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La1.8Sr1.2Mn2O7, La0.5Sr1.5MnO4 and La0.8Sr0.2MnO3 were prepared and their particulate matter oxidation was investigated by thermogravimetry method. Of the three perovskite oxides, La1.8Sr1.2Mn2O7 gave a higher oxidation activity than the other two oxides at a practical level of temperature. The properties of these oxides were also investigated by X-ray photoelectron spectroscopy. The Mn 2p core-level spectra of the La1.8Sr1.2Mn2O7 only shifted towards low energies. These suggested that an electron transfer from Mn–O planes to adsorbed oxygen in the La1.8Sr1.2Mn2O7 was effective for improving the particulate matter oxidation activity.

Particulate matter oxidation on Ruddlesden-Popper-type, La1.8Sr1.2Mn2O7