Abstract
The electrochemical mechanism for ethylene glycol oxidation by polycrystalline platinum at 0.30 V/SCE in 0.10 M HClO4 is investigated by reflection infrared spectroscopic, coulometric, and voltammetric measurements of 0.10 M ethylene glycol, glycolaldehyde, glyoxal, glycolic acid, glyoxylic acid, and oxalic acid. CO2, glycolic acid, and adsorbed CO are identified as reaction products for ethylene glycol and glycolaldehyde oxidation. A two-path mechanism is proposed for 0.30 V oxidation of ethylene glycol and glycolaldehyde: either the reacting molecule undergoes direct oxidation to desorbing glycolic acid or it undergoes direct dissociation of the carbon−carbon bond to form various amounts of aqueous CO2 and adsorbed CO. Calculations are performed, assuming the quantities of CO and CO2 depend statistically upon the identities of the two functional groups comprising the two-carbon reactant molecule and upon oxidation conditions. Calculation results for dissociation at 0.30 V show that nearly 100% of the c...
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