Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 16: Oxide und Isolatoren I

O 16.8: Vortrag

Dienstag, 25. März 2003, 13:00–13:15, FOE/ANOR

CO oxidation on the O-enriched RuO₂(110) Surface at low Temperatures — •Ursula A. Paulus, Yuemin Wang, Peter Geng, and Karl Jacobi — Fritz-Haber Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin

The RuO₂(110) single crystal surface exposing coordinatively unsaturated Ru (Ru-cus) and oxygen (O-bridge) atoms, has been proven to be an efficient catalyst for the oxidation of CO even at ambient temperature conditions [1, 2, 3]. An O-enriched RuO₂(110) surface is obtained by dissociative adsorption of O₂ giving rise to weakly bonded O-cus atoms on top of Ru-cus. There is wide agreement concerning the oxidation of CO to CO₂ on bare and O-enriched RuO₂(110) surface at room and elevated temperatures. In the present work we applied high-resolution electron energy-loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS) in order to investigate the interaction of CO with the O-enriched RuO₂(110) surface between 85 and 300 K. This allowed the additional direct monitoring of the CO oxidation via TDS. We confirm that CO reacts first with O-cus and then with O-bridge. The relative contributions of these reaction channels depend on the exposure ratio of O₂ and CO.

[1] C.Y. Fan, J. Wang, K. Jacobi, and G. Ertl, J. Chem. Phys. 114, 10058 (2001).

[2] J. Wang, C.Y. Fan, K. Jacobi, and G. Ertl, Surf. Sci. 481, 113 (2001).

[3] J. Wang, C.Y. Fan, K. Jacobi, and G. Ertl, J. Phys. Chem. B. 106, 3422 (2002).