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Strain dependent light-off temperature in catalysis revealed by planar laser-induced fluorescence

Sara Blomberg ; Johan Zetterberg ; Jianfeng Zhou ; Lindsay Merte ; Johan Gustafson ; Mikhail Shipilin ; Adriana Trinchero (Institutionen för fysik, Kemisk fysik (Chalmers) ; Kompetenscentrum katalys (KCK)) ; Luis Miccio ; Ana Magana ; Maxim Ilyn ; Frederik Schiller ; Enrique Ortega ; Florian Bertram ; Henrik Grönbeck (Institutionen för fysik, Kemisk fysik (Chalmers) ; Kompetenscentrum katalys (KCK)) ; Edvin Lundgren
ACS Catalysis Vol. 7 (2017), p. 110.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: CO oxidation; cylindrical crystal; density functional theory; planar laser-induced fluorescence; steps



Denna post skapades 2016-12-13. Senast ändrad 2017-09-12.
CPL Pubid: 246071

 

Institutioner (Chalmers)

Institutionen för fysik, Kemisk fysik (Chalmers)
Kompetenscentrum katalys (KCK)

Ämnesområden

Fysik

Chalmers infrastruktur