A near-ambient-pressure XPS study on catalytic CO oxidation reaction over a Ru(10 1 ̄ 0) surface

Ryo Toyoshima, Masahiro Shimura, Masaaki Yoshida, Yuji Monya, Kazuma Suzuki, Kenta Amemiya, Kazuhiko Mase, Bongjin Simon Mun, Hiroshi Kondoh

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We investigated the interactions of CO and O2 with Ru(101̄0) single crystal surfaces, and studied the in-situ catalytic oxidation reaction of CO on the surface under near realistic pressure conditions by using a combination of near-ambient-pressure x-ray photoelectron spectroscopy and differential pumping mass spectroscopy. At lower temperatures (T < 190 C), most of the surface keeps metallic and is covered by both chemisorbed atomic oxygen and CO, and the CO2 formation rate is relatively slow. At higher temperatures, the reaction rate significantly increases and reaches the saturation, where the Ru surface is dominated by a bulk oxide (i.e. RuO2).

Original languageEnglish
Pages (from-to)128-132
Number of pages5
JournalSurface Science
Publication statusPublished - 2014 Mar 1



  • CO oxidation
  • Catalysis
  • Mass spectroscopy
  • Near-ambient-pressure XPS
  • Ru(10 1 ̄ 0)

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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