Influence of CeO 2 addition on the physicochemical and catalytic properties of Pd/TiO 2 catalysts in CO oxidation

The influence of CeO 2 addition on the formation of the microstructure, electronic state, and catalytic properties of Pd/TiO 2 supported catalysts in CO oxidation were investigated. It was shown that, when Pd is supported on titanium dioxide modified with cerium dioxide, annealing at 500°C results in the formation of Pd/(CeO 2 -TiO 2 ) catalysts with a nanocrystalline structure composed of incoherently intergrown fine anatase crystals and interblock boundaries in which palladium and cerium are stabilized. The higher catalytic activity of Pd/(CeO 2 -TiO 2 ) catalysts compared to Pd/TiO 2 catalysts is explained by the smaller size of Pd particles and the higher proportion of palladium in the Pd δ+ state.