Chemisorption and reactivity of nitric oxide on Na-dosed platinum{111}
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 93 (7) , 1425-1429
- https://doi.org/10.1039/a606375f
Abstract
The adsorption of NO on a sodium-precovered Pt{111} single crystal has been studied by temperature-programmed desorption (TPD) and the resulting sodium species characterised by Na KL 2,3 L 2,3 1 D X-ray excited Auger electron spectroscopy (XAES). Sodium strengthens the adsorption of NO and promotes its dissociation. At sufficiently high sodium coverages, all the adsorbed NO is dissociated and N 2 is the only nitrogen-containing desorption product: no N 2 O is observed. Na-promoted NO does not react with O a to form a surface nitrite. Differences between these results and previous work on K/Pt{111} prompted investigation of the effect of NO 2 impurity in the dosing gas. It was found that this could account for the observed differences. The surface sodium nitrite formed by NO 2 dosing was shown by XAES to be agglomerated and gave rise to a signal at 990.0 eV compared to 994.8 eV for clean sodium and 993.0 eV for sodium in the presence of NO.Keywords
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