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

doi:10.1021/j100392a002

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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151 Scopus citations

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 language	English (US)
Pages (from-to)	310-313
Number of pages	4
Journal	Journal of physical chemistry
Volume	86
Issue number	3
DOIs	https://doi.org/10.1021/j100392a002
State	Published - Jan 1 1982
Externally published	Yes

All Science Journal Classification (ASJC) codes

Engineering(all)
Physical and Theoretical Chemistry

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10.1021/j100392a002

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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.",

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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, E. L.

AU - Crowell, J. E.

AU - Somorjai, G. A.

PY - 1982/1/1

Y1 - 1982/1/1

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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