On the role of Fe(III) ions on the Reduction Mechanisms of Concentrated Nitric Acid

Abstract : The reduction mechanism of concentrated HNO3 (4 mol L-1) was investigated on a gold electrode at 40 °C by coupling electrochemical methods (cyclic voltammetry, chrononamperometry and electrochemical impedance spectroscopy) with chemical analysis of solution by Raman spectroscopy and the gas analysis by mass spectrometry. It was demonstrated that in such conditions, Fe(III) promotes the catalytic reduction reactions of concentrated HNO3. This was ascribed to the fact that Fe(III) modifies the chemical equilibrium in concentrated nitric acid by generating reduced species of nitric acid such as NO2. Then, the presence of these species catalyses the reduction of nitric acid with a mechanism which can tuned depending on the concentration in Fe(III) and the applied potential.
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J. Pellé, N. Gruet, B. Gwinner, M. Schlegel, Vincent Vivier. On the role of Fe(III) ions on the Reduction Mechanisms of Concentrated Nitric Acid. Electrochimica Acta, Elsevier, 2020, 335, pp.135578. ⟨10.1016/j.electacta.2019.135578⟩. ⟨hal-02430665⟩

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