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.

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

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

CSIC-UPV - Centro de Fisica de Materiales (CFM)

F. Schiller

CSIC-UPV - Centro de Fisica de Materiales (CFM)

J. E. Ortega

Universidad del Pais Vasco / Euskal Herriko Unibertsitatea

CSIC-UPV - Centro de Fisica de Materiales (CFM)

Donostia International Physics Center

F. Bertram

Deutsches Elektronen-Synchrotron (DESY)

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

Kompetenscentrum katalys

E. Lundgren

Lunds universitet

ACS Catalysis

2155-5435 (eISSN)

Vol. 7 1 110-114

Fundament

Grundläggande vetenskaper

Ämneskategorier

Atom- och molekylfysik och optik

Den kondenserade materiens fysik

DOI

10.1021/acscatal.6b02440

Mer information

Senast uppdaterat

2022-04-05