Novel Electrolytic\nRegeneration Method for Cyclic\nRegeneration of Ozone Decomposition MnO<sub><i>x</i></sub> Catalysts

The deactivation of ozone decomposition catalysts has\nbeen a bottleneck\nin their industrial application. As an efficient catalyst regeneration\nmethod, the liquid-phase method has attracted wide attention due to\nits operability and universality. However, the amount of waste liquid\ngenerated by the used regeneration liquid is a major drawback of its\napplication. Therefore, we propose an electrolytic regeneration method\nfor cyclic regeneration of MnO<sub><i>x</i></sub> ozone\ndecomposition catalysts by combining the advantages of the electrolytic\nprocess. In this method, NaNO<sub>2</sub> solution is used to react\nwith O<sub>2</sub><sup>2–</sup> to efficiently regenerate the\ninactivated MnO<sub><i>x</i></sub> catalysts, while NO<sub>2</sub><sup>–</sup> is oxidized to NO<sub>3</sub><sup>–</sup>, and then the oxidized NO<sub>3</sub><sup>–</sup> can be\nefficiently reduced to NO<sub>2</sub><sup>–</sup> through the\nelectrolysis process at the cathode with an 88% Faraday efficiency,\nultimately realizing the recycling of the NO<sub>2</sub><sup>–</sup>/NO<sub>3</sub><sup>–</sup> regeneration solution. By this\nmethod, the regeneration of inactivated MnO<sub><i>x</i></sub> ozone catalysts can be realized only using electricity.