The Phase Stability of Cerium Species in Aqueous Systems: III. The Systems Dimeric Ce(IV) Species
The Phase Stability of Cerium Species in Aqueous Systems: III. The Systems Dimeric Ce(IV) Species
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DOI：
10.1149/1.2130574
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发表时间：
2006
影响因子：
3.9
通讯作者：
P. Yu;T. O’keefe
中科院分区：
文献类型：
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作者：
P. Yu;T. O’keefe
铈二聚体物种的平衡和热力学数据进行了计算的和系统。发现Ce（IV）具有形成二聚体的趋势，特别是当总铈浓度高于0.001M时。有三种主要的可溶性二聚体形式，在本文中考虑：，和，都具有非常相似的标准电位。当它们在溶液中共存时，Ce（IV）二聚体的浓度比取决于总铈浓度、氧化剂和在某些情况下的pH。增加每个单独因素的值有利于二聚体的形成。同时发现，直接氧化的二聚体似乎是微不足道的，但氧化的三个二聚体将是更有利的。
Equilibria and thermodynamic data for cerium dimer species were calculated for both the and systems. It was found that Ce (IV) has a tendency to form dimers, especially when the total cerium concentration is higher than 0.001 M. There are three major soluble dimer forms considered in this paper:, and, all having very similar standard potentials. When they coexist in solution, the concentration ratio of the Ce (IV) dimer to depends on the total cerium concentrations, the oxidizing agent, and in some cases the pH. Increasing the value of each individual factor favors the formation of dimers. It was also found that the direct oxidation of to dimers by appeared to be insignificant, but the oxidation of to the three dimers by would be much more favorable.