Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 260, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118148
Keywords
Ag/CeO2; Metal-support interaction; Epitaxial growth of silver particles; CO oxidation; Soot combustion
Funding
- Russian Science Foundation [18-73-10109]
- Tomsk State University competitiveness improvement programme [8.2.03.2018]
- Russian Science Foundation [18-73-10109] Funding Source: Russian Science Foundation
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Ag/CeO2 catalysts with a silver loading of 10 wt.% have been prepared by three different techniques: impregnation, Ag/CeO2 (imp), impregnation of prereduced CeO2, Ag/CeO2 (red-imp), and co-deposition precipitation, Ag-CeO2 (co-DP). The features of the prepared composites have been studied by low-temperature N-2 sorption, TGA, XRF, TPR-H-2, TEM HR, XPS and Raman spectroscopy. The Raman and XPS results show that the addition of silver to CeO2 significantly increases the defectiveness of CeO2 particles, and such an effect is a function of the preparation method. The Ag-CeO2 (co-DP) and Ag/CeO2 (red-imp) catalysts show enhanced interfacial Ag-CeO2 interaction caused by the epitaxial growth of silver particles (d(111) = 2.35 angstrom) on the CeO2 surface (din = 3.1 angstrom) as well as high amount of oxygen vacancies. A morphology-dependent interplay between the oxygen vacancies and the strength of the Ag-CeO2 interaction has been revealed. Strengthening of the metal-support interaction enhances the catalytic activity of the composites in both CO oxidation and soot combustion.
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