The role of metal-support interaction in Ag/CeO2 catalysts for CO and soot oxidation

Ag/CeO catalysts with a silver loading of 10 wt.% have been prepared by three different techniques: impregnation, Ag/CeO (imp), impregnation of prereduced CeO, Ag/CeO (red-imp), and co-deposition precipitation, Ag-CeO (co-DP). The features of the prepared composites have been studied by low-temperature N sorption, TGA, XRF, TPR-H, TEM HR, XPS and Raman spectroscopy. The Raman and XPS results show that the addition of silver to CeO significantly increases the defectiveness of CeO particles, and such an effect is a function of the preparation method. The Ag-CeO (co-DP) and Ag/CeO (red-imp) catalysts show enhanced interfacial Ag-CeO interaction caused by the epitaxial growth of silver particles (d = 2.35 Å) on the CeO surface (d = 3.1 Å) as well as high amount of oxygen vacancies. A morphology-dependent interplay between the oxygen vacancies and the strength of the Ag-CeO interaction has been revealed. Strengthening of the metal-support interaction enhances the catalytic activity of the composites in both CO oxidation and soot combustion.