Comparison of the Surface and Subsurface Oxygen Reactivity and Dynamics with CO Adsorbed on Rh(111)
Comparison of the Surface and Subsurface Oxygen Reactivity and Dynamics with CO Adsorbed on Rh(111)
复制标题
Rh(111) 上吸附的 CO 的表面和地下氧反应性和动力学比较
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Sibener
中科院分区：
文献类型：
--
作者：
K. Gibson;D. R. Killelea;S. Sibener
测量了表面温度为450 K时，初始氧覆盖度为0.5 ML ≤ ΘO ≤ 1.6 ML的CO与Rh（111）反应产生的CO2的平移和角强度关系。覆盖范围从仅表面吸附的O到吸附和织边吸附的O。测得的CO2平移能与ΘO无关，并且大于稳态实验[Colonell et al.J.Chem.Phys.1995，103，6677]，稳态实验是在较低的O覆盖率下进行的，但遵循较高的ΘO导致较快的CO2的趋势。强度的角度依赖性可以用一个尖峰函数I = a cosn（θ）+（1 - a）cos（θ）来描述，其中a = 0.6，n = 8.6。同样，这与之前的稳态结果一致。这些观察结果表明，无论ΘO如何，反应几何形状相似;测得的动力学参数与是否有一些O在表面下无关，并表明边缘中的吸收氧仅作为储备氧。
The translational and angular intensity dependence of CO2 produced from the reaction of CO with an initial oxygen coverage of 0.5 ML ≤ ΘO ≤ 1.6 ML on Rh(111) at a surface temperature of 450 K was measured. This range of coverages goes from only surface absorbed O to both adsorbed and selvedge absorbed O. The measured CO2 translational energy is independent of ΘO and is larger than steady-state experiments [Colonell et al. J. Chem. Phys. 1995, 103, 6677], which were done at lower O coverages, but follows the trend that higher ΘO leads to faster CO2. The angular dependence of the intensity is well-described by a sharply peaked function of the form I = a cosn(θ) + (1 – a) cos(θ), with a = 0.6 and n = 8.6. Again, this was consistent with the previous steady-state results. These observations point to a similar reaction geometry regardless of ΘO; the measured dynamical parameters are independent of whether or not some of the O is subsurface and suggest that absorbed oxygen in the selvedge acts only as a reservo...