期刊
CHEMPHYSCHEM
卷 9, 期 15, 页码 2191-2197出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200800550
关键词
heterogeneous catalysis; IR spectroscopy; model catalysts; molecular beams; reaction mechanisms
资金
- DFG
- DAAD
- EU [COST D-41]
- Fonds der Chemischen Industrie
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, 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, 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 NOx storage compound to the metal. This process leads to partial oxidation of the metal nanoparticles and simultaneous stabilization of the surface nitrite intermediate.
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