As part of Wageningen University & Research’s research into (decentralized) electrochemical hydrogen peroxide production, they propose exploring whether paired electrosynthesis of chlorate and hydrogen peroxide can enable chromium(VI)-free chlorate electrolysis.
Hydrogen peroxide is a chemical oxidant which can be produced electrochemically via the two electron reduction of oxygen. Using an innovative WFBR reactor concept has enabled the production of concentrated hydrogen peroxide (~10%) at current densities of ≤4 kA/m2, similar to what occurs in chlorate production. Anion exchange membranes which are in contact with alkaline hydrogen peroxide are incorporated in the electrochemical reactor concept. These membranes have not shown deterioration during operation. The idea is therefore to use a membrane electrolyzer equipped with these anion exchange membranes (AEMs) for the production of chlorate. Placing an AEM between the electrodes would enable the reduction of chromium(VI) compounds or even chromium(VI)-free chlorate production.