Adsorption of HCOOH on Rh(111) and its reaction with preadsorbed oxygen

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Abstract

The interaction of formic acid with clean and oxygen-dosed Rh(111) surfaces has been investigated by electron energy loss (in the electronic range), thermal desorption and photoelec-tron spectroscopy. Formic acid adsorbs readily on the Rh(111) surface at 100 K with a high sticking probability. Three adsorbed states have been distinguished: a condensed layer (Tp=170 K), a chemisorbed layer (Tp = 202 K) and the formation of formate species. The latter is stable up to 200 K, but decomposes completely at 200–250 K. The major products are: H2 (Tp = 323 K) and CO2 (Tp = 255–290 K), but H2O (Tp = 263 K) and CO (Tp = 530 K) are also formed. Preadsorbed oxygen exerted a readily observable influence on the interaction of HCOOH with the Rh(111) surface. It increased the extent of dissociation of HCOOH and extended the region of stability of surface formate by at least 80–100 K. This was demonstrated by higher stability of photoemission peaks due to formate and by simultaneous production of CO2 and H2O with Tp = 377–385 K at saturation oxygen coverage.

Original languageEnglish
Pages (from-to)47-65
Number of pages19
JournalSurface Science
Volume192
Issue number1
DOIs
Publication statusPublished - 1987

ASJC Scopus subject areas

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

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