Adsorption and Reaction on Oxide Surfaces: CO and CO2 on Cr2O3(111)

Kuhlenbeck, H.; Xu, C.; Dillmann, B.; Haßel, M.; Adam, B.; Ehrlich, D.; Wohlrab, S.; Freund, Hans-Joachim; Ditzinger, U. A.; Neddermeyer, H.; Neumann, M.; Neuber, M.

doi:10.1002/bbpc.19920960104

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Adsorption and Reaction on Oxide Surfaces: CO and CO₂ on Cr₂O₃(111)

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Kuhlenbeck, H., Xu, C., Dillmann, B., Haßel, M., Adam, B., Ehrlich, D., et al. (1992). Adsorption and Reaction on Oxide Surfaces: CO and CO₂ on Cr₂O₃(111). Berichte der Bunsen-Gesellschaft, 96(1), 15-27. doi:10.1002/bbpc.19920960104.

Cite as: https://hdl.handle.net/21.11116/0000-000E-7172-2

Abstract

Abstract We have investigated the adsorption of CO and CO₂ on epitaxially grown Cr₂O₂(111) by means of EELS. LEED, ARUPS, NEXAFS and XPS. CO is found to adsorb on the oxide surface in an ordered (√3 × √3)R30° structure with the molecular axis oriented approximately parallel to the surface. CO₂ on the other hand reacts with the chromium oxide to form a surface carbonate. Adsorption of CO, respectively reaction of CO₂ only takes place on a clean, freshly flashed oxide surface. Preadsorption of oxygen leads to a surface which is rather inert to adsorption, likely due to electronic or steric reasons.