Abstract
CeO2 has been extensively studied as a support material for platinum group metals because of the high catalytic activity of CeO2-supported catalysts in oxidation reactions. In particular, it has been reported that the Pt/CeO2 catalyst exhibits high CO oxidation activity after reductive treatment, thereby lowering the temperature of 50 % CO conversion to 150 ℃ or less. Such high activity of Pt/CeO2 has been attributed to the formation of active sites at the interface between the Pt nanoparticles (NP) and CeO2 surface. In this study, we attempt to deepen our understanding of the catalytic activity of Pt/CeO2 by studying the spillover of CO and O species at the interface. Combined kinetics and in situ CO-diffuse reflectance infrared Fourier transform spectroscopy studies reveal that CO spills over from Pt NPs to the CeO2 surface; this contributes to circumventing Pt poisoning by CO at low temperatures. Moreover, the CO oxidation activity of the Pt/CeO2 catalyst was considerably enhanced by simply mixing CeO2 particles with the Pt/CeO2 catalyst. This is explained by the formation of more reactive O atoms on the CeO2 surface after the reductive treatment. This study demonstrates that understanding the dynamic mobility of reactants is vital for discerning catalyst activity and designing more reactive catalysts.
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