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Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 51: Surface chemical reactions I

O 51.7: Talk

Thursday, March 26, 2009, 17:45–18:00, SCH A01

Interaction of Thin Nickel Oxide Layers with Carbon Oxides — •Michael Peter Andreas Lorenz1, Regine Streber1, Christian Papp1, Marie-Madeleine Walz1, Andreas Bayer1, Sandra Künzel2, Reinhard Denecke2, and Hans-Peter Steinrück11Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen — 2Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstr. 2, 04103 Leipzig

NiO is an important material in heterogeneous catalysis. Under ambient conditions, reaction with CO2 can easily lead to the formation of carbonates, which could block active sites and thereby influence the catalytic reactivity. Behm and Brundle [1] reported carbonate formation on Ni(100) by simultaneously dosing molecular oxygen and CO2. We have now studied the interaction of CO2 and also CO on an oxidised Ni(111) surface in great detail by in situ XPS applying synchrotron radiation at BESSY II. For both, characteristic peaks develop in the O 1s and C 1s spectra, albeit with different intensities, indicating the formation of carbonate layers. Similar results are obtained for thick oxidised Ni layers (∼2 ML) grown on Cu(111). In contrast, thin oxidised Ni layers (∼0.5 ML) on Cu(111) exhibit a significantly reduced reactivity towards carbonate formation. The decomposition of the carbonate species was determined in situ by XPS during heating. This work was supported by BMBF (05 ES3XBA/5) and the DFG through the Cluster of Excellence "Engineering of Advanced Materials".
R. J. Behm, C. R. Brundle, Surf. Sci. 255 (1991) 327

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