Abstract
Voltammetric investigations into the process of anodic decomposition of urea using Ti/Pt, Ti/(Pt–Ir) 70:30, Ti/RuO 2, Ti/(RuO 2–TiO 2) 40:60, Ti/(RuO 2–TiO 2–IrO 2) 20:60:20, Ti/(Ta 2O 5–IrO 2) 70:30 electrodes have been carried out. Two anodes namely (Ti/(Pt–Ir) 70:30 and Ti/(Ta 2O 5–IrO 2) 70:30) were found to be stable enough and indicated the required activity to produce non-toxic N 2 and CO 2 in place of nitrites and nitrates, the commonly reported electrochemical urea oxidation products. The kinetics of the process in question using the above two electrodes was further examined in a periodic electrolyzer. The effect of the anodic current density ( j = 2–10 A/dm 2), initial urea concentration ( c 0M = 1–10 g/dm 3) and the concentration of sodium chloride ( c NaCl = 1–10 g/dm 3) on basic process indices (average rate of urea decomposition, a; current efficiency, W p, and unit DC power consumption, Z j ) was discussed.
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