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.

steps

cylindrical crystal

CO oxidation

planar laser-induced fluorescence

density functional theory

Author

Sara Blomberg

Johan Zetterberg

Jianfeng Zhou

Lindsay R. Merte

Johan Gustafson

Mikhail Shipilin

Lund University

Adriana Trinchero

Competence Centre for Catalysis (KCK)

Chalmers, Physics, Chemical Physics

Luis Miccio

Ana Magana

Maxim Ilyn

Frederik Schiller

Enrique Ortega

Florian Bertram

Henrik Grönbeck

Chalmers, Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Edvin Lundgren

ACS Catalysis

2155-5435 (eISSN)

Vol. 7 110-

Subject Categories

Physical Sciences

More information

Latest update

3/6/2018 1