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.

ates of america

v108

carbon-monoxide

density functional theory

p917

steps

metal-surfaces

CO oxidation

noble

crystal

reactivity

cylindrical crystal

Chemistry

platinum

stepped surfaces

sites

planar laser-induced fluorescence

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

Chalmers, Fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

L. A. Miccio

Donostia International Physics Center

A. Magana

Universidad del Pais Vasco/ Euskal Herriko Unibertsitatea

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)

Donostia International Physics Center

Universidad del Pais Vasco/ Euskal Herriko Unibertsitatea

F. Bertram

Deutsches Elektronen-Synchrotron (DESY)

Henrik Grönbeck

Kompetenscentrum katalys (KCK)

Chalmers, Fysik, Kemisk fysik

E. Lundgren

Lunds universitet

ACS Catalysis

2155-5435 (eISSN)

Vol. 7 1 110-114

Ämneskategorier

Fysik

Fundament

Grundläggande vetenskaper

DOI

10.1021/acscatal.6b02440

Mer information

Senast uppdaterat

2018-08-27