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Relevance of the Nitrite Route in the NOx Adsorption Mechanism over Pt–Ba/Al2O3 NOx Storage Reduction Catalysts Investigated by using Operando FTIR Spectroscopy

  1. Prof.  L. Lietti1,*,
  2. Prof.  M. Daturi2,
  3. Dr.  V. Blasin-Aubé2,
  4. Prof.  G. Ghiotti3,
  5. Dr.  F. Prinetto3,
  6. Prof.  P. Forzatti1

Article first published online: 4 NOV 2011

DOI: 10.1002/cctc.201100304

Issue

ChemCatChem

ChemCatChem

Volume 4, Issue 1, pages 55–58, January 2, 2012

Additional Information

How to Cite

Lietti, L., Daturi, M., Blasin-Aubé, V., Ghiotti, G., Prinetto, F. and Forzatti, P. (2012), Relevance of the Nitrite Route in the NOx Adsorption Mechanism over Pt–Ba/Al2O3 NOx Storage Reduction Catalysts Investigated by using Operando FTIR Spectroscopy. ChemCatChem, 4: 55–58. doi: 10.1002/cctc.201100304

Author Information

  1. 1

    Dipartimento di Energia, Laboratory of Catalysis and Catalytic Processes and NEMAS, Centre of Excellence Politecnico di Milano, P.zza L. Da Vinci 32, 20133 Milano (Italy), Fax: (+39) 02-2399-3318

  2. 2

    Laboratoire Catalyse et Spectrochimie, ENSICAEN, Université de Caen, CNRS, 6 Bd Maréchal Juin, F-14050 Caen (France)

  3. 3

    Dipartimento di Chimica IFM, NIS Centre of Excellence, Università di Torino via P. Giuria 7, 10125 Torino (Italy)

*Dipartimento di Energia, Laboratory of Catalysis and Catalytic Processes and NEMAS, Centre of Excellence Politecnico di Milano, P.zza L. Da Vinci 32, 20133 Milano (Italy), Fax: (+39) 02-2399-3318

Publication History

  1. Issue published online: 27 DEC 2011
  2. Article first published online: 4 NOV 2011
  3. Manuscript Received: 29 AUG 2011

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Keywords:

  • heterogeneous catalysis;
  • nitrites;
  • nitrates;
  • nitrogen oxides;
  • storage reduction catalysts
Thumbnail image of graphical abstract

Nitrites dominate! Nitrites and nitrates are formed on the catalyst surface upon storage of NOx over a model Pt–Ba/Al2O3 NOx storage–reduction catalyst. Nitrites are formed through the oxidation of NO at the Pt–Ba interface (nitrite route), while nitrates are formed upon nitrite oxidation and/or NO2 adsorption following NO oxidation at Pt sites. The nitrite route is the unique pathway responsible for the storage of NOx at low temperatures, but it also dominates at high temperatures.

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