Interaction of NO 2 with Model NSR Catalysts: Metal–Oxide Interaction Controls Initial NO x Storage Mechanism

Using scanning tunneling microscopy (STM), molecular‐beam (MB) methods and time‐resolved infrared reflection absorption spectroscopy (TR‐IRAS), we investigate the mechanism of initial NO x uptake on a model nitrogen storage and reduction (NSR) catalyst. The model system is prepared by co‐deposition...

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Bibliographic Details
Published in:Chemphyschem 2008-10, Vol.9 (15), p.2191-2197
Main Authors: Desikusumastuti, Aine, Staudt, Thorsten, Qin, Zhihui, Happel, Markus, Laurin , Mathias, Lykhach, Yaroslava, Shaikhutdinov, Shamil, Rohr, Friedemann, Libuda, Jörg
Format: Article
Language:English
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Summary:Using scanning tunneling microscopy (STM), molecular‐beam (MB) methods and time‐resolved infrared reflection absorption spectroscopy (TR‐IRAS), we investigate the mechanism of initial NO x uptake on a model nitrogen storage and reduction (NSR) catalyst. The model system is prepared by co‐deposition of Pd metal particles and Ba‐containing oxide particles onto an ordered alumina film on NiAl(110). We show that the metal–oxide interaction between the active noble metal particles and the NO x storage compound in NSR model catalysts plays an important role in the reaction mechanism. We suggest that strong interaction facilitates reverse spillover of activated oxygen species from the NO x storage compound to the metal. This process leads to partial oxidation of the metal nanoparticles and simultaneous stabilization of the surface nitrite intermediate.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.200800550