Kinetic oscillations and surface waves in catalytic CO + O2 reaction on Pt 
surface: Field electron microscope, field ion microscope and high resolution 
electron energy loss studies

Gorodetskii, V.V; Drachsel, Wolfgang

doi:10.1016/S0926-860X(99)00212-4

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Kinetic oscillations and surface waves in catalytic CO + O₂ reaction on Pt surface: Field electron microscope, field ion microscope and high resolution electron energy loss studies

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Drachsel, Wolfgang
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Gorodetskii, V., & Drachsel, W. (1999). Kinetic oscillations and surface waves in catalytic CO + O₂ reaction on Pt surface: Field electron microscope, field ion microscope and high resolution electron energy loss studies. Applied Catalysis A: General, 188(1-2), 267-275. doi:10.1016/S0926-860X(99)00212-4.

Cite as: https://hdl.handle.net/21.11116/0000-0008-FA11-B

Abstract

Recent experimental work has shown that the field electron microscope (FEM) and the field ion microscope (FIM) can also serve as an in situ catalytic flow reactor. Platinum field emitter (model catalyst, grain diameter ∼700 Å) expose different nano single-crystal planes with well-defined crystallographic orientations. Isothermal, non-linear dynamic processes of the CO + O₂ reaction on Pt have been studied as well as the formation of face-specific adsorption islands, mobility of reaction/diffusion fronts and creation of chemical waves. Analysis of Pt surface with a local atom resolution of 4–6 Å shows the availability of a sharp boundary between the mobile COads and Oads fronts. It has been found that the back phase transition of Pt surface (100) hex ↔ 1 × 1 plays an initiating function in the generation of chemical waves along certain crystallographic orientations of Pt surface. The reaction zone maximum active in CO₂ formation, with a width of up to 40 Å, has been discovered between adsorbed CO_ads and O_ads beds. The adsorption of O₂ and the reaction of molecular O_2ads²⁻ state as well as an atomic O_ads state with CO on the Pt(100)-(hex) and the Pt(100)-(1 × 1) single crystal surface have been studied with HREELS and thermal desorption spectroscopy (TDS) techniques.