Reaction Engineering for scale-up and design of oxygen diffusion electrode

1.本研究的目的是解决氯碱电解系统氧扩散电极的放大问题。(1)带催化剂的气体扩散电极的结构和特性分析；(2)与放大有关的问题的解决；(3)电解槽的优化设计和工艺模拟。2.在第一个课题(1)中，苏东利用交流阻抗法等方法分析了电极组成与聚四氟乙烯含量和/或催化剂材料含量等因素之间的关系，同时对电极的寿命进行了分析。在第二个主题(2)中，Koda和Wang已经成功地对电极结构进行了建模，以估计针对各种结构参数的过电位行为。他们讨论了液体压力沿高度分布增加的影响，并用薄膜和水淹团聚模型分析了电极的过电位。在第三个主题(3)中，Nagamoto和Kameyama研究了模型电解室，并设计了一个合适的模拟器。为了实现气体扩散电极的实际应用，对Aikawa等人研制的小型到中型气体扩散电极进行了长期运行试验。综上所述，气体扩散电极技术是一种很有前途的近期技术。

1.The aim of the present research is to solve problems relevant to the scale-up of oxygen diffusion electrode in chlorine-alkali electrolysis system. The items are ; (1) analysis of structure and characteristics of gas diffusion electrodes with catalysts, (2)solution of the problems relevant to the scale-up, and (3) the optimum design of the electrolysis cell and the process simulation.2.In the first subject (1), Sudoh analyzed the relationship, using the AC impedance method and so forth, between the characteristics of electrolysis and the composition of electrode such as content of PTFE and/or content of catalyst materials, etc. At the same time, the life of electrodes has been analyzed. In the second subject (2), Koda and Wang have succeeded in the modeling of the electrode structure for estimating the over-potential behavior against various structure parameters. They discussed the effect of the increased distribution of liquid pressure along the heigt, and also analyzed the over-potential of the electrode in terms of the thin-film and flooded-agglomerate model. In the third subject (3), Nagamoto and Kameyama studied the model electrolysis chamber and designed an appropriate simulator. Intending the practical application of the present gas diffusion electrodes, long-term operation tests have been performed, using from small-sized to middle-sized electrodes by Aikawa et al.. In conclusion, the gas diffusion electrodes technology is a very promising near-future technology.