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O: Fachverband Oberflächenphysik
O 65: Oxides and Insulators
O 65.8: Poster
Wednesday, March 18, 2015, 18:15–21:00, Poster A
CO2 adsorption on CeO2(110) single crystal surface — Chengwu Yang, •Alexei Nefedov, Jun Chen, Fabian Bebensee, and Christof Woell — Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
Interest in the adsorption of carbon dioxide on oxide surfaces arises not only from the need to mitigate emission of this greenhouse gas, but but also its potential use as a feedstock for the chemical industry [1]. Ceria, one of the most reducible metal oxide, has proven to be a highly active catalyst for CO2 reduction to methanol [2]. For a fundamental understanding of processes occurring on high surface-area CeO2 catalysts under reaction conditions, adsorption studies on well-defined single crystal surfaces in ultrahigh vacuum (UHV), i.e. the surface-science approach, is indispensable [3, 4]. Here we report results on CO2 adsorption onto pristine and defective CeO2(110) single crystal surfaces characterized using x-ray photoelectron spectroscopy, UHV infrared spectroscopy, and near edge x-ray absorption fine structure spectroscopy. Our data indicate that CO2 adsorbes predominantly as a carbonate on this ceria surface.
[1] M. Aresta (Ed.), Carbon Dioxide as Chemical Feedstock, Wiley-VCH, New York, 2010.
[2] J. Graciani, et al., Science, 2014, 345, 546.
[3] H.-J. Freund, M. W. Roberts, Surface Science Reports, 1996, 25, 225.
[4] Uwe Burghaus, Progress in Surface Science, 2014, 89, 161.