Sulfur dioxide exploitation by electrochemical oxidation of sulfite in near-neutral pH electrolytes: A kinetics and mechanistic study

R. A. Márquez-Montes, R. E. Orozco-Mena, D. Lardizábal-Gutiérrez, D. Chávez-Flores, A. López-Ortíz, V. H. Ramos-Sánchez

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Electrochemical oxidation of sulfite ions offers an efficient and profitable approach to the conversion of sulfur dioxide, a harmful air pollutant, into valuable by-products via flue gas desulfurization. Here, the electrochemical oxidation of sulfite in near-neutral pH electrolytes is studied in order to determine kinetic parameters and a reaction mechanism. Sulfite electrooxidation on palladium is demonstrated at pH 7.5 and 8.5, the latter being comparable to platinum. Anodic charge transfer coefficients and non-linear reaction orders are linked to a mechanism which involves sulfite adsorption at low potentials. This study proves that sulfite electrooxidation on palladium at near-neutral pH is a useful approach for sulfur dioxide exploitation.

Original languageEnglish (US)
Article number106481
JournalElectrochemistry Communications
Volume104
DOIs
StatePublished - Jul 2019
Externally publishedYes

Keywords

  • Kinetics
  • Palladium
  • Reaction mechanism
  • Sulfite electrooxidation

ASJC Scopus subject areas

  • Electrochemistry

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