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

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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.

LanguageEnglish
Pages403-412
Number of pages10
JournalApplied Catalysis B: Environmental
Volume174-175
Early online date13 Mar 2015
DOIs
StatusPublished - 1 Sep 2015

Fingerprint

Cerium compounds
Toluene
Oxygen vacancies
toluene
defect
Oxygen
oxidation
Oxidation
oxygen
Defects
Catalyst activity
surface area
Hydrothermal synthesis
Surface defects
Nanorods
Chemical properties
chemical property
crystal
Crystals
temperature

Keywords

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

Cite this

The prevalence of surface oxygen vacancies over the mobility of bulk oxygen in nanostructured ceria for the total toluene oxidation. / López, Jose Manuel; Gilbank, Alexander L.; García, Tomás; Solsona, Benjamín; Agouram, Said; Torrente-Murciano, Laura.

In: Applied Catalysis B: Environmental, Vol. 174-175, 01.09.2015, p. 403-412.

Research output: Contribution to journalArticle

López, Jose Manuel ; Gilbank, Alexander L. ; García, Tomás ; Solsona, Benjamín ; Agouram, Said ; Torrente-Murciano, Laura. / The prevalence of surface oxygen vacancies over the mobility of bulk oxygen in nanostructured ceria for the total toluene oxidation. In: Applied Catalysis B: Environmental. 2015 ; Vol. 174-175. pp. 403-412.
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