Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 65: Oxides and Insulators

O 65.8: Poster

Mittwoch, 18. März 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.