期刊
ACS CATALYSIS
卷 7, 期 1, 页码 110-114出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b02440
关键词
CO oxidation; planar laser-induced fluorescence; density functional theory; cylindrical crystal; steps
资金
- Spanish Ministry of Economy [MAT2013-46593-C6-4-P]
- Basque Government [IT621-13]
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.
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