Strain Dependent Light-off Temperature in Catalysis Revealed by Planar Laser-Induced Fluorescence

Research output: Contribution to journalArticle

Abstract

Understanding how specific atom sites on metal surfaces lower the energy barrier for chemical reactions is vital in catalysis. Studies on simplified model systems have shown that atoms arranged as steps on the surface play an important role in catalytic reactions, but a direct comparison of how the light-off temperature is affected by the atom orientation on the step has not yet been possible due to methodological constraints. Here we report in situ spatially resolved measurements of the CO2 production over a cylindrical-shaped Pd catalyst and show that the light-off temperature at different parts of the crystal depends on the step orientation of the two types of steps (named A and B). Our finding is supported by density functional theory calculations, revealing that the steps, in contrast to what has been previously reported in the literature, are not directly involved in the reaction onset but have the role of releasing stress.

Details

Authors
Organisations
External organisations
  • Chalmers University of Technology
  • Donostia International Physics Center (DIPC)
  • University of the Basque Country
  • CSIC Centro de Física de Materiales (UPV/EHU)
  • German Electron Synchrotron (DESY)
Research areas and keywords

Keywords

  • CO oxidation, cylindrical crystal, density functional theory, planar laser-induced fluorescence, steps
Original languageEnglish
Pages (from-to)110-114
Number of pages5
JournalACS Catalysis
Volume7
Issue number1
Publication statusPublished - 2017 Jan 6
Publication categoryResearch
Peer-reviewedYes

Related research output

Zhou, J., 2018 Oct 5, Lund: Department of Physics, Lund University. 278 p.

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