Adsorption and reaction of methyl and ethyl iodide on potassium-promoted Mo2C/Mo(100) surface

A. P. Farkas, Á Koós, L. Bugyi, F. Solymosi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

X-ray photoelectron spectroscopy (XPS) studies revealed that potassium on Mo2C/Mo(100) induced cleavage of the C-I bond in adsorbed CH 3I even at ∼ 100 K. The temperature of complete C-I bond breaking occurred 60-80 K lower compared to the clean surface. Preadsorbed potassium also influenced the reaction pathway of adsorbed CH3 formed. It decreased its self-hydrogenation into methane and facilitated the coupling reactions into ethane and ethylene below 200 K. High-resolution electron energy loss spectroscopy (HREELS) confirmed formation of adsorbed CH3 species and revealed its thermal stability. Potassium exerted a similar influence on the chemistry of C2H5I on Mo 2C/Mo(100) surface. Rupture of the C-I bond also occurred more easily on K-covered surface. Ethyl species, the primary product of the dissociation, dehydrogenated into ethylene on one hand and hydrogenated into ethane on the other. Rupture of the C-C bond was not observed even at high potassium coverage. Illumination of coadsorbed layers promoted further dissociation of the C-I bond in both compounds at ∼100 K.

Original languageEnglish
Pages (from-to)18502-18509
Number of pages8
JournalJournal of Physical Chemistry C
Volume112
Issue number47
DOIs
Publication statusPublished - Nov 27 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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