Abstract
Strong Metal-Support Interactions (SMSI) are important in Pt supported catalysts for their catalytic performance. SMSI in Pt/CeO2, Pt/Ce0.7Zr0.3O2 and single atom S-Pt/Ce0.7Zr0.3O2 catalysts were studied by in situ Raman spectroscopy and H2 Temperature-Programmed Reduction. Evidence of SMSI in Pt/CeO2 and Pt/Ce0.7Zr0.3O2 that improve the reduction properties of supports other than H2 dissociation and spillover is obtained. It was also found that Pt-O and Pt-O-Ce bonding in the said catalysts play an important role in SMSI. The Pt bonding could be ascribed to Pt oxides species (Pt1+ and Pt2+) with different Pt adsorption sites on CeO2 surface and which act as intermediates in reduction process. This gives a new insight into the SMSI and explains the observed Pt/CeO2 reduction characteristics.
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