Methanol adsorption on a CeO2(1 1 1)/Cu(1 1 1) thin film model catalyst |
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Authors: | V. Matolí n,J. Libra,N. Tsud,T. Ská la |
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Affiliation: | a Charles University, Faculty of Mathematics and Physics, Department of Surface and Plasma Science, V Holešovi?kách 2, 18000 Prague 8, Czech Republic b Sincrotrone Trieste, Strada Statale 14, km 163.5, 34012 Basovizza-Trieste, Italy |
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Abstract: | Adsorption and desorption of methanol on a CeO2(1 1 1)/Cu(1 1 1) thin film surface was investigated by XPS and soft X-ray synchrotron radiation PES. Resonance PES was used to determine the occupancy of the Ce 4f states with high sensitivity. Methanol adsorbed at 110 K formed adsorbate multilayers, which were partially desorbed at 140 K. Low temperature desorption was accompanied by formation of chemisorbed methoxy groups. Methanol strongly reduced cerium oxide by forming hydroxyl groups at first, which with increasing temperature was followed by creation of oxygen vacancies in the topmost cerium oxide layer due to water desorption. Dissociative methanol adsorption and creation of oxygen vacancies was observed as a Ce4+ → Ce3+ transition and an increase of the Ce 4f electronic state occupancy. |
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Keywords: | Methanol Cerium oxide Photoelectron spectroscopy XPS Resonant photoemission Model catalyst |
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