Early Removal of Weak-Binding Adsorbates by Kinetic Separation
Early Removal of Weak-Binding Adsorbates by Kinetic Separation
复制标题
通过动力学分离早期去除弱结合吸附物
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. M. Calbi
中科院分区：
文献类型：
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作者：
J. Burde;M. M. Calbi
当表面暴露于相同分压下的二元气体混合物时，由于其优先吸附，预期与其结合更强烈的物质将占据更高百分比的表面。然而，在平衡过程中不一定是这种情况，因为具有较小结合的物质吸附得更快。在这里，我们表明，基于结合能和吸附速率的竞争规则的二元混合物的吸附在一个均匀的晶格上的网站的动力学。这产生了一个选择性过程，其效果与平衡时发生的效果相反：较弱的物种通过其更快的吸附而被早期去除。
When a surface is exposed to a binary mixture of gases at the same partial pressures, it is expected that the species that binds to it more strongly will occupy a higher percentage of the surface due to its preferential adsorption. However, that is not necessarily the case during the equilibration process because the species with smaller binding adsorbs faster. Here, we demonstrate that a competition based on both binding energies and adsorption rates rules the kinetics of adsorption of a binary mixture on a homogeneous lattice of sites. This generates a selectivity process that has the opposite effect to the one that happens at equilibrium: the early removal of the weaker species by its faster adsorption.