Mechanism of the CO oxidation reaction on O-precovered Pt(111) surfaces studied with near-edge x-ray absorption fine structure spectroscopy.
Mechanism of the CO oxidation reaction on O-precovered Pt(111) surfaces studied with near-edge x-ray absorption fine structure spectroscopy.
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DOI：
10.1063/1.1869415
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发表时间：
2005-04
期刊：
影响因子：
--
通讯作者：
I. Nakai;Hiroshi Kondoh;K. Amemiya;M. Nagasaka;T. Shimada;Reona Yokota;A. Nambu;Toshiaki Ohta
中科院分区：
文献类型：
--
作者：
I. Nakai;Hiroshi Kondoh;K. Amemiya;M. Nagasaka;T. Shimada;Reona Yokota;A. Nambu;Toshiaki Ohta
利用时间分辨近边X射线吸收精细结构光谱研究了氧预包的Pt(111)表面上CO氧化反应的机理。整个反应过程由两条不同的路径组成：（1）孤立的氧原子与吸附的CO的反应，（2）CO饱和后岛-外围氧原子的反应。 CO共吸附起到了诱导O原子空间分布动态变化的作用，从而切换了两个反应路径。这些机制已通过动力学蒙特卡罗模拟得到证实。还研究了共吸附水在反应机理中的影响。
The mechanism of CO oxidation reaction on oxygen-precovered Pt(111) surfaces has been studied by using time-resolved near-edge x-ray absorption fine structure spectroscopy. The whole reaction process is composed of two distinct paths: (1) a reaction of isolated oxygen atoms with adsorbed CO, and (2) a reaction of island-periphery oxygen atoms after the CO saturation. CO coadsorption plays a role to induce the dynamic change in spatial distribution of O atoms, which switches over the two reaction paths. These mechanisms were confirmed by kinetic Monte Carlo simulations. The effect of coadsorbed water in the reaction mechanism was also examined.