Strain Dependent Light-off Temperature in Catalysis Revealed by Planar Laser-Induced Fluorescence

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• 作者：Sara BlombergJohan Zetterberg ; Jianfeng Zhou ; Lindsay R. Merte ; Johan Gustafson ; Mikhail Shipilin ; Adriana Trinchero ; Luis A. Miccio ; Ana Magaña ; Maxim Ilyn ; Frederik Schiller ; J. Enrique OrtegaFlorian Bertram ; Henrik Grönbeck ; Edvin Lundgren
• 刊名：ACS Catalysis
• 出版年：2017
• 出版时间：January 6, 2017
• 年：2017
• 卷：7
• 期：1
• 页码：110-114
• 全文大小：469K
• ISSN：2155-5435

文摘

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.