Catalytic CO oxidation on Pt under near ambient pressure: A NAP-LEEM study

Torsten Franz; Bernhard von Boehn; Helder Marchetto; Benjamin Borkenhagen; Gerhard Lilienkamp; Winfried Daum; Ronald Imbihl

doi:10.1016/j.ultramic.2019.02.024

Catalytic CO oxidation on Pt under near ambient pressure: A NAP-LEEM study

Ultramicroscopy. 2019 May:200:73-78. doi: 10.1016/j.ultramic.2019.02.024. Epub 2019 Feb 27.

Authors

Torsten Franz¹, Bernhard von Boehn², Helder Marchetto³, Benjamin Borkenhagen⁴, Gerhard Lilienkamp⁴, Winfried Daum⁴, Ronald Imbihl⁵

Affiliations

¹ Elmitec Elektronenmikroskopie GmbH, Albrecht-von-Groddeck-Straße 3, 38678 Clausthal-Zellerfeld, Germany.
² Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstrasse 3A, 30167 Hannover, Germany. Electronic address: bernhard.vonboehn@pci.uni-hannover.de.
³ Elmitec Elektronenmikroskopie GmbH, Albrecht-von-Groddeck-Straße 3, 38678 Clausthal-Zellerfeld, Germany; Department of Chemical Physics, Fritz-Haber Institute of the Max-Planck Society, Berlin, Germany.
⁴ Institute of Energy Research and Physical Technologies, Technische Universität Clausthal, Leibnizstrasse 4, 38678 Clausthal-Zellerfeld, Germany.
⁵ Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstrasse 3A, 30167 Hannover, Germany.

PMID: 30836286
DOI: 10.1016/j.ultramic.2019.02.024

Abstract

A near ambient pressure low-energy electron microscope (NAP-LEEM) has recently been constructed, that allows in situ imaging of surfaces up to a pressure of 10^-1 mbar. Here we report on pattern formation in catalytic CO oxidation on a Pt(110) single crystal surface and on a polycrystalline Pt foil in the 10^-2 mbar range, operating the microscope in the mirror electron microscopy (MEM) and in the LEEM mode. Excitations localized at structural defects and spiral wave fragments have been observed.

Keywords: CO oxidation; NAP-LEEM; Near ambient pressure low-energy electron microscopy; Platinum.

Publication types

Research Support, Non-U.S. Gov't