Adsorption and oxidation of C2N2 on clean and oxygen dosed Rh(111) surfaces

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Abstract

The interaction of C2N2 with Rh surfaces has been investigated by LEED, Auger electron, electron energy loss (in the electronic range) and thermal desorption spectroscopy. The adsorption of C2N2 on a clean Rh(111) surface at 300 K did not give rise to any new LEED pattern. By means of thermal desorption measurements four adsorption states were distinguished at saturation; at 380 K (α), 610 K (β1), 680 K (β2) and 740 K (γ). The weakly bound α state is attributed to non-dissociatively adsorbed C2N2, while the β and γ states are ascribed to the associative desorption of pairs of CN radicals formed in the surface dissociation of C2N2. At the same time, N2 also desorbed, at Tp = 800 and 850 K, indicating that fission of the C-N bond occurred on the Rh(111) surface. In the presence of adsorbed oxygen the rate and the extent of C2N2 adsorption are decreased. The oxidation of adsorbed CN groups starts above 360 K, to yield gaseous CO2 and adsorbed CO and N. From the EELS results it is proposed that the oxidation of cyanide occurs through the formation and further oxidation of an NCO surface intermediate.

Original languageEnglish
Pages (from-to)685-701
Number of pages17
JournalSurface Science
Volume147
Issue number2-3
DOIs
Publication statusPublished - Nov 3 1984

ASJC Scopus subject areas

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

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