Particulate matter oxidation on Ruddlesden-Popper-type, La 1.8Sr1.2Mn2O7

Abstract

La1.8Sr1.2Mn2O7, La 0.5Sr1.5MnO4 and La0.8Sr 0.2MnO3 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 La 1.8Sr1.2Mn2O7 only shifted towards low energies. These suggested that an electron transfer from Mn-O planes to adsorbed oxygen in the La1.8Sr1.2Mn2O 7 was effective for improving the particulate matter oxidation activity. © 2011 The Ceramic Society of Japan. All rights reserved.