La 1.8 Sr 1.2 Mn 2 O 7 , La 0.5 Sr 1.5 MnO 4 and La 0.8 Sr 0.2 MnO 3 were prepared and their particulate matter oxidation was investigated by thermogravimetry method. Of the three perovskite oxides, La 1.8 Sr 1.2 Mn 2 O 7 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 La 1.8 Sr 1.2 Mn 2 O 7 only shifted towards low energies. These suggested that an electron transfer from MnO planes to adsorbed oxygen in the La 1.8 Sr 1.2 Mn 2 O 7 was effective for improving the particulate matter oxidation activity.
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