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Combined Fixed‐Bed Reactor and In Situ DRIFTS Tests of NO Adsorption on a NOx Storage‐Reduction System Catalyst
Author(s) -
Wu Dong L.,
Tschamber Valerie,
Limousy Lionel,
Michelin Laure,
Westermann Alexandre,
Azambre Bruno,
Fechete Ioana,
Garin François
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300209
Subject(s) - adsorption , catalysis , chemistry , platinum , nox , in situ , oxygen storage , inorganic chemistry , oxygen , chemical engineering , nitrate , nitrogen , organic chemistry , combustion , engineering
The effect of water on NO x storage performance of a Pt/BaO/Al 2 O 3 catalyst was investigated. The adsorption capacity of a model NO x storage‐reduction system (NSR) catalyst was studied in the presence of NO, oxygen, and water in nitrogen. Fixed‐bed and in situ DRIFTS adsorption tests were carried out in order to evaluate the influence of water on the adsorption capacity of the catalyst, adsorbed species on the surface of the catalyst, and stability of these species. The presence of water slightly reduces the NO x storage capacity of the NSR catalyst. A decrease of platinum oxidation activity was observed which was correlated to a slowdown of surface bidentate nitrate formation, detected by in situ DRIFTS tests. On the other hand, surface monodentate nitrates were favored and formation of bulk nitrates was not affected. A set of reactions corresponding to these observations is proposed.