The catalytic reduction of NO by H2 on Ru(0 0 0 1): Observation of NHads species

Hornung, Alessandra; Zemlyanov, Dmitri; Muhler, Martin; Ertl, Gerhard

doi:10.1016/j.susc.2005.10.037

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The catalytic reduction of NO by H₂ on Ru(0 0 0 1): Observation of NH_ads species

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

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Hornung, A., Zemlyanov, D., Muhler, M., & Ertl, G. (2006). The catalytic reduction of NO by H₂ on Ru(0 0 0 1): Observation of NH_ads species. Surface science, 600(2), 370-379. doi:10.1016/j.susc.2005.10.037.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-05AC-E

Abstract

Adsorption of NO and the reaction between NO and H2 were investigated on the Ru(0 0 0 1) surface by X-ray photoelectron spectroscopy (XPS). Surface composition was measured after NO adsorption and after the selective catalytic reduction of nitric oxide with hydrogen in steady-state conditions at 320 K and 390 K in a 30:1 mixture of H2 and NO (total pressure = 10_4 mbar). After steady-state NO reduction, molecularly adsorbed NO in both the linear on-top and threefold coordinations, NHads and Nads species were identified by XPS. The coverage of the NHads and Nads species was higher after the reaction at 390 K than the corresponding values at 320 K. Strong destabilisation of Nads by Oads was detected. A possible reaction mechanism is discussed.