Journal
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Volume 51, Issue 2, Pages 185-189Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S102319351502007X
Keywords
electroreduction of oxygen; electrosynthesis of hydrogen peroxide; gas-diffusion electrode; acetylene black; concentrated solutions of hydrogen peroxide; peracetic acid; performic acid; urea perhydrate
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Electrosynthesis of hydrogen peroxide from oxygen was performed in a gas-diffusion carbon black electrode in aqueous solutions of various salts with alkali metal and ammonium cations with urea additions and without them at current densities of 0.1-0.15 A cm(-2). The resulting solutions containing 0.8-3.0 M H2O2 were concentrated to 25 M and dried with addition of urea to obtain the urea-H2O2 complex. The concentrated solutions of H2O2 were used to prepare peracetic and performic acids. Solid precipitates with up to 92 wt % urea perhydrate and up to 4 M peracid solutions were obtained. The presence of inorganic salts did not hinder the formation of these compounds. The presence of 1 M urea in solution had no adverse effect on the electrosynthesis of H2O2. These results indicate that the applications of electrosynthesis of H2O2 from O-2 in carbon black gas-diffusion electrodes can be significantly expanded for further use of the resulting solutions for the synthesis of various products.
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