Abstract
The highly active (La0.9K0.1CoO3)x/nmCeO2 catalysts consisting of comparably sized La0.9K0.1CoO3 active component and CeO2 support nanoparticle were studied on the catalytic combustion of soot by temperature-programmed oxidation (TPO) technique. The properties of oxygen species and the redox performances of catalysts were investigated by the method of O2-TPD and H2-TPR. During TPO process, all supported oxide catalysts showed lower Tm than the corresponding nanometer CeO2 support or pure La0.9K0.1CoO3 perovskite. The best catalytic activity was obtained over (La0.9K0.1CoO3)20/nmCeO2 catalyst (Tm= 354 °C), and its catalytic activity for the combustion of soot is as good as supported Pt catalysts. During the catalytic combustion of soot, the surface α oxygen species should play an important role. The formation of surface oxygen-containing complexes (SOC) may be one of the key intermediate species according to the results of in situ DRIFT, and NO2 released by surface nitrate species remarkably promote the so...
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