Novel Electrolytic Regeneration Method for Cyclic Regeneration of Ozone Decomposition MnO_<i>x</i> 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_<i>x</i> 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_<i>x</i> 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_<i>x</i> ozone catalysts can be realized only using electricity.