SO2 reactivity on the MgO and CaO surfaces: A CW-EPR study of oxo-sulphur radical anions
✍ Scribed by Stefano Livraghi; M. Cristina Paganini; Elio Giamello
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 454 KB
- Volume
- 322
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Sulphur contamination of alkaline-earth oxide surfaces shows important consequences in many chemistry fields such as surface science and catalysis. We used the Electron Paramagnetic Resonance (EPR) technique to study the interaction of SO 2 molecules with the bare and electron enriched surfaces of MgO and CaO. Two paramagnetic products were identified via EPR thanks to this interaction, the SO 2
•-and S 2 O •-radicals whose abundance depends on the surface oxide properties. In particular, higher basicity and higher number of defects in the case of CaO lead to a higher amount of these two radical species.