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.

sites

reactivity

density functional theory

noble

steps

crystal

carbon-monoxide

cylindrical crystal

ates of america

p917

metal-surfaces

v108

platinum

stepped surfaces

planar laser-induced fluorescence

CO oxidation

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

Centro de Física de Materiales (CSIC-UPV/EHU)

F. Schiller

Centro de Física de Materiales (CSIC-UPV/EHU)

J. E. Ortega

University of the Basque Country (UPV/EHU)

Centro de Física de Materiales (CSIC-UPV/EHU)

Donostia International Physics Center

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 1 110-114

Roots

Basic sciences

Subject Categories

Atom and Molecular Physics and Optics

Condensed Matter Physics

DOI

10.1021/acscatal.6b02440

More information

Latest update

4/5/2022 1