Platinum surface chemistry studied by thermal desorption spectrometry and near edge x-ray absorption fine structure: adsorbate effects
The surface chemistry of hydrocarbons, particularly aromatic hydrocarbons, adsorbed on Pt(111) was investigated by Thermal Desorption Spectrometry (TDS) and Near Edge X-ray Absorption Fine Structure (NEXAFS). The utility of NEXAFS in the investigation of reactive systems of molecules of moderate complexity is demonstrated. Benzene chemisorption was studied as a function of temperature. Below the decomposition temperature benzene is parallel to the surface and ..pi.. coordinated. The fluorinated benzenes were investigated to determine the effects of shifts in energy of the HOMO and LUMO levels of the adsorbate on the chemisorption energy. The C/sub 4/ through C/sub 8/ cyclic unsaturated hydrocarbons were investigated to determine the effects of aromaticity on chemisorption. Diatomics and pseudo diatomics were studied to determine under which conditions they might be oriented parallel (e.g., ethylene) or normal (e.g., CO) to the surface. A novel electron induced decomposition of acetonitrile is reported and a mechanism is proposed. Finally, the future of NEXAFS is discussed and extensions to the present work suggested. 93 refs., 63 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6400824
- Report Number(s):
- LBL-20964; ON: DE86007424
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ABSORPTION SPECTROSCOPY
ACETONITRILE
ACETYLENE
ACTIVATION ENERGY
ALKENES
ALKYNES
AROMATICS
AZINES
BENZENE
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CYCLOALKENES
DATA
ELEMENTS
ENERGY
ETHYLENE
EXPERIMENTAL DATA
FLUORINATED AROMATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
KINETICS
METALS
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PYRIDINES
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
THIOPHENE
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY