Spatially coupled catalytic ignition of CO oxidation on Pt: mesoscopic versus nano-scale

C Spiel; D Vogel; R Schlögl; G Rupprechter; Y Suchorski

doi:10.1016/j.ultramic.2015.05.012

Spatially coupled catalytic ignition of CO oxidation on Pt: mesoscopic versus nano-scale

Ultramicroscopy. 2015 Dec:159 Pt 2:178-83. doi: 10.1016/j.ultramic.2015.05.012. Epub 2015 May 14.

Authors

C Spiel¹, D Vogel², R Schlögl³, G Rupprechter¹, Y Suchorski⁴

Affiliations

¹ Institute of Materials Chemistry, Vienna University of Technology, 1060 Vienna, Austria.
² Institute of Materials Chemistry, Vienna University of Technology, 1060 Vienna, Austria; Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, 14195 Berlin, Germany.
³ Department of Inorganic Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, 14195 Berlin, Germany.
⁴ Institute of Materials Chemistry, Vienna University of Technology, 1060 Vienna, Austria. Electronic address: yuri.suchorski@tuwien.ac.at.

Abstract

Spatial coupling during catalytic ignition of CO oxidation on μm-sized Pt(hkl) domains of a polycrystalline Pt foil has been studied in situ by PEEM (photoemission electron microscopy) in the 10(-5) mbar pressure range. The same reaction has been examined under similar conditions by FIM (field ion microscopy) on nm-sized Pt(hkl) facets of a Pt nanotip. Proper orthogonal decomposition (POD) of the digitized FIM images has been employed to analyze spatiotemporal dynamics of catalytic ignition. The results show the essential role of the sample size and of the morphology of the domain (facet) boundary in the spatial coupling in CO oxidation.

Keywords: CO oxidation; Catalytic reactions; Field ion microscopy; Photoemission electron microscopy.

Publication types

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