Adsorption and reactions of ethanol on Mo2C/Mo(1 0 0)

A. P. Farkas, F. Solymosi

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The adsorption, desorption and dissociation of ethanol have been investigated by work function, thermal desorption (TPD) and high resolution electron energy loss (HREELS) spectroscopic measurements on Mo2C/Mo(1 0 0). Adsorption of ethanol on this sample at 100 K led to a work function decrease suggesting that the adsorbed layer has a positive outward dipole moment By means of TPD we distinguished three adsorption states, condensed layer with a Tp = 162 K, chemisorbed ethanol with Tp = 346 K and irreversibly bonded species which decomposes to different compounds. These are hydrogen, acetaldehyde, methane, ethylene and CO. From the comparison of the Tp values with those obtained following their adsorption on Mo2C it was inferred that the desorption of methane and ethylene is reaction limited, while that of hydrogen is desorption limited process. HREEL spectra obtained at 100 K indicated that at lower exposure ethanol undergoes dissociation to give ethoxy species, whereas at high exposure molecularly adsorbed ethanol also exists on the surface. Analysis of the spectral changes in HREELS observed for annealed surface assisted to ascertain the reaction pathways of the decomposition of adsorbed ethanol.

Original languageEnglish
Pages (from-to)193-200
Number of pages8
JournalSurface Science
Volume601
Issue number1
DOIs
Publication statusPublished - Jan 1 2007

Keywords

  • Adsorption and dissociation of ethanol
  • Formation of ethoxy species
  • High resolution energy loss spectroscopy
  • MoC/Mo(1 0 0)
  • Thermal desorption spectroscopy

ASJC Scopus subject areas

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

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