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Topics in Catalysis

, Volume 24, Issue 1–4, pp 51–59 | Cite as

Oxygen States at Magnesium and Copper Surfaces Revealed by Scanning Tunneling Microscopy and Surface Reactivity

  • A.F. Carley
  • P.R. Davies
  • K.R. Harikumar
  • R.V. Jones
  • M.W. RobertsEmail author
Article

Abstract

By a combination of STM and XPS a study of the dynamics of oxygen chemisorption at Mg(0001) at 295 K has revealed oxygen states involving nucleation sites and the development of hexagonal and square lattice structures; the hexagonal structures develop epitaxially with the Mg(0001) surface. There is extensive surface mobility with, at the early stage of chemisorption, oxygen states being observed at steps at the (1×1)-O adlayer and overlapping magnesium atoms. These are active in ammonia and hydrocarbon oxidation whereas at higher oxygen coverage the surface is inactive. The dissociative chemisorption of nitric oxide generates a surface characterized by the hexagonal oxide structure; nitrogen adatoms known to be present from the N(Is) spectra are disordered. The chemisorption of hydrogen chloride at a Cu(110) surface results in a c(2×2)–Cl structure with at high coverage domains 1.8 nm wide. A sub-surface oxygen state at Cu(110), although unreactive to ammonia, undergoes a chemisorption replacement (corrosive chemisorption) reaction with HCl at 295 K.

magnesium copper scanning tunneling microscopy X-ray photoelectron spectroscopy ammonia oxidation hydrocarbons 

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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • A.F. Carley
    • 1
  • P.R. Davies
    • 1
  • K.R. Harikumar
    • 1
  • R.V. Jones
    • 1
  • M.W. Roberts
    • 1
    Email author
  1. 1.Department of ChemistryCardiff UniversityCardiffUK

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