Adsorption and reaction of HCOOH on K-promoted Pd(100) surfaces

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The adsorption and reaction of formic acid on clean and K-promoted Pd(100) surfaces have been studied with thermal desorption mass spectrometry (TDS), electron energy loss spectroscopy (EELS), ultraviolet photoelectron spectroscopy (UPS) and work function change. Formic acid adsorbs molecularly on a clean Pd(100) at 90-100 K, and decomposes below 200 K to give CO and H2. No spectroscopic evidence was found for the intermediate formation of formate. Preadsorbed potassium increased the uptake of formic acid, it altered the product distribution of the surface decomposition and it induced the formation of formate species. It is assumed that formic acid interacts directly with potassium adatoms to give a stable HCOOK like species which decomposes completely only above 400 K. The products of the decomposition, CO, CO2 and H2 are strongly stabilized by potassium.

Original languageEnglish
Pages (from-to)95-108
Number of pages14
JournalSurface Science
Issue number1-2
Publication statusPublished - Dec 1 1991

ASJC Scopus subject areas

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

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