NebelsaisonElectrochemical Synthesis of Organic Substances Using Hydrophobized Electrodes

V. L. Kornienko
Российский электрохимический журнал
Abstract / Full Text

The results of investigations into the processes involved in the electrochemical synthesis of organicsubstances using porous, hydrophobized electrodes are generalized. The following substances were electrosynthesized from gaseous and liquid parent compounds with limited solubility in water: CH4, C2H6, and C2H4—outof CO; HCOOH—out of CO2; RCl—out of RH; CF2CFCl—out of CF2Cl–CFCl2; CH3NHOH—out ofCH3NO2; RCOOH—out of RCH2OH; and o-C6H4OHNH2—out of o-C6H4OHNO2. The hydrophobized electrodes are found to have no effect on the mechanism of the electrode transformations of the organic substances.However, the hydrophobized electrodes change the ratios of the target products by significantly influencing themass-transfer stage. It is also found that another limiting stage of the electrosynthesis in hydrophobized electrodes, in addition to mass transfer of the reagent, may be the removal of the target and side products from theporous volume of the electrodes. The macrokinetics of the electrosynthesis processes in hydrophobized electrodes is found to be determined by the nature of the electrode materials, the quantitative content of the hydrophobizer, and the technology used to produce these electrodes. The liquid-gaseous electrodes also display amarked dependence on their total porosity. A sharp deceleration of hydrogen evolution was observed during theelectrolysis of organic substances. The deceleration was especially pronounced during dehalogenation of 1,1,2-trifluorotrichloroethane. Hydrophobized electrodes are shown to have much promise for electrosynthesis. Theyensure intensification of the processes, enhance selectivity, and simplify isolation of the target products.