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O: Oberflächenphysik

O 39: Oxide und Isolatoren II

O 39.1: Talk

Friday, March 28, 2003, 11:15–11:30, FOE/ORG

Interaction of NO with the RuO₂(110) surface — •Yuemin Wang, Anne Lafosse, Ursula A. Paulus, Karl Jacobi, and Gerhard Ertl — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin

The epitaxially grown RuO₂(110) surface exposes coordinatively unsaturated Ru-cus and O-bridge sites and was found to exhibit high catalytic activity for CO oxidation [1, 2]. In the present work we studied the adsorption and reaction of NO on RuO₂(110) at 85 K using high-resolution electron energy-loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). At exposures ≤ 0.5 L, NO adsorbs molecularly on top of Ru-cus and desorbs at 500 K. With increasing exposure the interaction of NO with the RuO₂(110) surface is quite complicated leading to coexistence of chemisorbed NO, N₂O, and NO₂. Based on isotope substitution experiments all losses are identified and the adsorption geometry of the different species will be discussed. Reaction mechanisms for NO reduction to N₂O and oxidation to NO₂ will be proposed.

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

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