Details
| Original language | English |
|---|---|
| Pages (from-to) | 392-399 |
| Number of pages | 8 |
| Journal | Surface science |
| Volume | 401 |
| Issue number | 3 |
| Publication status | Published - 10 Apr 1998 |
Abstract
Kinetic oscillations in catalytic CO oxidation on Pt have been studied on large (millimeter size) single crystal planes of Pt as well as on a Pt field emitter tip that exposes different crystal facets of nanometer size. In order to examine the compatibility of results from the two types of experiments, the regions of different dynamical behavior (bifurcation diagram) have been mapped out in pco, T-parameter space using a field electron microscope (FEM) and a field ion microscope (FIM). The comparison with the results of single crystal measurements shows that in the case of applied electrostatic fields less than 5 V nm-1 (FEM), the field-induced effects are negligible, but they are significant for fields exceeding 12 V nm-1 (FIM). The field-induced shift of the bifurcation diagram toward lower pco values, observed with FIM, is explained in terms of a field-modified interaction of CO and O2 with Pt studied here with field ion appearance energy spectroscopy. With coadsorbed lithium (submonolayer coverage), the existence range for rate oscillations is shifted toward higher pco values. This shift is attributed to a redistribution of the electron density at the surface induced by alkali metal co-adsorption.
Keywords
- Alkali metals, Carbon monoxide, Catalysis, Field emission, Field emission microscopy, Field ion microscopy, 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. 401, No. 3, 10.04.1998, p. 392-399.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Compatibility of field emitter studies of oscillating surface reactions with single crystal measurements
T2 - Catalytic CO oxidation on Pt
AU - Suchorski, Yu
AU - Imbihl, R.
AU - Medvedev, V. K.
N1 - Funding Information: Financial support from the Deutsche Forschungsgemeinschaft is gratefully acknowledged. One of the authors (V.K.M.) was supported by INTAS-Ukraine Program (project 95-0186).
PY - 1998/4/10
Y1 - 1998/4/10
N2 - Kinetic oscillations in catalytic CO oxidation on Pt have been studied on large (millimeter size) single crystal planes of Pt as well as on a Pt field emitter tip that exposes different crystal facets of nanometer size. In order to examine the compatibility of results from the two types of experiments, the regions of different dynamical behavior (bifurcation diagram) have been mapped out in pco, T-parameter space using a field electron microscope (FEM) and a field ion microscope (FIM). The comparison with the results of single crystal measurements shows that in the case of applied electrostatic fields less than 5 V nm-1 (FEM), the field-induced effects are negligible, but they are significant for fields exceeding 12 V nm-1 (FIM). The field-induced shift of the bifurcation diagram toward lower pco values, observed with FIM, is explained in terms of a field-modified interaction of CO and O2 with Pt studied here with field ion appearance energy spectroscopy. With coadsorbed lithium (submonolayer coverage), the existence range for rate oscillations is shifted toward higher pco values. This shift is attributed to a redistribution of the electron density at the surface induced by alkali metal co-adsorption.
AB - Kinetic oscillations in catalytic CO oxidation on Pt have been studied on large (millimeter size) single crystal planes of Pt as well as on a Pt field emitter tip that exposes different crystal facets of nanometer size. In order to examine the compatibility of results from the two types of experiments, the regions of different dynamical behavior (bifurcation diagram) have been mapped out in pco, T-parameter space using a field electron microscope (FEM) and a field ion microscope (FIM). The comparison with the results of single crystal measurements shows that in the case of applied electrostatic fields less than 5 V nm-1 (FEM), the field-induced effects are negligible, but they are significant for fields exceeding 12 V nm-1 (FIM). The field-induced shift of the bifurcation diagram toward lower pco values, observed with FIM, is explained in terms of a field-modified interaction of CO and O2 with Pt studied here with field ion appearance energy spectroscopy. With coadsorbed lithium (submonolayer coverage), the existence range for rate oscillations is shifted toward higher pco values. This shift is attributed to a redistribution of the electron density at the surface induced by alkali metal co-adsorption.
KW - Alkali metals
KW - Carbon monoxide
KW - Catalysis
KW - Field emission
KW - Field emission microscopy
KW - Field ion microscopy
KW - Oxygen
KW - Platinum
KW - Surface chemical reaction
UR - http://www.scopus.com/inward/record.url?scp=0032051034&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(98)00043-0
DO - 10.1016/S0039-6028(98)00043-0
M3 - Article
AN - SCOPUS:0032051034
VL - 401
SP - 392
EP - 399
JO - Surface science
JF - Surface science
SN - 0039-6028
IS - 3
ER -