The reaction of carbon monoxide with palladium supported on cerium oxide thin films

S. D. Senanayake, J. Zhou, A. P. Baddorf, D. R. Mullins

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36 Scopus citations

Abstract

In this study we probe the reaction of carbon monoxide with Pd nanoparticles supported on cerium oxide thin films. With the use of soft X-ray photoelectron spectroscopy (sXPS), and temperature programmed desorption (TPD) the surface intermediates and pathways leading to reaction products of CO on Pd supported on ceria were investigated. When Pd is supported on the stoichiometric CeO2 surface (Ce+4) only the molecular adsorption of CO on Pd is visible (286.4 eV). All of the CO desorbs below 520 K, however a small amount of O exchange between the CO and the ceria was indicated through the acquisition of labeled 18O from the substrate in the desorbed CO. The Pd nanoparticles are activated on partially reduced CeOx to promote the dissociation of <10% of the CO as indicated by a C-Pd species (284.4 eV) in sXPS. The C recombines with O from the ceria and desorbs between 600 and 700 K. The majority of the CO does not dissociate, however, and the degree of dissociation does not increase with the degree of ceria reduction. This result is in contrast with Rh nanoparticles supported on ceria where the degree of dissociation increased with the degree of ceria reduction and nearly total dissociation was obtained when the ceria was highly reduced.

Original languageEnglish
Pages (from-to)3215-3223
Number of pages9
JournalSurface Science
Volume601
Issue number15
DOIs
StatePublished - Aug 1 2007

Funding

S.D.S. would like to thank the efforts of Dennis Carlson (NSLS). Research sponsored by the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences, US Department of Energy, under Contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC. Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.

Keywords

  • Carbon monoxide
  • Cerium
  • Palladium
  • Scanning tunneling microscopy
  • Sintering
  • Soft X-ray photoelectron spectroscopy
  • Temperature programmed desorption
  • Thermal desorption

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