Method for self-cleaning of electrodes in a process for the electrolytic reduction of gaseous sulfur dioxide

Abstract

The application discloses a method for electrode self-cleaning in a gaseous sulfur dioxide electrolytic reduction process, and belongs to the technical field of sulfur dioxide flue gas resource utilization. In a traditional SO2 electrolytic process, the problem of sulfur adhesion to the electrode not only reduces the effective reaction area of the electrode, covers the catalytic active sites of the electrode, reduces the efficiency of electrocatalytic reduction reaction, but also further influences the conductivity of the electrode, increases the resistance of the electrode, and shortens the service life of the electrode, thereby increasing the production cost. In the method, SO2 gas is intermittently introduced. When the SO2 is introduced, the electrode surface mainly undergoes an SO2 reduction reaction. When the introduction of the SO2 is stopped, the electrode surface undergoes a proton adsorption and a reduction reaction of elemental sulfur, the deposition of the elemental sulfur on the electrode interface is avoided, and the self-cleaning of the sulfur on the electrode surface is realized.

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