Topics in Catalysis

, Volume 30, Issue 1, pp 181–186

NOx adsorption study over Pt–Ba/alumina catalysts: FT-IR and reactivity study

  • I. Nova
  • L. Castoldi
  • F. Prinetto
  • V. Dal Santo
  • L. Lietti
  • E. Tronconi
  • P. Forzatti
  • G. Ghiotti
  • R. Psaro
  • S. Recchia
Article

DOI: 10.1023/B:TOCA.0000029747.17327.2c

Cite this article as:
Nova, I., Castoldi, L., Prinetto, F. et al. Topics in Catalysis (2004) 30: 181. doi:10.1023/B:TOCA.0000029747.17327.2c

Abstract

The NOx storage process over Ba/Al2O3 and Pt–Ba/Al2O3 NSR catalysts has been analyzed in this study by performing experiments at 350 °C with NO2 and NO/O2 mixtures using different complementary techniques (Transient Response Method, in situ FT–IR and DRIFT spectroscopies).

The collected data suggest that over the Pt–Ba/Al2O3 catalyst the NOx storage process from NO/O2 mixtures occurs forming at first nitrite species, which progressively evolve to nitrates. In addition, a parallel nitrate formation via disproportionation of NO2 (formed upon NO oxidation) cannot be excluded.

Keywords:

lean deNOxNOx storagePt–Ba/γ-Al2O3FT–IRDRIFTpulse experiments

Copyright information

© Plenum Publishing Corporation 2004

Authors and Affiliations

  • I. Nova
    • 1
  • L. Castoldi
    • 1
  • F. Prinetto
    • 2
  • V. Dal Santo
    • 3
  • L. Lietti
    • 1
  • E. Tronconi
    • 1
  • P. Forzatti
    • 1
  • G. Ghiotti
    • 2
  • R. Psaro
    • 3
  • S. Recchia
    • 4
  1. 1.Dip.CMIC “G. Natta”Politecnico di MilanoMilanoItaly
  2. 2.Dip. di Chimica IFMUniversità di TorinoTorinoItaly
  3. 3.ISTM-CNRMilanoItaly
  4. 4.Dip. Scienze CC, FF, MMUniversità dell’InsubriaComoItaly