Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111)
F. Solymosi, A. Berkó, Tibor I. Tarnóczi
The interaction of methanol with potassium-dosed (up to monolayer) Rh(111) surface has been studied by means of thermal desorption, ultraviolet photoemission (He II) spectroscopy and work function measurements. Preadsorbed potassium significantly influenced the adsorption, desorption, and stability of CH3OH on this Rh surface, but the pathway of the dissociation of CH3OH and its surface decomposition were not altered. An increase (6-10 kJ/mol) in the binding energy of chemisorbed CH3OH was found even in the low potassium coverage range, θK=0.05-0.26. At higher potassium coverages (θK=0.36, monolayer), where K exhibits mainly metallic character, the relative amount of irreversibly adsorbed methanol was greatly increased. In this case methoxy species was detected by He II photoemission studies: its complete decomposition occurred at around 492-505 K. The stabilization of the methoxy species was reflected in the high temperature for the evolution of H2(Tp=515 K), too. In the interpretation of the data a direct chemical interaction between methanol and potassium and the formation of a stable potassium methoxide is proposed.
The Journal of Chemical Physics
Photoemission
photoelectric emission
desorption
Monolayers
Solymosi, F., Berkó, A., & Tarnóczi, T. I. (1987). Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111). The Journal of Chemical Physics, 87(11), 6745-6753.
Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111). / Solymosi, F.; Berkó, A.; Tarnóczi, Tibor I.
In: The Journal of Chemical Physics, Vol. 87, No. 11, 1987, p. 6745-6753.
Solymosi, F, Berkó, A & Tarnóczi, TI 1987, 'Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111)', The Journal of Chemical Physics, vol. 87, no. 11, pp. 6745-6753.
Solymosi F, Berkó A, Tarnóczi TI. Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111). The Journal of Chemical Physics. 1987;87(11):6745-6753.
Solymosi, F. ; Berkó, A. ; Tarnóczi, Tibor I. / Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111). In: The Journal of Chemical Physics. 1987 ; Vol. 87, No. 11. pp. 6745-6753.
@article{41e0a09b7d4848e9b6df0c8d768214de,
title = "Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111)",
abstract = "The interaction of methanol with potassium-dosed (up to monolayer) Rh(111) surface has been studied by means of thermal desorption, ultraviolet photoemission (He II) spectroscopy and work function measurements. Preadsorbed potassium significantly influenced the adsorption, desorption, and stability of CH3OH on this Rh surface, but the pathway of the dissociation of CH3OH and its surface decomposition were not altered. An increase (6-10 kJ/mol) in the binding energy of chemisorbed CH3OH was found even in the low potassium coverage range, θK=0.05-0.26. At higher potassium coverages (θK=0.36, monolayer), where K exhibits mainly metallic character, the relative amount of irreversibly adsorbed methanol was greatly increased. In this case methoxy species was detected by He II photoemission studies: its complete decomposition occurred at around 492-505 K. The stabilization of the methoxy species was reflected in the high temperature for the evolution of H2(Tp=515 K), too. In the interpretation of the data a direct chemical interaction between methanol and potassium and the formation of a stable potassium methoxide is proposed.",
author = "F. Solymosi and A. Berk{\'o} and Tarn{\'o}czi, {Tibor I.}",
journal = "Journal of Chemical Physics",
publisher = "American Institute of Physics Publising LLC",
T1 - Ultraviolet photoemission and thermal desorption studies of the chemisorption and decomposition of methanol on potassium-dosed Rh(111)
AU - Solymosi, F.
AU - Berkó, A.
AU - Tarnóczi, Tibor I.
N2 - The interaction of methanol with potassium-dosed (up to monolayer) Rh(111) surface has been studied by means of thermal desorption, ultraviolet photoemission (He II) spectroscopy and work function measurements. Preadsorbed potassium significantly influenced the adsorption, desorption, and stability of CH3OH on this Rh surface, but the pathway of the dissociation of CH3OH and its surface decomposition were not altered. An increase (6-10 kJ/mol) in the binding energy of chemisorbed CH3OH was found even in the low potassium coverage range, θK=0.05-0.26. At higher potassium coverages (θK=0.36, monolayer), where K exhibits mainly metallic character, the relative amount of irreversibly adsorbed methanol was greatly increased. In this case methoxy species was detected by He II photoemission studies: its complete decomposition occurred at around 492-505 K. The stabilization of the methoxy species was reflected in the high temperature for the evolution of H2(Tp=515 K), too. In the interpretation of the data a direct chemical interaction between methanol and potassium and the formation of a stable potassium methoxide is proposed.
AB - The interaction of methanol with potassium-dosed (up to monolayer) Rh(111) surface has been studied by means of thermal desorption, ultraviolet photoemission (He II) spectroscopy and work function measurements. Preadsorbed potassium significantly influenced the adsorption, desorption, and stability of CH3OH on this Rh surface, but the pathway of the dissociation of CH3OH and its surface decomposition were not altered. An increase (6-10 kJ/mol) in the binding energy of chemisorbed CH3OH was found even in the low potassium coverage range, θK=0.05-0.26. At higher potassium coverages (θK=0.36, monolayer), where K exhibits mainly metallic character, the relative amount of irreversibly adsorbed methanol was greatly increased. In this case methoxy species was detected by He II photoemission studies: its complete decomposition occurred at around 492-505 K. The stabilization of the methoxy species was reflected in the high temperature for the evolution of H2(Tp=515 K), too. In the interpretation of the data a direct chemical interaction between methanol and potassium and the formation of a stable potassium methoxide is proposed.
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics