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Pattern formation during the CO-oxidation involving subsurface oxygen.

Harm Hinrich Rotermund¹, Michael Pollmann, Ioannis G. Kevrekidis

¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, GermanyDepartment of Chemical Engineering, Princeton University, Princeton, New Jersey 08544.

Chaos (Woodbury, N.Y.)

|June 5, 2003

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Subsurface oxygen significantly influences pattern formation in carbon monoxide-oxidation on platinum surfaces. This study reviews its role and presents new findings on its interaction with chemisorbed oxygen on Pt(110).

Area of Science:

Surface science
Chemical kinetics
Materials science

Background:

Subsurface oxygen, an atomic O species beneath the metal surface, lowers work function.
Its presence is established on palladium during rate oscillations.
Subsurface oxygen's role in platinum catalysis is under investigation.

Purpose of the Study:

To review the influence of subsurface oxygen on pattern formation during CO-oxidation on platinum.
To present new findings on subsurface oxygen interactions with chemisorbed oxygen on Pt(110).

Main Methods:

Photoelectron Emission Microscope (PEEM) for real-time imaging of spatiotemporal patterns.
Observation of local work function changes.
Utilizing microlithographically constructed domain boundaries (Rh or Pd) on Pt(110).

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Main Results:

Subsurface oxygen plays a critical role in pattern formation during CO-oxidation on platinum.
New results show interactions between subsurface oxygen and chemisorbed oxygen on Pt(110).
Domain boundaries act as additional CO sources, influencing surface reactions.

Conclusions:

Subsurface oxygen is a key factor in CO-oxidation pattern formation on platinum.
The interaction of subsurface oxygen with chemisorbed oxygen is significant under specific boundary conditions.
Further research into subsurface oxygen's catalytic role is warranted.