Catalysis on microstructured surfaces

Eckart Schütz, Nils Hartmann, Yannis Kevrekidis, Ronald Imbihl

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)47-56
Number of pages10
JournalFaraday Discussions
Volume105
DOIs
StatePublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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    Schütz, E., Hartmann, N., Kevrekidis, Y., & Imbihl, R. (1996). Catalysis on microstructured surfaces. Faraday Discussions, 105, 47-56. https://doi.org/10.1039/FD9960500047