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Relevance of the Nitrite Route in the NO x Adsorption Mechanism over Pt–Ba/Al 2 O 3 NO x Storage Reduction Catalysts Investigated by using Operando FTIR Spectroscopy
Author(s) -
Lietti L.,
Daturi M.,
BlasinAubé V.,
Ghiotti G.,
Prinetto F.,
Forzatti P.
Publication year - 2012
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201100304
Subject(s) - nitrite , nox , catalysis , adsorption , chemistry , inorganic chemistry , redox , nitrate , organic chemistry , combustion
Nitrites dominate! Nitrites and nitrates are formed on the catalyst surface upon storage of NO x over a model Pt–Ba/Al 2 O 3 NO x 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 NO 2 adsorption following NO oxidation at Pt sites. The nitrite route is the unique pathway responsible for the storage of NO x at low temperatures, but it also dominates at high temperatures.