Strain Dependent Light-off Temperature in Catalysis Revealed by Planar Laser-Induced Fluorescence
Artikel i vetenskaplig tidskrift, 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
Författare
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
Kompetenscentrum katalys
Chalmers, Fysik, Kemisk fysik
L. A. Miccio
Donostia International Physics Center
A. Magana
Universidad del Pais Vasco / Euskal Herriko Unibertsitatea
M. Ilyn
Consejo Superior de Investigaciones Científicas (CSIC)
F. Schiller
Consejo Superior de Investigaciones Científicas (CSIC)
J. E. Ortega
Universidad del Pais Vasco / Euskal Herriko Unibertsitatea
Donostia International Physics Center
Consejo Superior de Investigaciones Científicas (CSIC)
F. Bertram
Deutsches Elektronen-Synchrotron (DESY)
Henrik Grönbeck
Chalmers, Fysik, Kemisk fysik
Kompetenscentrum katalys
E. Lundgren
Lunds universitet
ACS Catalysis
21555435 (eISSN)
Vol. 7 1 110-114Fundament
Grundläggande vetenskaper
Ämneskategorier (SSIF 2011)
Atom- och molekylfysik och optik
Den kondenserade materiens fysik
DOI
10.1021/acscatal.6b02440