In this work, the promoting effects of the introduction of barium to FeCeO2-delta on soot oxidation were thoroughly studied. A series of FeCeO2-delta, BaFeCeO2-delta, and BaCeO2-delta was prepared by a self-propagating high-temperature synthesis method. The physiochemical properties of catalysts were investigated using Brunauer-Emmett-Teller, X-ray diffraction, transmission electron microscopy, NO temperature-programmed oxidation (NO-TPD), and NOx-TPD analysis. Ba(lO%)FeCe displays the best catalytic performance and possesses the lowest soot ignition temperature of 282 degrees C in the presence of NO. However, FeCeO2-delta was the most active one, showing the lowest soot ignition temperature of 342 degrees C in the absence of NO. NO- TPD demonstrates that barium loading in FeCeO2-delta dramatically improves the NOx adsorption and desorption capacity. In addition, in situ diffuse reflectance infrared Fourier transform spectroscopy indicates that NO can be adsorbed on catalysts' surfaces to form nitrite and nitrate species and that the corresponding nitrates species over BaFeCeO2-delta are stable at high temperatures, a characteristic that plays a crucial role and ensures the excellent performance of soot oxidation.