Article Dans Une Revue Ionic and Mixed Conducting Ceramics 8 Année : 2012

Ionically conducting ceramics for soot oxidation. Mechanistic study with O-18(2) isotopic exchange

L. Lizarraga
  • Fonction : Auteur
E. Obeid
  • Fonction : Auteur
M. N. Tsampas
  • Fonction : Auteur
A. Boreave
M. C. Steil
  • Fonction : Auteur
P. Vernoux

Résumé

This study shows that Yttria-Stabilized Zirconia (YSZ) is an effective catalyst for soot particles oxidation. Soot oxidation already occurs from 270 degrees C. Temperature-Programmed Oxidation experiments with O-18(2) demonstrate the key-role of bulk oxygen species in the oxidation process. To the best of our knowledge, this is the first time that such a result is reported for a purely O-2-ionically conducting ceramic without any redox property. We assume that the soot oxidation takes place via a fuel-cell type electrochemical mechanism at the nanometric scale. Electrochemical oxidation of the soot takes place at the soot/YSZ interface while oxygen electrochemical reaction occurs at the triple phase boundary.

Dates et versions

hal-01073450 , version 1 (09-10-2014)

Identifiants

Citer

L. Lizarraga, E. Obeid, M. N. Tsampas, A. Boreave, M. C. Steil, et al.. Ionically conducting ceramics for soot oxidation. Mechanistic study with O-18(2) isotopic exchange. Ionic and Mixed Conducting Ceramics 8, 2012, 45, pp.225-233. ⟨10.1149/1.3701312⟩. ⟨hal-01073450⟩
108 Consultations
0 Téléchargements

Altmetric

Partager

  • More