Adsorption and dissociation of CH3OH on clean and K-promoted Pd(100) surfaces

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Abstract

The adsorption and dissociation of methanol on clean and K-dosed Pd(100) surfaces were investigated in the temperature range 90-600 K. By means of photoelectron and thermal desorption spectroscopy, condensed layer, chemisorbed and dissociated methanol were distinguished. Methanol decomposes through the formation of a methoxy species. No adsorbed CH3 was detected on clean Pd(100) in the course of heating of the adsorbed layer from 90 K to high temperatures. The cleavage of a methanolic CO bond, and the formation of a small amount of adsorbed CH3 were observed only above 300 K, but during continuous dosing of the surface with CH3OH. Additive potassium markedly increased the surface concentration of chemisorbed methanol and the formation of methoxy species, but it did not enhance the methanolic C-O bond breaking. A significant stabilization of methoxy was also experienced: its complete decomposition occurred at 450-500 K. In the discussion of the data, a direct chemical interaction between methanol and potassium and the formation of a stable KOCH3 complex are proposed.

Original languageEnglish
Pages (from-to)197-208
Number of pages12
JournalSurface Science
Volume285
Issue number3
DOIs
Publication statusPublished - Apr 10 1993

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Methanol
methyl alcohol
dissociation
Adsorption
adsorption
Potassium
potassium
Thermal desorption spectroscopy
Carbon Monoxide
Photoelectrons
cleavage
photoelectrons
Stabilization
stabilization
desorption
Decomposition
decomposition
Heating
Temperature
heating

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Adsorption and dissociation of CH3OH on clean and K-promoted Pd(100) surfaces. / Solymosi, F.; Berkó, A.; Tóth, Z.

In: Surface Science, Vol. 285, No. 3, 10.04.1993, p. 197-208.

Research output: Contribution to journalArticle

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N2 - The adsorption and dissociation of methanol on clean and K-dosed Pd(100) surfaces were investigated in the temperature range 90-600 K. By means of photoelectron and thermal desorption spectroscopy, condensed layer, chemisorbed and dissociated methanol were distinguished. Methanol decomposes through the formation of a methoxy species. No adsorbed CH3 was detected on clean Pd(100) in the course of heating of the adsorbed layer from 90 K to high temperatures. The cleavage of a methanolic CO bond, and the formation of a small amount of adsorbed CH3 were observed only above 300 K, but during continuous dosing of the surface with CH3OH. Additive potassium markedly increased the surface concentration of chemisorbed methanol and the formation of methoxy species, but it did not enhance the methanolic C-O bond breaking. A significant stabilization of methoxy was also experienced: its complete decomposition occurred at 450-500 K. In the discussion of the data, a direct chemical interaction between methanol and potassium and the formation of a stable KOCH3 complex are proposed.

AB - The adsorption and dissociation of methanol on clean and K-dosed Pd(100) surfaces were investigated in the temperature range 90-600 K. By means of photoelectron and thermal desorption spectroscopy, condensed layer, chemisorbed and dissociated methanol were distinguished. Methanol decomposes through the formation of a methoxy species. No adsorbed CH3 was detected on clean Pd(100) in the course of heating of the adsorbed layer from 90 K to high temperatures. The cleavage of a methanolic CO bond, and the formation of a small amount of adsorbed CH3 were observed only above 300 K, but during continuous dosing of the surface with CH3OH. Additive potassium markedly increased the surface concentration of chemisorbed methanol and the formation of methoxy species, but it did not enhance the methanolic C-O bond breaking. A significant stabilization of methoxy was also experienced: its complete decomposition occurred at 450-500 K. In the discussion of the data, a direct chemical interaction between methanol and potassium and the formation of a stable KOCH3 complex are proposed.

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