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Catalysis on microstructured surfaces

delete1996-01-01
delete16
PRE
AI
E
E. Schütz
N
Nils Hartmann
Y
Yannis Kevrekidis
R
R. Imbihl
DOI：10.1039/fd9960500047delete
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Abstract

Abstract

En 中文
Employing photoelectron emission microscopy (PEEM) as a spatially resolving method the catalytic reduction of NO with CO and H-2 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 + H-2 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.
Keywords:
HETEROGENEOUS CATALYSIS
PATTERN-FORMATION
CHEMICAL WAVES
NO+CO REACTION
PT(100)
OXIDATION
CO
DECOMPOSITION
OSCILLATIONS
BEHAVIOR
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Journal

Faraday Discussions cover
Faraday Discussions
IF:
3.1
Papers:
4.4K
Citations:
1.0W

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