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

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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.