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.
metal-surfaces
p917
cylindrical crystal
Chemistry
v108
CO oxidation
density functional theory
steps
platinum
ates of america
stepped surfaces
noble
reactivity
sites
crystal
planar laser-induced fluorescence
carbon-monoxide
Author
S. Blomberg
Lunds Universitet
Johan Zetterberg
Lunds Universitet
Jianfeng Zhou
Lunds Universitet
L. R. Merte
Lunds Universitet
J. Gustafson
Lunds Universitet
M. Shipilin
Lunds Universitet
Adriana Trinchero
Chalmers, Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
L. A. Miccio
Donostia International Physics Center
A. Magana
Universidad del Pais Vasco
M. Ilyn
CSIC-UPV - Centro de Fisica de Materiales (CFM)
F. Schiller
CSIC-UPV - Centro de Fisica de Materiales (CFM)
J. E. Ortega
CSIC-UPV - Centro de Fisica de Materiales (CFM)
Universidad del Pais Vasco
Donostia International Physics Center
F. Bertram
Deutsche Elektronen-Synchrotron
Henrik Grönbeck
Competence Centre for Catalysis (KCK)
Chalmers, Physics, Chemical Physics
E. Lundgren
Lunds Universitet
ACS Catalysis
2155-5435 (eISSN)
Vol. 7 1 110-114Subject Categories (SSIF 2011)
Physical Sciences
Roots
Basic sciences
DOI
10.1021/acscatal.6b02440