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Electrochemical investigations of the Ce(m)/Ce(iv) couple related to a Ce(iv)-assisted process for SO2/NOx abatement

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Abstract

This paper presents the results of electrochemical investigations of the Ce(lii)/Ce(iv) couple, for use in a SO2/NOx abatement process. A voltammetric study was conducted at a platinum rotating disc electrode for the conditions corresponding to the gas scrubbing processes. The charge transfer coefficients were weakly affected by increasing the concentration of sulfuric acid up to 5 m. Conversely, the diffusion coefficients and the rate constants were decreasing functions of the concentration of sulfuric acid. The electrochemical regeneration of Ce(iv) was also studied at a platinized titanium surface and the oxidation appeared to be linked to other oxidative processes such as O2 formation. Batch experiments, carried out in a filter press cell, showed good faradaic yields even in the potential domain corresponding to significant background current attributable to the supporting electrolyte.

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Nzikou, J.M., Aurousseau, M. & Lapicque, F. Electrochemical investigations of the Ce(m)/Ce(iv) couple related to a Ce(iv)-assisted process for SO2/NOx abatement. J Appl Electrochem 25, 967–972 (1995). https://doi.org/10.1007/BF00241592

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Keywords

  • Sulfuric Acid
  • Batch Experiment
  • Supporting Electrolyte
  • Disc Electrode
  • Press Cell