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Prof.  L. Lietti, Prof.  M. Daturi, Dr.  V. Blasin-Aubé, Prof.  G. Ghiotti, Dr.  F. Prinetto and Prof.  P. Forzatti 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

Article first published online: 4 NOV 2011 | DOI: 10.1002/cctc.201100304

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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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