Details
| Original language | English |
|---|---|
| Pages (from-to) | 47-56 |
| Number of pages | 10 |
| Journal | Faraday discussions |
| Volume | 105 |
| Publication status | Published - 1996 |
Abstract
Employing photoelectron emission microscopy (PEEM) as a spatially resolving method the catalytic reduction of NO with CO and H2 has been investigated on microstructured composite surfaces in the 10-6 and 10-5 mbar range. By deposition of Ti and Rh onto a Pt(100) surface, domains of varying size and geometry are created in which the Pt is either surrounded by an inert Ti/TiO2 layer or by a reactive Rh layer. For the NO + CO reaction the behaviour of pulses in circular and ring-shaped geometries is studied. It is shown that the pattern forming properties of the Pt(100) substrate are significantly altered by size restrictions. In the NO + H2 reaction, which was investigated on Pt(100)/Rh microstructures, a strong diffusional coupling between the two metallic substrates occurs. This strong coupling presumably originates from highly mobile adsorbed hydrogen. Pattern formation and front nucleation take place preferentially at the Pt/Rh interface thus suggesting that this region exhibits a particularly high catalytic activity.
ASJC Scopus subject areas
- Medicine(all)
- General Medicine
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In: Faraday discussions, Vol. 105, 1996, p. 47-56.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Catalysis on microstructured surfaces
AU - Schütz, Eckart
AU - Hartmann, Nils
AU - Kevrekidis, Yannis
AU - Imbihl, Ronald
PY - 1996
Y1 - 1996
N2 - Employing photoelectron emission microscopy (PEEM) as a spatially resolving method the catalytic reduction of NO with CO and H2 has been investigated on microstructured composite surfaces in the 10-6 and 10-5 mbar range. By deposition of Ti and Rh onto a Pt(100) surface, domains of varying size and geometry are created in which the Pt is either surrounded by an inert Ti/TiO2 layer or by a reactive Rh layer. For the NO + CO reaction the behaviour of pulses in circular and ring-shaped geometries is studied. It is shown that the pattern forming properties of the Pt(100) substrate are significantly altered by size restrictions. In the NO + H2 reaction, which was investigated on Pt(100)/Rh microstructures, a strong diffusional coupling between the two metallic substrates occurs. This strong coupling presumably originates from highly mobile adsorbed hydrogen. Pattern formation and front nucleation take place preferentially at the Pt/Rh interface thus suggesting that this region exhibits a particularly high catalytic activity.
AB - Employing photoelectron emission microscopy (PEEM) as a spatially resolving method the catalytic reduction of NO with CO and H2 has been investigated on microstructured composite surfaces in the 10-6 and 10-5 mbar range. By deposition of Ti and Rh onto a Pt(100) surface, domains of varying size and geometry are created in which the Pt is either surrounded by an inert Ti/TiO2 layer or by a reactive Rh layer. For the NO + CO reaction the behaviour of pulses in circular and ring-shaped geometries is studied. It is shown that the pattern forming properties of the Pt(100) substrate are significantly altered by size restrictions. In the NO + H2 reaction, which was investigated on Pt(100)/Rh microstructures, a strong diffusional coupling between the two metallic substrates occurs. This strong coupling presumably originates from highly mobile adsorbed hydrogen. Pattern formation and front nucleation take place preferentially at the Pt/Rh interface thus suggesting that this region exhibits a particularly high catalytic activity.
UR - http://www.scopus.com/inward/record.url?scp=2542530661&partnerID=8YFLogxK
U2 - 10.1039/FD9960500047
DO - 10.1039/FD9960500047
M3 - Article
AN - SCOPUS:2542530661
VL - 105
SP - 47
EP - 56
JO - Faraday discussions
JF - Faraday discussions
SN - 1359-6640
ER -