Oscillating Catalytic CO Oxidation on a Platinum Field Emitter Tip: 
Determination of a Reactive Phase Diagram by Field Electron Microscopy

Lim, Yong-Sung; Berdau, Martin; Naschitzki, Matthias; Ehsasi, Mohammad; Block, Jochen H.

doi:10.1006/jcat.1994.1297

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Oscillating Catalytic CO Oxidation on a Platinum Field Emitter Tip: Determination of a Reactive Phase Diagram by Field Electron Microscopy

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Lim, Yong-Sung
Fritz Haber Institute, Max Planck Society;

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Berdau, Martin
Fritz Haber Institute, Max Planck Society;

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Naschitzki, Matthias
Fritz Haber Institute, Max Planck Society;

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Ehsasi, Mohammad
Fritz Haber Institute, Max Planck Society;

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Block, Jochen H.
Fritz Haber Institute, Max Planck Society;

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Citation

Lim, Y.-S., Berdau, M., Naschitzki, M., Ehsasi, M., & Block, J. H. (1994). Oscillating Catalytic CO Oxidation on a Platinum Field Emitter Tip: Determination of a Reactive Phase Diagram by Field Electron Microscopy. Journal of Catalysis, 149(2), 292-299. doi:10.1006/jcat.1994.1297.

Cite as: https://hdl.handle.net/21.11116/0000-0009-8E79-0

Abstract

A [111]-oriented Pt field emitter tip is used to study bistability and oscillations of CO oxidation by field electron microscopy (FEM) under low-pressure conditions (pO₂ = 4 × 10⁻⁴ Torr, p_CO = 8 × 10⁻⁸ to 4 × 10⁻⁵ Torr) in the temperature range 240 to 450 K. A kinetic phase diagram can be established, obtained on an FEM level with ≍2 nm lateral resolution. Below T ≍ 300 K a region of bistability prevails, and above T ≍ 300 K an oscillatory regime is obtained, thus yielding a cross-shaped phase diagram. These phenomena are surface plane specific and visible at the {011} planes of Pt and their surroundings.