Strain Dependent Light-off Temperature in Catalysis Revealed by Planar Laser-Induced Fluorescence
Journal article, 2017
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.
platinum
carbon-monoxide
crystal
ates of america
p917
planar laser-induced fluorescence
steps
metal-surfaces
stepped surfaces
CO oxidation
cylindrical crystal
reactivity
density functional theory
v108
sites
noble
Chemistry
Author
S. Blomberg
Lund University
Johan Zetterberg
Lund University
Jianfeng Zhou
Lund University
L. R. Merte
Lund University
J. Gustafson
Lund University
M. Shipilin
Lund University
Adriana Trinchero
Competence Centre for Catalysis (KCK)
Chalmers, Physics, Chemical Physics
L. A. Miccio
Donostia International Physics Center
A. Magana
University of the Basque Country (UPV/EHU)
M. Ilyn
Spanish National Research Council (CSIC)
F. Schiller
Spanish National Research Council (CSIC)
J. E. Ortega
University of the Basque Country (UPV/EHU)
Donostia International Physics Center
Spanish National Research Council (CSIC)
F. Bertram
Deutsches Elektronen-Synchrotron (DESY)
Henrik Grönbeck
Chalmers, Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
E. Lundgren
Lund University
ACS Catalysis
21555435 (eISSN)
Vol. 7 1 110-114Roots
Basic sciences
Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1021/acscatal.6b02440