The prevalence of surface oxygen vacancies over the mobility of bulk oxygen in nanostructured ceria for the total toluene oxidation

Jose Manuel López, Alexander L. Gilbank, Tomás García, Benjamín Solsona, Said Agouram, Laura Torrente-Murciano

Research output: Contribution to journalArticle

160 Citations (Scopus)
143 Downloads (Pure)

Abstract

This paper reveals the key importance of surface oxygen defects in the oxidation catalytic activity of nanostructured ceria. A series of nanostructured rods and cubes with different physico-chemical properties have been synthesized, characterized and tested in the total toluene oxidation. The variation of the temperature and base concentration during the hydrothermal syntheses of nanostructured ceria leads not only to different ceria morphologies with high shape purity, but also to structures with tuneable surface areas and defect concentrations. Ceria nanorods present a higher surface area and a higher concentration of bulk and surface defects than nanocubes associated with their exposed crystal planes, leading to high oxidation activities. However, for a given morphology, the catalytic activity for toluene oxidation is directly related to the concentration of surface oxygen defects and not the overall concentration of oxygen vacancies as previously believed.

Original languageEnglish
Pages (from-to)403-412
Number of pages10
JournalApplied Catalysis B: Environmental
Volume174-175
Early online date13 Mar 2015
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • Ceria
  • Crystal size
  • Morphology
  • Nanocubes
  • Nanoparticles
  • Nanorods
  • Nanostructures
  • Nanotubes
  • Surface oxygen vacancies
  • Toluene

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  • Projects

  • Stabilzation of Metal Nanoparticles

    Torrente Murciano, L.

    Engineering and Physical Sciences Research Council

    20/02/1319/10/14

    Project: Research council

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