Novel Electrolytic Regeneration Method for Cyclic Regeneration of Ozone Decomposition MnO Catalysts

The deactivation of ozone decomposition catalysts has been a bottleneck in their industrial application. As an efficient catalyst regeneration method, the liquid-phase method has attracted wide attention due to its operability and universality. However, the amount of waste liquid generated by the used regeneration liquid is a major drawback of its application. Therefore, we propose an electrolytic regeneration method for cyclic regeneration of MnO ozone decomposition catalysts by combining the advantages of the electrolytic process. In this method, NaNO₂ solution is used to react with O₂^2- to efficiently regenerate the inactivated MnO catalysts, while NO₂^- is oxidized to NO₃^-, and then the oxidized NO₃^- can be efficiently reduced to NO₂^- through the electrolysis process at the cathode with an 88% Faraday efficiency, ultimately realizing the recycling of the NO₂^-/NO₃^- regeneration solution. By this method, the regeneration of inactivated MnO ozone catalysts can be realized only using electricity.