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

Eric 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
Pages (from-to)310-313
Number of pages4
JournalJournal of Physical Chemistry
Volume86
Issue number3
Publication statusPublished - 1982

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Thermal desorption spectroscopy
Electron energy loss spectroscopy
Carbon Monoxide
Platinum
Potassium
potassium
platinum
energy dissipation
desorption
electron energy
Adsorption
adsorption
high resolution
spectroscopy
Vibrational spectra
Carbon monoxide
carbon monoxide
Monolayers
saturation
orbitals

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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T1 - 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

AU - Garfunkel, Eric

AU - Crowell, J. E.

AU - Somorjai, G. A.

PY - 1982

Y1 - 1982

N2 - 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.

AB - 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.

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