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

M. V. Grabchenko, G. V. Mamontov, V. I. Zaikovskii, V. La Parola, L. F. Liotta, O. V. Vodyankina

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

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 N2 sorption, TGA, XRF, TPR-H2, 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 (d111 = 2.35 Å) on the CeO2 surface (d111 = 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–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.

Original languageEnglish
Article number118148
Number of pages16
JournalApplied Catalysis B: Environmental
Volume260
DOIs
Publication statusPublished - Jan 2020

Keywords

  • Ag/CeO
  • CO oxidation
  • Epitaxial growth of silver particles
  • Metal–support interaction
  • Soot combustion
  • Ag/CeO2
  • PROBING DEFECT SITES
  • MIXED OXIDES
  • NANOSTRUCTURED CERIA
  • LOW-TEMPERATURE
  • AG/SIO2 CATALYSTS
  • STORAGE CAPACITY
  • SURFACE OXYGEN VACANCIES
  • BULK OXYGEN
  • Metal-support interaction
  • CERIUM OXIDE
  • DIFFERENT MORPHOLOGIES

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