Combined Fixed‐Bed Reactor and In Situ DRIFTS Tests of NO Adsorption on a NOx Storage‐Reduction System Catalyst. Issue 2 (11th November 2013)

• Record Type: Journal Article
• Authors: Wu, Dong L.; Tschamber, Valerie; Limousy, Lionel; Michelin, Laure; Westermann, Alexandre; Azambre, Bruno; Fechete, Ioana; Garin, François
• Is Part Of: Chemical engineering & technology. Volume 37:Issue 2(2014:Feb.)
• Page Start: 204
• Page End: 212
• Publication Date: 2013-11-11
• Subjects: Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.201300209
• Languages: English
• ISSNs: 0930-7516

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The effect of water on NO_x storage performance of a Pt/BaO/Al₂O₃ 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.</p> </abstract>