The Effect of Heat Treatment on Interaction, Microstructure and Oxygen Storage Capacity of Pt Added CeO2 on Alumina

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We investigated the morphology, temperature programmed reduction (TPR) and oxygen storage capacity (OSC) of Pt-added CeO2 on alumina. The effect of heat treatment on interaction and microstructure of Pt and CeO2 on alumina was investigated by the comparison of the peak temperature in the TPR profiles as well as the improvement of OSC by Pt addition. The active interaction of Pt and CeO2 appeared as the TPR peak at 160°C but degenerated by the sintering of Pt after heat treatment at 1000°C. After the atomistic interaction of Pt/CeO2 is destroyed by high-temperature treatment, the oxygen is released via the diffusion on the surface to react with hydrogen on Pt at around 260°C. The Pt/CeO2 site become inactive because of sintering of Pt particles, and then the OSC was weakened.

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