Dynamics on individual reaction sites in steady-state carbon monoxide oxidation on stepped platinum(113)
Dynamics on individual reaction sites in steady-state carbon monoxide oxidation on stepped platinum(113)
复制标题
阶梯铂稳态一氧化碳氧化中各个反应位点的动力学(113)
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
T. Matsushima
中科院分区：
文献类型：
--
作者：
Geng‐yu Cao;M. Moula;Y. Ohno;T. Matsushima
用角分辨动力学和稳态速度测量方法研究了一氧化碳在台阶Pt（113）=（s）2（111）×（001）表面上氧化的反应动力学和动力学. CO2解吸几乎沿着（111）位法线或（001）位法线急剧准直。只有两个反应部位，即（111）和（001）部位有效。CO2的平移能是整个站点切换中每个站点的特征。在高于520 K的表面温度在活性区，在那里的反应是一级在CO中，（111）位的偏好被抑制与CO压力的增加。低于520 K，另一方面，网站切换缓慢发生在有限的条件下，在这两个网站大大有助于反应和亚稳态吸附相似乎形成。（111）位比（001）位的优先性是由于前者对氧的反应性更高。
The reaction kinetics and dynamics of carbon monoxide oxidation on a stepped Pt(113) = (s)2(111) × (001) surface were studied by angle-resolved kinetic and velocity measurements at the steady state. CO2 desorption sharply collimated nearly along either the (111) site normal or the (001) site normal. Only two reaction sites, the (111) and (001) sites, were operative. The translational energy of CO2 was characteristic of each site throughout a site switching. At surface temperatures above 520 K in the active region, where the reaction was first order in CO, the preference of the (111) site was suppressed with increasing CO pressure. Below 520 K, on the other hand, site switching slowly took place under limited conditions, in which both sites considerably contributed to the reaction and a meta-stable adsorbed phase seemed to be formed. The preference for the (111) site over the (001) site was caused by the former's higher reactivity of oxygen.