Theoretical and experimental analysis of the oxidation of CO on Pt catalysts supported on modified TiO2(101)

• CO adsorption is much stronger on the Pt/N–TiO2(101) doped catalyst.
• O vacancies in TiO2(101) are stabilized when coexisting with N as a dopant.
• CO conversion into CO2 by oxygen atoms of support surface is enhanced in Pt/N–TiO2.
• Pt/N–TiO2−x catalyst has the weakest PtC bond.

The dynamics of the CO adsorption on Pt nanoparticles deposited on TiO2(101) (pure, N-doped and/or reduced) have been investigated using UV–visible diffuse reflectance spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy and density functional theory. The results point to that N-doping and oxygen vacancies in the Pt/N–TiO2 system should favor catalytic reactions in which CO conversion into CO2 takes place mediated by support surface O atoms.

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