Catalysis on microstructured surfaces

verfasst von

Eckart Schütz, Nils Hartmann, Yannis Kevrekidis, Ronald Imbihl

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.

Organisationseinheit(en)

Institut für Physikalische Chemie und Elektrochemie

Externe Organisation(en)

Princeton University

Typ

Artikel

Journal

Faraday discussions

Band

105

Seiten

47-56

Anzahl der Seiten

10

ISSN

1359-6640

Publikationsdatum

1996

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Medizin

Elektronische Version(en)

https://doi.org/10.1039/FD9960500047 (Zugang: Geschlossen)