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Adsorption and reaction of CO on RuO2(110) surfaces

MPG-Autoren
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Wang,  Jinhai
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Fan,  Chao Yang
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Jacobi,  Karl
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Zitation

Wang, J., Fan, C. Y., Jacobi, K., & Ertl, G. (2001). Adsorption and reaction of CO on RuO2(110) surfaces. Surface Science, 481(1-3), 113-118. doi:10.1016/S0039-6028(01)01017-2.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-1823-5
Zusammenfassung
RuO2(1 1 0) single crystal surfaces were prepared by exposing a Ru(0 0 0 1) surface to high doses of O2 at 700 K. This surface exhibits coordinatively unsaturated (cus) Ru atoms (Ru-cus) onto which CO may adsorb at 85 K. Actually, high resolution electron energy loss spectroscopy reveals an energy of 262 meV (2115 cm-1) for the C–O stretch vibration of adsorbed CO indicating relatively weak binding in terminal configuration on Ru-cus. Thermal desorption spectroscopy shows partial desorption for temperatures above 250 K and, in parallel, formation of CO2 through reaction with neighboring surface oxygen atoms called O-bridge. Thereby, underlying Ru atoms become accessible onto which CO adsorbs more strongly giving rise to CO stretch-mode energies of 235 (1895) and 245 (1975) meV (cm-1). Hence, above 250 K, Ru-cus is not able to stabilize CO but serves as transient source for CO (and presumably other adsorbates), thus enabling the remarkable catalytic activity of this surface.