Effect of photocatalytic activity of CO oxidation on Pt/TiO2 by strong interaction between Pt and TiO2 under oxidizing atmosphere

The effect of photocatalytic activity of CO oxidation on Pt/TiO2 catalysts under oxidizing atmosphere was investigated. A strong metal-support interaction (SMSI) between Pt and TiO2 have been found by means of XPS and in situ Ar+ sputtering test after Pt/TiO2 films being calcinated at 673 K under oxygen for 2 h, which was also corroborated by the photoelectrochemical measurement. When Pt/TiO2 catalysts were calcinated at 673 K in air, the SMSI between Pt and TiO2 occurred. Pt atoms on the surface thermally diffuse into the lattice of TiO2 grains, and then the contact resistance on the interface decreases. The migration velocity of the photo-generated electrons from the surface of TiO2 to Pt particles increases, which may bring out the enhancement of the photocatalytic activity of CO oxidation.

The effect of photocatalytic activity of CO oxidation on Pt/TiO2 catalysts by the strong metal-support interaction (SMSI) between Pt and TiO2 under oxidizing atmosphere has been investigated. The results show that the SMSI between Pt and TiO2 occurs when Pt/TiO2 catalysts are calcined at 673 K in air and the SMSI can improve obviously the photocatalytic activity of CO oxidation. Figure optionsDownload as PowerPoint slide