Oxygen storage capacity (OSC) of aged Pt/CeO2/Al2O3 catalysts: roles of Pt and CeO2 supported on Al2O3

In order to investigate the behavior of Pt and CeO2 on the Pt/CeO2/Al2O3 catalyst after aging at 1273 K, the oxygen storage capacity(OSC) has been measured and physically mixed catalysts such as View the MathML source + View the MathML source, View the MathML source, View the MathML source and View the MathML source catalysts have been employed for comparison. After the aging, the OSC of the physically mixed catalysts whose CeO2 was not supported on Al2O3 became poor because of the large-sized CeO2 and the deactivation of Pt, although those catalysts provided large OSC assisted by the PtCeO2 interaction before the aging. The OSC increment calculated by subtraction of the OSC of View the MathML source from that of Pt/CeO2/Al2O3 indicated that both the PtCeO2 interaction and the dispersed CeO2 on Al2O3 are essential for the generation of OSC, even after the aging.