Effects of potassium on the adsorption and dissociation of dimethyl ether on Rh(111)

F. Solymosi, G. Klivényi

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Abstract

The interaction of dimethyl ether (DME) with potassium-covered Rh(111) surfaces has been investigated by TDS and HREELS. Preadsorbed potassium enhanced the stability of the DME adsorbed on Rh(111) at 90 K, and induced its decomposition to give adsorbed H and CO. The loss feature of CO formed appeared at 1660 cm-1 for ΘK = 0.03, and at 1470-1500 cm-1 at ΘK = 0.12. At low K coverages, there is strong spectral evidence for the formation of methoxy species which suggests that the primary step of the dissociation is the rupture of C-O bond in the DME. Potassium influenced the reactivity of DME following its adsorption at 250 K. In contrast to the clean surface, there was no indication of the formation of CHO reaction intermediate; instead the complete decomposition of DME occurred to adsorbed H and CO.

Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalSurface Science
Volume409
Issue number2
DOIs
Publication statusPublished - Jul 1 1998

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Keywords

  • Adatoms
  • Alkali metals
  • Dimethyl ether
  • Electron energy loss spectroscopy (EELS)
  • Ethers
  • Low index single crystal surfaces
  • Rhodium
  • Thermal desorption spectroscopy
  • Vibrations of adsorbed molecules
  • Work function measurements

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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