The strong influence of potassium on the adsorption of CO on platinum surfaces. A thermal desorption spectroscopy and high-resolution electron energy loss spectroscopy study

E. L. Garfunkel, J. E. Crowell, G. A. Somorjai

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Abstract

The chemisorptive properties of carbon monoxide on the Pt(111) crystal face were observed to change markedly in the presence of potassium. Upon deposition of half a monolayer of potassium the saturation coverage adsorption energy of CO increased from 27 to 39 kcal/mol. High-resolution electron energy loss spectroscopy (HREELS) showed a 475-cm-1 decrease in the bridge bonded CO vibrational frequency to as low as 1400 cm-1, while CO preferentially occupied bridge bonded rather than linearly bonded surface sites in the presence of potassium. These large variations appear to be caused by enhanced electron back-donation from the platinum into the 2π* antibonding orbitals of CO.

Original languageEnglish (US)
Pages (from-to)310-313
Number of pages4
JournalJournal of physical chemistry
Volume86
Issue number3
DOIs
StatePublished - Jan 1 1982
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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