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• W2007745707 abstract "Experimental results show that the electrochemical oxidation of oxalate in alkaline solutions at lead dioxide anodes can be achieved at conditions of much higher alkalinity than previously reported in the literature using other types of electrodes. The oxalate in solutions containing 0.05 mol/L ∽0.1 mol/L sodium oxalate was anodically oxidized to carbonate with high efficiency in the presence of up to ∽0.1 mol/L NaOH at 70°C by using lead dioxide anodes doped with silver and tin. The addition of small amounts of silver and tin (e.g., 0.06% by weight) to lead dioxide films significantly increases the oxalate oxidation currents and current efficiencies. These metals can be incorporated into the lead dioxide films by in situ oxidation of lead-silver-tin alloys. Although oxalate could not be electrochemically oxidized using lead dioxide electrodes at extremely high pH's (greater than ∽ 14), reduction of the oxalate concentration to less than about 0.04 mol/L could be achieved at greater than 50% current efficiency at pH's up to about 13. Des résultats expérimentaux montrent que ľoxydation électrochimique de ľoxalate dans des solutions alcalines pour des anodes de bioxyde de plomb peut ětre réalisée dans des conditions ďalcalinité beaucoup plus grande que ne ľindiquent les diverses expériences publiées utilisant ďautres types ďelectrodes. Ľoxalate dans des solutions de 0,05 mol/L ∽ 0,1 mol/L est oxydé anodiquement en carbonate avec un rendement élevé en présence de NaOH jusq 'à ∽0,1 mol/L à 70°C lorsq'on utilise des anodes de bioxyde de plomb renforcées par de ľargent et de ľétain. Ľaddition de petites quantités ďargent et ďétain (p. ex. 0,06% en poids) dans les films de bioxyde de plomb augmente considérablement les courants ďoxydation ďoxalate et le rendement en courant. Ces métaux peuvent ětre incorporés aux films de bioxyde de plomb par oxydation in situ des alliages plomb-argent-étain. Bien que ľoxalate ne pourrait ětre oxydé électrochimiquement par des électrodes de bioxyde de plomb à des pH extrěmement élevén (supérieurs à ∽ 14), il serait possible de réduire la concentration ďoxalate à moins de 0,04 mol/L environ avec des rendements en courant supérieurs à 50% à des pH allant jusq 'à environ 13." @default.
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• W2007745707 date "1993-04-01" @default.
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• W2007745707 title "Lectrochemical oxidation of oxalate in alkaline solutions" @default.
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• W2007745707 doi "https://doi.org/10.1002/cjce.5450710208" @default.
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