NDLI: Comparison between a Pt–Rh/Ba/Al$_{2}$O$_{3}$ and a newly formulated NO$_{ X }$-trap catalysts under alternate lean

Content Provider	Springer Nature Link
Author	Lesage, T. Verrier, C. Bazin, P. Saussey, J. Malo, S. Hedouin, C. Blanchard, G. Daturi, M.
Copyright Year	2004
Abstract	In situ FT-IR spectroscopy coupled with mass spectrometry have been used to study the mechanism of nitrates formation and reduction over a common Pt–Rh/Ba/Al$_{2}$O$_{3}$ NO$_{ x }$ storage catalyst, compared with a different alumina-based compound.The experimental device used consists of a transmission reactor cell (having a very small dead volume) dedicated to the evolution of surface species, and of a mass spectrometer combined with a FT-IR micro-cell for gas analysis, allowing time resolved analysis in stationary and transient conditions.At the first time the nitration properties of the catalysts under a lean flow have been studied in the appropriate temperature window (473–673 K). The dynamics of nitrates formation has been pointed out, as well as the different coordination sites on the compounds surface. Then the catalysts have been alternatively exposed to rich and lean flows very close to the real exhaust composition. This has allowed the identification of reduction pathway, active sites, intermediate species and by-products for NO$_{ X }$-trap reaction. In particular, we have differentiated the role of the support and of the noble metal in the mechanism, as well as of isocyanate adspecies and ammonia among the detected species. The very high NO$_{ X }$ storage properties and the selectivity (near 100%) in nitrogen of the newly designed catalyst have been pointed out.
Starting Page	31
Ending Page	36
Page Count	6
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	30
Issue Number	1-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NO$_{ X }$-trap Operando IR in situ reaction mechanism Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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