Interaction of NO with the O-rich RuO2(110) surface at 300 K

Jacobi, Karl; Wang, Yuemin

doi:10.1016/j.susc.2008.09.047

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Interaction of NO with the O-rich RuO₂(110) surface at 300 K

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

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Wang, Yuemin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Jacobi, K., & Wang, Y. (2009). Interaction of NO with the O-rich RuO₂(110) surface at 300 K. Surface Science, 603(10-12), 1600-1604. doi:10.1016/j.susc.2008.09.047.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-F90B-A

Abstract

The interaction of NO with the O-rich RuO2(1 1 0) surface, exposing coordinatively unsaturated O-bridge, O-cus, and Ru-cus atoms, was studied at 300 K by thermal desorption spectroscopy (TDS) and high-resolution electron energy-loss spectroscopy (HREELS). The conclusions are validated by isotope substitution experiments with 18O. During exposure to NO an O···N–O surface group (NO2-cus) is formed with O-cus. Additionally, a smaller number of empty Ru-cus sites are filled by NO-cus. If one warms the sample to 400 K, NO2-cus does not desorb but decomposes into O and NO again, the latter being either released into gas phase or adsorbed as NO-cus. With O-bridge such a surface group is not stable at 300 K. Our experiments further prove that O-cus is more reactive than O-bridge.