NDLI: Fundamental investigations of thermal aging phenomena of model NO$

Content Provider	Springer Nature Link
Author	Eberhardt, M. Riedel, R. Göbel, U. Theis, J. Lox, E. S.
Copyright Year	2004
Abstract	Investigations of the aging behavior induced by high temperatures coupled with oxidizing atmosphere of model NO$_{ x }$ storage systems Ba/Al$_{2}$O$_{3}$ and Ba/CeO$_{2}$ are reported in this paper. The samples were prepared, calcined and exposed to temperatures between 500 and 1000 °C in air for 12 h for thermal aging. Samples were characterized with XRD, HRSEM, DSC-TGA-MS and BET analyses. In XRD investigations of all model systems calcined at 500 °C for 2 h, the NO$_{ x }$ storage component was present in form of BaCO$_{3}$. The release of CO$_{2}$ as a result of the decarbonization of the NO$_{ x }$ storage component at increased temperatures was verified by thermogravimetric investigations. In the case of Ba/Al$_{2}$O$_{3}$, already during calcination a partial reaction of the NO$_{ x }$ storage component with Al$_{2}$O$_{3}$ resulting in the formation of barium aluminate was observed. In the model system Ba/CeO$_{2}$ the decomposition of the barium carbonate started above 780 °C and the formation of a barium cerium mixed oxide was observed. The presence of the barium containing NO$_{ x }$ storage component has a strong influence on the specific surface area of the model NO$_{ x }$ storage systems. The morphology and crystallite size of CeO$_{2}$ modified with the barium containing NO$_{ x }$ storage component exhibited distinct changes compared to the unmodified oxide. The NO$_{ x }$ storage efficiency determined by model gas tests of freshly prepared and engine aged model NO$_{ x }$ storage catalysts correlates well with the above described observations.
Starting Page	135
Ending Page	142
Page Count	8
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$_{ x }$ storage catalyst lean-burn thermal aging barium ceria 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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