Novel Electrolytic Regeneration Method for Cyclic Regeneration of Ozone Decomposition MnO x 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 x ozone decomposition catalysts by combining the advantages of the electrolytic process. In this method, NaNO 2 solution is used to react with O 2 2- to efficiently regenerate the inactivated MnO x catalysts, while NO 2 - is oxidized to NO 3 - , and then the oxidized NO 3 - can be efficiently reduced to NO 2 - through the electrolysis process at the cathode with an 88% Faraday efficiency, ultimately realizing the recycling of the NO 2 - /NO 3 - regeneration solution. By this method, the regeneration of inactivated MnO x ozone catalysts can be realized only using electricity.