Details
| Original language | English |
|---|---|
| Pages (from-to) | 29-36 |
| Number of pages | 8 |
| Journal | Surface science |
| Volume | 489 |
| Issue number | 1-3 |
| Publication status | Published - 20 Aug 2001 |
Abstract
We present a lattice-gas-type model which accounts for short-range correlations between coadsorbates to describe analytically the alkali-modified CO oxidation reaction on a transition metal surface. The effect of the adsorbed alkali near the surface is described in terms of long-range fields which change the binding energies of adsorbed CO and oxygen, and of the coadsorption-modified sticking coefficients. An decrease of the binding energy of CO in chemisorbed state which provides an increase of oxygen coverage on the surface and an alkali-induced delocalization of adsorbed CO accompanied by a lowering of the CO coverage is predicted. As net result the reactive state (oxygen covered surface) is enlarged towards higher pCO pressures in agreement with the experimentally obtained phase diagrams (pCO, 1/T).
Keywords
- Alkali metals, Carbon monoxide, Catalysis, Oxidation, Oxygen, Platinum, Surface chemical reaction
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Surface science, Vol. 489, No. 1-3, 20.08.2001, p. 29-36.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Alkali metal effect on catalytic CO oxidation on a transition metal surface
T2 - A lattice-gas model
AU - Pavlenko, N.
AU - Kostrobij, P. P.
AU - Suchorski, Yu
AU - Imbihl, R.
N1 - Funding Information: This work was supported by INTAS (UA-I95-0186). The authors thank Professor Jim Evans for his valuable comments. N.P. appreciates the financial support by Alexander von Humboldt Foundation.
PY - 2001/8/20
Y1 - 2001/8/20
N2 - We present a lattice-gas-type model which accounts for short-range correlations between coadsorbates to describe analytically the alkali-modified CO oxidation reaction on a transition metal surface. The effect of the adsorbed alkali near the surface is described in terms of long-range fields which change the binding energies of adsorbed CO and oxygen, and of the coadsorption-modified sticking coefficients. An decrease of the binding energy of CO in chemisorbed state which provides an increase of oxygen coverage on the surface and an alkali-induced delocalization of adsorbed CO accompanied by a lowering of the CO coverage is predicted. As net result the reactive state (oxygen covered surface) is enlarged towards higher pCO pressures in agreement with the experimentally obtained phase diagrams (pCO, 1/T).
AB - We present a lattice-gas-type model which accounts for short-range correlations between coadsorbates to describe analytically the alkali-modified CO oxidation reaction on a transition metal surface. The effect of the adsorbed alkali near the surface is described in terms of long-range fields which change the binding energies of adsorbed CO and oxygen, and of the coadsorption-modified sticking coefficients. An decrease of the binding energy of CO in chemisorbed state which provides an increase of oxygen coverage on the surface and an alkali-induced delocalization of adsorbed CO accompanied by a lowering of the CO coverage is predicted. As net result the reactive state (oxygen covered surface) is enlarged towards higher pCO pressures in agreement with the experimentally obtained phase diagrams (pCO, 1/T).
KW - Alkali metals
KW - Carbon monoxide
KW - Catalysis
KW - Oxidation
KW - Oxygen
KW - Platinum
KW - Surface chemical reaction
UR - http://www.scopus.com/inward/record.url?scp=0035921012&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(01)01180-3
DO - 10.1016/S0039-6028(01)01180-3
M3 - Article
AN - SCOPUS:0035921012
VL - 489
SP - 29
EP - 36
JO - Surface science
JF - Surface science
SN - 0039-6028
IS - 1-3
ER -