The effect of adsorbed CO on the surface chemistry of CH3 on Rh(1 1 1)

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Abstract

The adsorption and reaction of methyl groups on clean and CO-modified Rh(111) have been studied using reflection absorption infrared spectroscopy and thermal desorption spectroscopy. It was found that co-adsorbed CO markedly stabilized CH3 on Rh(111) and increased its stability above 100K. In harmony with the stabilization effect, new high-temperature hydrogen and methane desorption states are observed. Co-adsorbed CO, however, did not influence the reaction pathway of the methyl group, dehydrogenation and hydrogenation were the dominant reaction routes. The observed CH3 stabilization is explained by site blocking and electronic effects.

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalVacuum
Volume71
Issue number1-2 SPEC.
DOIs
Publication statusPublished - May 9 2003

Keywords

  • Alkynes
  • Chemisorption
  • Rhodium
  • Surface chemical reaction
  • Thermal desorption
  • Vibration of adsorbed molecules

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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