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Element selective oxidation on Rh-Pd bimetallic alloy surfaces.

Hiroshi Kondoh1, Ryo Toyoshima, Naoki Shirahata

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Summary

Interactions between oxygen and Rh-Pd alloy surfaces were studied. Rh oxide formed on Rh1Pd9(100) and Pd oxide on Rh1Pd9(111), influenced by surface composition.

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Area of Science:

  • Surface Science
  • Materials Science
  • Catalysis

Background:

  • Rh-Pd bimetallic alloys are crucial in catalysis.
  • Understanding their surface interactions with oxygen is key to optimizing performance.
  • Oxidation behavior can vary significantly with surface structure and composition.

Purpose of the Study:

  • To investigate the oxidation behavior of Rh-Pd bimetallic alloy surfaces.
  • To elucidate the role of surface orientation and initial composition in oxide formation.
  • To compare experimental findings with theoretical predictions from density functional theory.

Main Methods:

  • Surface sensitive experimental techniques were employed.
  • Density functional theory (DFT) calculations were performed.
  • Alloy surfaces were oxidized under controlled oxygen pressures (10-5 Torr and 100 mTorr) at elevated temperatures (>250 °C).

Main Results:

  • A thin Rh oxide layer preferentially formed on the Rh1Pd9(100) surface.
  • A thin Pd oxide layer formed on the Rh1Pd9(111) surface.
  • Rh oxide is thermodynamically more stable, but its formation is kinetically controlled by the initial surface composition.

Conclusions:

  • The oxidation of Rh-Pd alloys is surface-specific.
  • Kinetic factors, particularly the initial Rh fraction, dictate which oxide forms.
  • This understanding is vital for designing catalysts with tailored surface properties.