Abstract
In order to investigate the behavior of Pt and CeO 2 on the Pt/CeO 2/Al 2O 3 catalyst after aging at 1273 K, the oxygen storage capacity(OSC) has been measured and physically mixed catalysts such as Pt Al 2O 3 + CeO 2 Al 2O 3 , Pt Al 2O 3 + CeO 2 , Pt CeO 2 + Al 2O 3 and Pt CeO 2 + Pt Al 2O 3 catalysts have been employed for comparison. After the aging, the OSC of the physically mixed catalysts whose CeO 2 was not supported on Al 2O 3 became poor because of the large-sized CeO 2 and the deactivation of Pt, although those catalysts provided large OSC assisted by the PtCeO 2 interaction before the aging. The OSC increment calculated by subtraction of the OSC of Pt Al 2O 3 + CeO 2 Al 2O 3 from that of Pt/CeO 2/Al 2O 3 indicated that both the PtCeO 2 interaction and the dispersed CeO 2 on Al 2O 3 are essential for the generation of OSC, even after the aging.
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