In situ analysis of catalytically active Pd surfaces for CO oxidation with near ambient pressure XPS

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

Research output: Contribution to journalArticle

18 Citations (Scopus)


X-ray photoelectron spectroscopy (XPS) is useful for in situ analysis of catalytically active surfaces under reaction conditions. We conducted in situ observations of CO oxidation on Pd single-crystal surfaces with different orientations under near ambient pressure (NAP) conditions with XPS. In this short review we compare catalytically active surfaces of Pd with the different orientations. Both surface oxides and atomic oxygen chemisorbed on metallic surfaces can be active for CO oxidation depending on surface geometric structure. We propose similarity between the surface oxides and the chemisorbed oxygen from a viewpoint of availability of active oxygen. Catalytic activity of the metallic surface under NAP condition is also compared with that under ultrahigh vacuum conditions.

Original languageEnglish
Pages (from-to)14-20
Number of pages7
JournalCatalysis Today
Publication statusPublished - 2016 Feb 1



  • Ambient pressure XPS
  • CO oxidation
  • In-situ observation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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