Reaction-path switching induced by spatial-distribution change of reactants: CO oxidation on Pt(111).
Reaction-path switching induced by spatial-distribution change of reactants: CO oxidation on Pt(111).
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DOI：
10.1063/1.1796235
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发表时间：
2004-09
期刊：
影响因子：
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通讯作者：
I. Nakai;H. Kondoh;K. Amemiya;M. Nagasaka;A. Nambu;T. Shimada;T. Ohta
中科院分区：
文献类型：
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作者：
I. Nakai;H. Kondoh;K. Amemiya;M. Nagasaka;A. Nambu;T. Shimada;T. Ohta
利用时间分辨近边X射线吸收精细结构谱研究了CO暴露过程中Pt（111）表面CO氧化的机理。两个不同的反应过程被发现顺序发生，孤立的氧原子和岛周边氧原子有助于每个过程。结合反应动力学的原位监测和Monte Carlo模拟表明，CO共吸附起着诱导O原子的空间分布的动态变化的作用，切换的两个反应路径。
We studied the mechanism of CO oxidation on O-covered Pt(111) surfaces during CO exposure by means of time-resolved near edge x-ray absorption fine structure spectroscopy. Two distinct reaction processes were found to occur sequentially; isolated O atoms and island-periphery O atoms contribute to each process. Combination of in situ monitoring of the reaction kinetics and Monte Carlo simulations revealed that CO coadsorption plays a role of inducing the dynamic change in spatial distribution of O atoms, which switches over the two reaction paths.