Thermal decomposition of benzene on the Rh(111) crystal surface
Benzene decomposition on the Rh(111) crystal surface has been studied over the temperature range of 300-800 K by high-resolution electron energy loss spectroscopy (HREELS), temperature-programmed desorption (TPD), and low-energy electron diffraction (LEED). Our results show that benzene decomposition begins at 400 K, forming a mixture of CH and C/sub 2/H species. The relative amounts of these two species vary with temperature; at 470 K, the concentration ratio of CH to C/sub 2/H is 0.4. Above 500 K, these fragments dehydrogenate and condense to form C/sub n/H polymers. By 800 K, the adsorbed monolayer is completely dehydrogenated, forming a polymeric carbon monolayer with a vibrational spectrum similar to that of an ordered graphite monolayer. The authors propose that benzene decomposition on Rh(111) proceeds by decyclotrimerization to form three acetylenes which immediately decompose to CH and C/sub 2/H species.
- Research Organization:
- Univ. of Colorado, Boulder
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5456742
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:13; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AROMATICS
BENZENE
CATALYSIS
CATALYSTS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTALS
DATA
DECOMPOSITION
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METALS
PYROLYSIS
RHODIUM
SCATTERING
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS