Tulska A. The depolarization of the anodic process by SO2 in the electrochemical synthesis of hydrogen

Object of study: the processes of anodic electrolysis of aqueous solutions of H2SO4 with anodic depolarization by SO2. Objective: determination of technological parameters of electrolysis based on theoretical and experimental study of patterns of oxidation of SO2 in the electrolysis of sulfuric acid. Methods: Stationary and cyclic voltammetry using potentiostate PI 50.1.1, switching method using an oscilloscope OZ-38 and DC power "BVP 15V 15A timer / ampere RS-485" and gravimetric analysis of stability of porous graphite and activated gas-diffusion anodes. Theoretical and practical results: technological scheme of activation graphite by applying composite coatings was developed, technological parameters of electrochemical combination of hydrogen were defined, thus reduce specific consumption of electricity by 38 ... 45% compared with traditional aqueous-alkaline method . Grounded anode gas diffusion structure for the technical implementation of anodic depolarization SO2 process that will provide wide range of operating current densities. Scientific novelty: for the first time a chart S (IV) - pH and E-pH was developed to set limits, for which there is oxidation of gaseous SO2; Established that the SO2 oxidation on the surface of platinum, RuO2 and glass-carbon occurs at potentials up to 0.7 V, and at potentials above 0.7 runs in the process involving oxygen-particles adsorbed on the surface of the anode; determined that the SO2 oxidation current density on oxides of platinum, is much lower compared to non-oxidized platinum and glass carbon; determined that heterophase oxidation of SO2 gas diffusion anode is appropriate following composition: the foundation of the PG-50, active carbon and Pt, RuO2, MoO3, WO3. Degree of implementation: The effectiveness of the technology developed electrochemical hydrogen from the anode depolarization process SO2 confirmed the positive results of pilot tests in OOO "STC PNYT" (m. Kharkiv) and LLC "ECOPOLYMER" (Kharkiv) .Rezultaty research implemented in the educational process of the department Technical Electrochemistry NTU "KPI" while teaching courses on specialty 051301 - "Technical electrochemistry". Scope: energy and chemical industries of Ukraine, the educational process.