Diatomic Steps in Pt(997) Surfaces Are Better Catalysts than Monatomic Steps for the CO Oxidation Reaction near Atmospheric Pressure
Diatomic Steps in Pt(997) Surfaces Are Better Catalysts than Monatomic Steps for the CO Oxidation Reaction near Atmospheric Pressure
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DOI：
10.1021/acscatal.5b02526
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发表时间：
2016-01
期刊：
影响因子：
12.9
通讯作者：
O. Balmes;G. Prévot;X. Torrelles;E. Lundgren;S. Ferrer
中科院分区：
文献类型：
--
作者：
O. Balmes;G. Prévot;X. Torrelles;E. Lundgren;S. Ferrer
在接近环境压力的流动反应器中，通过 X 射线衍射研究了 Pt(997) 单晶模型催化剂将 CO 氧化为 CO2 的情况。根据温度和气体成分，表面可以由由 9 个原子宽的台阶分隔的单原子台阶或由 18 个原子宽的台阶分隔的双原子台阶组成。已发现双原子阶梯表面对于二氧化碳的产生显着更活跃。研究了反应条件下单步到双步转变的动力学，以及转变温度与气体组成的依赖性。
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.