Diatomic Steps in Pt(997) Surfaces Are Better Catalysts than Monatomic Steps for the CO Oxidation Reaction near Atmospheric Pressure
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- 作者：O. Balmes ; G. Prevot ; X. Torrelles ; E. Lundgren ; S. Ferrer
- 刊名：ACS Catalysis
- 出版年：2016
- 出版时间：February 5, 2016
- 年：2016
- 卷：6
- 期：2
- 页码：1285-1291
- 全文大小：396K
- ISSN：2155-5435
文摘
The oxidation of CO to CO2 has been investigated on Pt(997) single-crystal model catalysts with a flow reactor near ambient pressure with X-ray diffraction. Depending on the temperature and gas composition, the surface may consist of monatomic steps separated by 9 atom wide terraces or diatomic steps separated by 18 atom wide terraces. The diatomic stepped surface has been found to be significantly more active for CO2 production. The kinetics of the single- to double-step transition under reaction conditions has been investigated, as well as the dependence of the transition temperature with the gas composition.