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Ceria reoxidation by CO2: A model study

Staudt T, Lykhach Y, Tsud N, Skala T, Prince KC, Matolin V, Libuda J (2010)

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Publication Status: Published

Publication Type: Journal article

Publication year: 2010

Journal

Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE

Book Volume: 275

Pages Range: 181-185

Journal Issue: 1

DOI: 10.1016/j.jcat.2010.07.032

Abstract

The activation of CO2 on ceria-based catalysts opens chemical routes to the use of CO2 as an oxidizing agent. Toward a better understanding of the underlying surface reactions, we have performed a model study on well-defined CeO2-x thin films on Cu(1 1 1) under ultra-high-vacuum conditions. Resonant photoelectron spectroscopy is used as a highly sensitive tool to monitor changes in the oxidation state of cerium as a function of CO2 exposure and thermal treatment. It is shown that partial reoxidation of CeO2-x by CO2 occurs with high reaction probabilities (i) even at temperatures as low as room temperature, (ii) on pure CeO2-x in the complete absence of any noble metal co-catalysts, and (iii) in the absence of surface hydroxyl groups or water. In contrast to previous studies on ceria powders, the findings clearly demonstrate the high activity of pure hydroxyl- and metal-free ceria surfaces for CO2 activation, even at low reaction temperatures. (C) 2010 Elsevier Inc. All rights reserved.

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APA:

Staudt, T., Lykhach, Y., Tsud, N., Skala, T., Prince, K.C., Matolin, V., & Libuda, J. (2010). Ceria reoxidation by CO2: A model study. Journal of Catalysis, 275(1), 181-185. https://dx.doi.org/10.1016/j.jcat.2010.07.032

MLA:

Staudt, Thorsten, et al. "Ceria reoxidation by CO2: A model study." Journal of Catalysis 275.1 (2010): 181-185.

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