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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • 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)
Forskningsområden

Nyckelord

Originalspråkengelska
Sidor (från-till)110-114
Antal sidor5
TidskriftACS Catalysis
Volym7
Utgivningsnummer1
StatusPublished - 2017 jan 6
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Zhou, J., 2018 okt 5, Lund: Department of Physics, Lund University. 278 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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