The interaction of 1-butyl iodide with the Mo2C/Mo(1 0 0) surface

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Abstract

The adsorption and dissociation of 1-butyl iodide and the reactions of butyl species have been investigated on the Mo2C/Mo(1 0 0) surface by thermal desorption spectroscopy (TDS), X-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy (HREELS) in the temperature-range of 100-1200 K. 1-Butyl iodide adsorbed molecularly on the clean Mo2C/Mo(1 0 0) surface at 100 K. A fraction of the C 4H9I(a) desorbed in two peaks at 166 and 280 K, characteristic of condensed and weakly adsorbed layers, respectively. XPS data indicated that the scission of the C-I bond in C4H9I (a) started at as low temperature as 140 K and was completed at 280-300 K. The promotion of rupture of the C-I bond in the adsorbed 1-butyl iodide was achieved by UV irradiation even at 100 K. The dissociation process was not accompanied by any significant changes in the HREEL spectra. Among the reaction products, the thermal desorption of butane was characterized by T p = 246-290 K and that of butene by Tp = 246 and 322 K, suggesting the disproportionation reaction of butyl groups. The release of both compounds was a reaction-rate limited process, as confirmed by the separate determination of their bonding to the Mo2C/Mo(1 0 0) surface. A very limited coupling of butyl species was indicated by the desorption of octane with Tp∼410 K. Heating the adsorbed layer to 470 K the formation of adsorbed butylidyne group was detected, which decomposed to carbon and hydrogen above 600 K.

Original languageEnglish
Pages (from-to)57-68
Number of pages12
JournalSurface Science
Volume561
Issue number1
DOIs
Publication statusPublished - Aug 13 2004

Fingerprint

Iodides
iodides
desorption
X ray photoelectron spectroscopy
photoelectron spectroscopy
dissociation
Thermal desorption spectroscopy
Thermal desorption
Electron energy loss spectroscopy
Butane
interactions
butenes
promotion
octanes
butanes
Butenes
Reaction products
reaction products
spectroscopy
Reaction rates

Keywords

  • Adsorption kinetics
  • Alkenes
  • Carbides
  • Chemisorption
  • Electron energy loss spectroscopy (EELS)
  • Halides
  • Molybdenum
  • Single crystal surfaces
  • Thermal desorption spectroscopy
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

The interaction of 1-butyl iodide with the Mo2C/Mo(1 0 0) surface. / Bugyi, L.; Oszkó, A.; Solymosi, F.

In: Surface Science, Vol. 561, No. 1, 13.08.2004, p. 57-68.

Research output: Contribution to journalArticle

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T1 - The interaction of 1-butyl iodide with the Mo2C/Mo(1 0 0) surface

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AU - Solymosi, F.

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N2 - The adsorption and dissociation of 1-butyl iodide and the reactions of butyl species have been investigated on the Mo2C/Mo(1 0 0) surface by thermal desorption spectroscopy (TDS), X-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy (HREELS) in the temperature-range of 100-1200 K. 1-Butyl iodide adsorbed molecularly on the clean Mo2C/Mo(1 0 0) surface at 100 K. A fraction of the C 4H9I(a) desorbed in two peaks at 166 and 280 K, characteristic of condensed and weakly adsorbed layers, respectively. XPS data indicated that the scission of the C-I bond in C4H9I (a) started at as low temperature as 140 K and was completed at 280-300 K. The promotion of rupture of the C-I bond in the adsorbed 1-butyl iodide was achieved by UV irradiation even at 100 K. The dissociation process was not accompanied by any significant changes in the HREEL spectra. Among the reaction products, the thermal desorption of butane was characterized by T p = 246-290 K and that of butene by Tp = 246 and 322 K, suggesting the disproportionation reaction of butyl groups. The release of both compounds was a reaction-rate limited process, as confirmed by the separate determination of their bonding to the Mo2C/Mo(1 0 0) surface. A very limited coupling of butyl species was indicated by the desorption of octane with Tp∼410 K. Heating the adsorbed layer to 470 K the formation of adsorbed butylidyne group was detected, which decomposed to carbon and hydrogen above 600 K.

AB - The adsorption and dissociation of 1-butyl iodide and the reactions of butyl species have been investigated on the Mo2C/Mo(1 0 0) surface by thermal desorption spectroscopy (TDS), X-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy (HREELS) in the temperature-range of 100-1200 K. 1-Butyl iodide adsorbed molecularly on the clean Mo2C/Mo(1 0 0) surface at 100 K. A fraction of the C 4H9I(a) desorbed in two peaks at 166 and 280 K, characteristic of condensed and weakly adsorbed layers, respectively. XPS data indicated that the scission of the C-I bond in C4H9I (a) started at as low temperature as 140 K and was completed at 280-300 K. The promotion of rupture of the C-I bond in the adsorbed 1-butyl iodide was achieved by UV irradiation even at 100 K. The dissociation process was not accompanied by any significant changes in the HREEL spectra. Among the reaction products, the thermal desorption of butane was characterized by T p = 246-290 K and that of butene by Tp = 246 and 322 K, suggesting the disproportionation reaction of butyl groups. The release of both compounds was a reaction-rate limited process, as confirmed by the separate determination of their bonding to the Mo2C/Mo(1 0 0) surface. A very limited coupling of butyl species was indicated by the desorption of octane with Tp∼410 K. Heating the adsorbed layer to 470 K the formation of adsorbed butylidyne group was detected, which decomposed to carbon and hydrogen above 600 K.

KW - Adsorption kinetics

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KW - Carbides

KW - Chemisorption

KW - Electron energy loss spectroscopy (EELS)

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KW - Molybdenum

KW - Single crystal surfaces

KW - Thermal desorption spectroscopy

KW - X-ray photoelectron spectroscopy

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