Coadsorption of ethylene and potassium on Pt(111). 1. Formation of a. pi. -bonded state of ethylene
Journal Article
·
· J. Phys. Chem.; (United States)
High resolution electron energy spectroscopy (HREELS), temperature-programmed desorption (TPD), and ultraviolet photoelectron spectroscopy (UPS) have been combined to study the effect of preadsorbed potassium on the adsorption of ethylene on the platinum(111) single-crystal surface. Addition of potassium increases the relative amount of reversible ethylene adsorption at 100 K/. Upon coadsorption with potassium, the authors also observe a new low-temperature ethylene desorption state at 150 K, with E/sub d/ = 5-9 kcal mol/sup -1/, which is about one-half the binding energy of ethylene adsorbed on clean Pt(111). The origin of this new desorption state is the formation of a weakly interacting ethylene species, which is only slightly distorted from the gas-phase hybridization, as determined primarily by vibrational spectroscopy. An explanation is given for these effects in which the increased charge density at the platinum surface due to coadsorbed potassium inhibits the strong sigma-donation of adsorbed ethylene to platinum and greatly reduces the chemisorption bond strength.
- Research Organization:
- Univ. of Colorado, Boulder (USA)
- DOE Contract Number:
- FG02-86ER13473
- OSTI ID:
- 6668121
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:10; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METALS
ALKENES
CHEMICAL BONDS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
ENERGY-LOSS SPECTROSCOPY
ETHYLENE
EXCITED STATES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PLATINUM
PLATINUM METALS
POTASSIUM
RADIATIONS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
VIBRATIONAL STATES
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALKALI METALS
ALKENES
CHEMICAL BONDS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
ENERGY-LOSS SPECTROSCOPY
ETHYLENE
EXCITED STATES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PLATINUM
PLATINUM METALS
POTASSIUM
RADIATIONS
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
VIBRATIONAL STATES