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- Kwak, Ja Hun
- Molecular Catalysis Lab.
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NO2 adsorption on BaO/Al2O3: The nature of nitrate species
- Alternative Title
- NO2 adsorption on BaO/Al2O3: The nature of nitrate species
- Issued Date
- 2005-01
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.1, pp.27 - 29
- Abstract
- Temperature programmed desorption, infrared spectroscopy, and N-15 solid state NMR spectroscopy were used to characterize the nature of the nitrate species formed on Al2O3 and BaO/Al2O3 NOx storage/reduction materials. Two distinctly different nitrate species were found: surface nitrates that are associated with a monolayer BaO on the alumina support, and a bulk-like nitrate that forms on this thin BaO layer. The surface nitrates desorb as NO2 at lower temperatures than do the bulk-like nitrates, which decompose as NO+O-2 at higher temperatures. The amount of NOx stored in the monolayer nitrate is proportional to the surface area of the catalyst, while that in the bulk nitrate increases with BaO coverage
- Publisher
- AMER CHEMICAL SOC
- ISSN
- 1520-6106
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