Topics in Catalysis

, Volume 42, Issue 1–4, pp 37–41

FT-IR study of NOX storage mechanism over Pt/BaO/Al2O3 catalysts. Effect of the Pt–BaO interaction

  • U. Elizundia
  • R. López-Fonseca
  • I. Landa
  • M. A. Gutiérrez-Ortiz
  • J. R. González-Velasco
Article

NOx storage mechanism over a model NSR catalyst has been analysed by means of in-situ FTIR. The results indicated that a two-step mechanism involving nitrite formation, without requirement of NO evolution to NO2, followed by oxidation to nitrate species, being both steps assisted by O2, would describe the overall process at 350 °C. This mechanism could be also extended to a wider temperature range. The interaction between Pt and Ba sites was crucial in this mechanism, since spillover process of oxidising agents appeared to play a key role. NO2 direct interaction with BaO surface may also occur, but this process was only dominant on Ba sites away from Pt interaction.

Keywords

NOx storage catalysts mechanism infrared spectroscopy 

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References

  1. 1.
    Prinetto, F., Ghiotti, G., Nova, I., Castoldi, L., Lietti, L., Tronconi, E., Forzatti, P. 2003Phys. Chem. Chem. Phys.54428CrossRefGoogle Scholar
  2. 2.
    Cant, N.W., Patterson, M.J. 2002Catal. Today73271CrossRefGoogle Scholar
  3. 3.
    Despres, J., Koebel, M., Kröcher, O., Elsener, M., Wokaun, A. 2003Appl. Catal. B13471Google Scholar
  4. 4.
    Epling, W.S., Campbell, L.E., Yezerets, A., Currier, N.W., Parks, J.E.,II 2004Catal. Rev.46163CrossRefGoogle Scholar
  5. 5.
    Fridell, E., Persson, H., Westerberg, B., Olsson, L., Skoglundh, M. 2000Catal. Lett.6671CrossRefGoogle Scholar
  6. 6.
    Fanson, P.T., Horton, M.R., Delgass, W.N., Lauterbach, J. 2003Appl. Catal. B46393CrossRefGoogle Scholar
  7. 7.
    Nova, I., Castoldi, L., Lietti, L., Tronconi, E., Forzatti, P., Prinetto, F., Ghiotti, G. 2004J. Catal.222377CrossRefGoogle Scholar
  8. 8.
    Lietti, L., Forzatti, P., Nova, I., Tronconi, E. 2001J. Catal.204175CrossRefGoogle Scholar
  9. 9.
    James, D., Fourré, E., Ishii, M., Bowker, M. 2003Appl. Catal. B45147CrossRefGoogle Scholar
  10. 10.
    Anderson, J.A., Bachiller-Baeza, B., Fernández-García, M. 2003Phys. Chem. Chem. Phys.54418CrossRefGoogle Scholar
  11. 11.
    Després, J., Elsener, M., Koebel, M., Kröcher, O., Schnyder, B., Wokaun, A. 2004Appl. Catal. B5073CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • U. Elizundia
    • 1
  • R. López-Fonseca
    • 1
  • I. Landa
    • 1
  • M. A. Gutiérrez-Ortiz
    • 1
  • J. R. González-Velasco
    • 1
  1. 1.Chemical Technologies for Environmental Sustainability Group, Department of Chemical Engineering, Faculty of Science and TechnologyUniversidad del Pais Vasco/EHUBilbaoSpain

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