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Local reaction kinetics by imaging.

Yuri Suchorski1, Günther Rupprechter1

  • 1Institute of Materials Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austria.

Surface Science
|February 12, 2016
PubMed
Summary
This summary is machine-generated.

Kinetics by imaging allows simultaneous local kinetic measurements on heterogeneous model systems. This method reveals spatially-resolved catalytic activity on different metal domains, aiding in understanding reaction kinetics.

Keywords:
CO oxidationCatalysisCatalytic ignitionPalladiumPhotoemission electron microscopyPlatinum

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Area of Science:

  • Surface science
  • Heterogeneous catalysis
  • Chemical kinetics

Background:

  • Understanding CO oxidation on metal surfaces is crucial for catalysis.
  • Current methods often lack spatial resolution for complex surfaces.
  • Heterogeneous model systems provide controlled environments for studying catalytic reactions.

Purpose of the Study:

  • To present an overview of recent studies using the "kinetics by imaging" approach.
  • To demonstrate the capability of correlating PEEM image intensity with local catalytic activity.
  • To enable spatially- and component-resolved kinetic studies on model catalytic systems.

Main Methods:

  • Utilizing "kinetics by imaging" approach.
  • Correlating PEEM (Photoemission Electron Microscopy) image intensity with catalytic activity.
  • Performing local kinetic measurements on μm-sized surface regions of polycrystalline metal foils.

Main Results:

  • Simultaneous local kinetic measurements on differently oriented domains.
  • Construction of local kinetic phase diagrams.
  • Direct comparison of catalytic properties of different metal domains (e.g., Pt, Pd) and supported nanoparticles.

Conclusions:

  • The "kinetics by imaging" approach provides unprecedented spatial resolution for kinetic studies.
  • This method allows detailed investigation of catalytic ignition, defect roles, and grain boundary effects.
  • It facilitates a direct comparison of the intrinsic catalytic properties of various surface domains and materials.