An XPS study of the KCl surface oxidation in oxygen glow discharge |
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| Affiliation: | 1. Abengoa, Campus Palmas Altas, C/Energía Solar 1, 41014 Sevilla, Spain;2. Photonic Group – ITMA Materials Technology, Calafates 11, 33417 Avilés, Spain;3. ICMS (CSIC-US), Americo Vespucio 49, 41092 Sevilla, Spain;1. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;2. Department of Electrical Engineering (ESAT), KU Leuven, Kasteelpark Arenberg 10, 3001 Heverlee, Belgium;3. imec—partner in Solliance, Kapeldreef 75, 3001 Heverlee, Belgium;4. Department of Materials Engineering (MTM), KU Leuven, Kasteelpark Arenberg 44, 3001 Heverlee, Belgium;5. Electronics and Information Systems Department (ELIS), University of Gent, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium;6. imec division IMOMEC—partner of Solliance, Wetenschapspark 1, 3590 Diepenbeek, Belgium;7. Institute for Material Research (IMO), Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium;8. SIM vzw, Technologiepark 935, 9052 Zwijnaarde, Belgium |
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| Abstract: | The reaction between the surface of KCl and oxygen in a glow discharge has been studied by X-ray photoemission spectroscopy (XPS). Oxygen glow discharge treatment resulted in the formation of a superoxide, which decomposed under vacuum at room temperature to KO2 and finally to K2O. No evidence of KClO3 or KClO4 formation has been found. Binding energies of some oxygen species in potassium oxides were determined. The possible role of potassium in K-doped silver catalysts of ethylene epoxidation is discussed. |
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