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

Journal Article · Thu Feb 04 04:00:00 UTC 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100392a002· OSTI ID:5680208

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

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/sup -1/ decrease in the bridge bonded CO vibrational frequency to as low as 1400 cm/sup -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 2..pi..* antibonding orbitals of CO.

• Research Organization: Lawrence Berkeley Lab., CA
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5680208
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:3; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METALS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LOSSES
EXPERIMENTAL DATA
INFORMATION
LOSSES
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
POTASSIUM
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS