Catalysis on microstructured surfaces

Eckart Schütz; Nils Hartmann; Yannis Kevrekidis; Ronald Imbihl

doi:10.1039/FD9960500047

Catalysis on microstructured surfaces

Eckart Schütz, Nils Hartmann, Yannis Kevrekidis, Ronald Imbihl

Chemical & Biological Engineering

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14 Scopus citations

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.

Original language	English (US)
Pages (from-to)	47-56
Number of pages	10
Journal	Faraday Discussions
Volume	105
DOIs	https://doi.org/10.1039/FD9960500047
State	Published - 1996

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

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10.1039/FD9960500047

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title = "Catalysis on microstructured surfaces",

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.",

author = "Eckart Sch{\"u}tz and Nils Hartmann and Yannis Kevrekidis and Ronald Imbihl",

year = "1996",

doi = "10.1039/FD9960500047",

language = "English (US)",

volume = "105",

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journal = "Faraday Discussions",

issn = "1359-6640",

publisher = "Royal Society of Chemistry",

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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.

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JO - Faraday Discussions

JF - Faraday Discussions

ER -

Catalysis on microstructured surfaces

Abstract

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