Near Ambient Pressure XPS Investigation of CO Oxidation Over Pd3Au(100)

Marie D. Strømsheim, Jan Knudsen, Mari Helene Farstad, Linn Sørvik, Xiaoyang Guo, Hilde J. Venvik, Anne Borg

Research output: Contribution to journalArticlepeer-review

Abstract

The CO oxidation behavior under excess oxygen and near stoichiometric conditions over the surface of Pd3Au(100) has been studied by combining near-ambient pressure X-ray photoelectron spectroscopy and quadrupole mass spectrometry and compared to Pd(100). During heating and cooling cycles, normal hysteresis in the CO2 production, i.e. with the light-off temperature being higher than the extinction temperature, is observed for both surfaces. On both Pd3Au(100) and Pd(100) the (√5 × √5)R27° surface oxide structure is present during CO2 production under excess oxygen conditions (O2:CO = 10:1), while at near stoichiometric conditions (O2:CO = 1:1) the surfaces are covered with atomic oxygen. Au as alloying element hence induces only minor differences in the observed hysteresis and the active phase compared to pure Pd. Alloying with Au thus yields a different behavior compared to Ag, where reversed hysteresis is observed for CO2 production over Pd75Ag25(100) at similar conditions [Fernandes et al., ACS Catal. (2016) 4154].

Original languageEnglish
Pages (from-to)1439-1448
JournalTopics in Catalysis
Volume60
Issue number17-18
Early online date2017 May 31
DOIs
Publication statusPublished - 2017 Nov

Subject classification (UKÄ)

  • Chemical Engineering
  • Condensed Matter Physics

Free keywords

  • CO oxidation
  • Hysteresis
  • Near ambient X-ray photoelectron spectroscopy
  • PdAu(100)
  • Quadrupole mass spectrometry

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