Chlor-alkali electrolysis with oxygen depolarized cathodes: history,present status and future prospects |
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| Authors: | Imad Moussallem Jakob Jörissen Ulrich Kunz Stefan Pinnow Thomas Turek |
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| Affiliation: | (1) Institute of Chemical Process Engineering, Clausthal University of Technology, Leibnizstrasse 17, 38678 Clausthal-Zellerfeld, Germany;(2) Technical Chemistry A, University of Dortmund, Emil-Figge-Strasse 66, 44227 Dortmund, Germany |
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| Abstract: | The historical development, current status and future prospects of chlor-alkali electrolysis with oxygen depolarized cathodes (ODCs) are summarized. Over the last decades, membrane chlor-alkali technology has been optimized to such an extent that no substantial reduction of the energy demand can be expected from further process modifications. However, replacement of the hydrogen evolving cathodes in the classical membrane cells by ODCs allows for reduction of the cell voltage and correspondingly the energy consumption of up to 30%. This replacement requires the development of appropriate cathode materials and novel electrolysis cell designs. Due to their superior long-term stability, ODCs based on silver catalysts are very promising for oxygen reduction in concentrated NaOH solutions. Finite-gap falling film cells appear to be the technically most mature design among the several ODC electrolysis cells that have been investigated. |
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| Keywords: | Chlor-alkali electrolysis Oxygen depolarized cathode Oxygen reduction Catalyst Gas diffusion electrode |
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