The interaction of oxygen with the surface of CeO2–TiO2 mixed systems: an example of fully reversible surface-to-molecule electron transfer

Abstract

The interaction of oxygen with the surface of CeO₂–TiO₂ mixed oxides prepared via sol–gel was investigated by means of electron paramagnetic resonance (EPR). Upon admission of molecular oxygen onto the surface of the as prepared materials (which underwent final oxidative calcination) the formation of superoxide O₂⁻ ions is observed without the need for preliminary annealing in a vacuum and consequent oxygen depletion. The superoxide species is symmetrically adsorbed (“side-on” structure) on the top of a Ce⁴⁺ ion. Surprisingly the electron transfer is fully reversible at room temperature having the typical behavior shown by molecular oxygen carriers, which, however, link to oxygen in a completely different manner (“end-on” structure). We suggest that the active sites are Ce³⁺ ions present in the stoichiometric cerium titanate which forms during the synthesis. The features of these Ce³⁺ ions must be different from those of the same ions formed in CeO₂ by reductive treatments, which show a different reactivity to O₂. The observation reported here opens up innovative perspectives in the field of heterogeneous catalysis and in that of sensors as the total reversibility of the electron transfer is observed in a significant range of oxygen pressure.