The surface oxide as a source of oxygen on Rh(1 1 1)

CO oxidation trends on Pt-group metals from ultrahigh vacuum to near atmospheric pressures: A combined in situ PM-IRAS and reaction kinetics study

“…These data show, however, that CO inhibition occurs on the different metal surfaces at different temperatures. Since the CO binding energy is similar on Pt, Pd, and Rh surfaces [2], this reaction inhibition is attributed to oxygen inhibition on the surfaces, as has been observed previously on Rh at low pressure [23] and in CO titration measurements on Rh [24]. Furthermore, this argument is readily extended to unsupported [3] and supported [25] Pd model catalysts.…”

Major Successes of Theory-and-Experiment-Combined Studies in Surface Chemistry and Heterogeneous Catalysis

“…The investigation of the reduction of the (9 9 9) Rh surface oxide by CO at CO partial pressure of 2 9 10 -8 mbar and 375 K found that the surface oxide can be reduced even though CO does not adsorb easily on the surface under the given experimental conditions [53]. Both HRCLS and STM results showed that atomic oxygen is expelled from the oxide layer onto the reduced metallic areas.…”

Combined experiment and theory approach in surface chemistry: Stairway to heaven?

“…In the process of metal oxide formation, the metal-metal bonding needs to be replaced by a metal-oxygen bond, a process that is thermally activated. But also dissociative adsorption of oxygen can become rate-determining since a saturated overlayer of chemisorbed oxygen is known to inhibit the further dissociative adsorption of oxygen at the surface [93,9,94].…”