The relationship between the surface oxygen species and the acidic properties of mesoporous metal oxides and their effects on propane oxidation

Abstract

The V, Cu and Mo catalysts change the surface oxygen species of meso-Mn₂O₃ and these have been used in the oxidation of propane. The oxygen species on the different catalysts were studied in detail, including in situ IR of propane under aerobic and anaerobic conditions, X-ray photoelectron spectroscopy (XPS) and in situ IR of CO₂ adsorption. The in situ IR experiments of NH₃ showed changes in the Lewis and Brønsted acids on the catalysts. We discuss the relationship between the acidic properties and the oxygen species. The results showed that the performance of the catalysts was significantly affected by the different oxygen species.