Benzenethiol chemistry on the Ni(111) surface: The influence of coadsorbed species
- Univ. of Michigan, Ann Arbor, MI (United States)
- Oak Ridge National Laboratory, TN (United States)
The effect of several coadsorbed species on the reactions of benzenethiol on the Ni(111) surface has been characterized. On the clean surface, benzenethiol is adsorbed as phenylthiolate with an orientation tilted form the surface normal, and hydrogenolysis to form benzene at 260 K is the primary reaction. H{sub 2} preadsorption onto the surface affects reaction selectivity at submonolayer coverages. Higher thiol coverages show no change in hydrogenolysis kinetics, either under either UHV conditions as measured by isothermal TPD or at H{sub 2} pressures up to 7X10{sup {minus}3} torr (measured by FYNES). HREELS indicates that coadsorbed hydrogen induces a change in the orientation of the phenylthiolate. Coadsorbed oxygen is shown to remove surface hydrogen by water formation and broadens the benzene desorption state. A novel reaction between coadsorbed methanethiol and benzethiol to form toluene, and the role of surface hydrogen and oxygen on this reaction, have been investigated.
- OSTI ID:
- 370656
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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