Molecular adsorption on V2O3(0001)/Au(111) surfaces

Athula Bandara, Mohammad Abu-Haija, Frank Höbel, Helmut Kuhlenbeck, Günther Rupprechter, Hans Joachim Freund

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The adsorption of carbon monoxide (CO), propane (C3H8) and propene (C3H6) on V2O3(0001) films grown on Au(111) was studied by Temperature Programmed Desorption (TPD) and X-ray Photoelectron Spectroscopy (XPS). The ‘‘oxidized’’ surface (i.e., as prepared exhibiting V=O termination), the ‘‘reduced’’ surface (i.e., V=O groups being removed by electron irradiation), as well as the oxygen pre-covered reduced surface were investigated. Both TPD and XPS indicate that the oxidized surface has little affinity for CO adsorption, while the reduced surface readily binds CO (CO amount approx. 10 times higher). Accordingly, CO can be used to titrate the presence or absence of vanadyl oxygen (via adsorption on the vanadium atoms) but also of defects like surface oxygen vacancies. For propane and propene, desorption of the parent molecules was the major process, i.e., surface reactions were absent under the applied conditions. When oxygen was pre-adsorbed on the reduced surface, the adsorption properties resembled that of the oxidized surface, i.e., the vanadyl groups were (partially) re-established. TPD and XPS provide a handle to differentiate the binding sites on the V2O3 surface.

Original languageBritish English
Pages (from-to)223-230
Number of pages8
JournalTopics in Catalysis
Volume46
Issue number1-2
DOIs
StatePublished - 2007

Keywords

  • Carbon monoxide
  • Catalysis
  • Photoelectron spectroscopy
  • Propane
  • Propene
  • Temperature-programmed desorption
  • Vanadium oxide

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