Insight of Pt-support interaction in S-Pt/Ce0.7Zr0.3O2 by in situ Raman spectroscopy

摘要

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 H-2 Temperature-Programmed Reduction. Evidence of SMSI in Pt/CeO2 and Pt/Ce0.7Zr0.3O2 that improve the reduction properties of supports other than H-2 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 (Pt-1 (+) and Pt-2 +) 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.