher concentration of active sites has superior catalytic activity and stability of toluene oxidation, contributing to the strong metal-support interaction, the larger effective metal surface area, the excellent low-temperature reducibility, abundant amounts of Pt⁰ species and adsorbed oxygen species. This work provides a facile method for metal redispersion of the catalysts, maintaining high activity and excellent stability.