Adsorption and dissociation of dimethyl ether on clean and oxygen-dosed Rh(111)

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The interaction of dimethyl ether (DME) with clean and oxygen-covered Rh(111) surfaces has been investigated by TDS and HREELS. The adsorption of DME on the clean Rh(111) surface was reversible at 100 K; all the adsorbed DME was released to the gas phase after annealing without any sign of decomposition. On increasing the adsorption temperature to 250-300 K, the appearance of an intense HREELS feature at 1230 cm-1 indicated that a reaction channel opened up for the thermally activated decomposition of DME. The reaction intermediate of this process was tentatively identified as CHO or CHxOCHx(a) species, the decomposition of which resulted in adsorbed CO and hydrogen. On the O-precovered Rh(111) surface, a fraction of DME was stabilised in a state characterized by Tp=245 K. On the other hand, the interaction of DME with adsorbed O led to the formation of CH3O(a) species at 100-195 K. Above 250 K, this species is decomposed and oxidized, leading to the evolution of H2O and CO2.

Original languageEnglish
Pages (from-to)365-375
Number of pages11
JournalSurface Science
Volume385
Issue number2-3
Publication statusPublished - Aug 10 1997

Fingerprint

Ethers
ethers
dissociation
Oxygen
Adsorption
adsorption
oxygen
Decomposition
decomposition
Reaction intermediates
reaction intermediates
Carbon Monoxide
dimethyl ether
Hydrogen
Gases
interactions
Annealing
vapor phases
annealing
hydrogen

Keywords

  • Adsorption kinetics
  • Catalysis
  • Electron energy loss spectroscopy
  • Ethers
  • Low index single crystal surfaces
  • Oxidation
  • Rhodium
  • Thermal desorption spectroscopy

ASJC Scopus subject areas

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

Cite this

Adsorption and dissociation of dimethyl ether on clean and oxygen-dosed Rh(111). / Bugyi, L.; Solymosi, F.

In: Surface Science, Vol. 385, No. 2-3, 10.08.1997, p. 365-375.

Research output: Contribution to journalArticle

@article{a3861721ec15471fb07e47136a688ca3,
title = "Adsorption and dissociation of dimethyl ether on clean and oxygen-dosed Rh(111)",
abstract = "The interaction of dimethyl ether (DME) with clean and oxygen-covered Rh(111) surfaces has been investigated by TDS and HREELS. The adsorption of DME on the clean Rh(111) surface was reversible at 100 K; all the adsorbed DME was released to the gas phase after annealing without any sign of decomposition. On increasing the adsorption temperature to 250-300 K, the appearance of an intense HREELS feature at 1230 cm-1 indicated that a reaction channel opened up for the thermally activated decomposition of DME. The reaction intermediate of this process was tentatively identified as CHO or CHxOCHx(a) species, the decomposition of which resulted in adsorbed CO and hydrogen. On the O-precovered Rh(111) surface, a fraction of DME was stabilised in a state characterized by Tp=245 K. On the other hand, the interaction of DME with adsorbed O led to the formation of CH3O(a) species at 100-195 K. Above 250 K, this species is decomposed and oxidized, leading to the evolution of H2O and CO2.",
keywords = "Adsorption kinetics, Catalysis, Electron energy loss spectroscopy, Ethers, Low index single crystal surfaces, Oxidation, Rhodium, Thermal desorption spectroscopy",
author = "L. Bugyi and F. Solymosi",
year = "1997",
month = "8",
day = "10",
language = "English",
volume = "385",
pages = "365--375",
journal = "Surface Science",
issn = "0039-6028",
publisher = "Elsevier",
number = "2-3",

}

TY - JOUR

T1 - Adsorption and dissociation of dimethyl ether on clean and oxygen-dosed Rh(111)

AU - Bugyi, L.

AU - Solymosi, F.

PY - 1997/8/10

Y1 - 1997/8/10

N2 - The interaction of dimethyl ether (DME) with clean and oxygen-covered Rh(111) surfaces has been investigated by TDS and HREELS. The adsorption of DME on the clean Rh(111) surface was reversible at 100 K; all the adsorbed DME was released to the gas phase after annealing without any sign of decomposition. On increasing the adsorption temperature to 250-300 K, the appearance of an intense HREELS feature at 1230 cm-1 indicated that a reaction channel opened up for the thermally activated decomposition of DME. The reaction intermediate of this process was tentatively identified as CHO or CHxOCHx(a) species, the decomposition of which resulted in adsorbed CO and hydrogen. On the O-precovered Rh(111) surface, a fraction of DME was stabilised in a state characterized by Tp=245 K. On the other hand, the interaction of DME with adsorbed O led to the formation of CH3O(a) species at 100-195 K. Above 250 K, this species is decomposed and oxidized, leading to the evolution of H2O and CO2.

AB - The interaction of dimethyl ether (DME) with clean and oxygen-covered Rh(111) surfaces has been investigated by TDS and HREELS. The adsorption of DME on the clean Rh(111) surface was reversible at 100 K; all the adsorbed DME was released to the gas phase after annealing without any sign of decomposition. On increasing the adsorption temperature to 250-300 K, the appearance of an intense HREELS feature at 1230 cm-1 indicated that a reaction channel opened up for the thermally activated decomposition of DME. The reaction intermediate of this process was tentatively identified as CHO or CHxOCHx(a) species, the decomposition of which resulted in adsorbed CO and hydrogen. On the O-precovered Rh(111) surface, a fraction of DME was stabilised in a state characterized by Tp=245 K. On the other hand, the interaction of DME with adsorbed O led to the formation of CH3O(a) species at 100-195 K. Above 250 K, this species is decomposed and oxidized, leading to the evolution of H2O and CO2.

KW - Adsorption kinetics

KW - Catalysis

KW - Electron energy loss spectroscopy

KW - Ethers

KW - Low index single crystal surfaces

KW - Oxidation

KW - Rhodium

KW - Thermal desorption spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=0031200150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031200150&partnerID=8YFLogxK

M3 - Article

VL - 385

SP - 365

EP - 375

JO - Surface Science

JF - Surface Science

SN - 0039-6028

IS - 2-3

ER -