Kinetics of MnO2-catalyzed acetic acid oxidation in supercritical water

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Abstract

Acetic acid was oxidized in supercritical water over a bulk MnO2 catalyst. CO2, the complete oxidation product, was produced almost quantitatively. The rate of acetic acid disappearance exhibited saturation kinetics with respect to acetic acid, a maximum with respect to the oxygen concentration, and an independence from the water concentration. We identified a global rate law that was both qualitatively and quantitatively consistent with these experimental results. Using this catalytic rate law and literature rate laws for noncatalytic oxidation of acetic acid in supercritical water, we found that the use of MnO2 as an oxidation catalyst can reduce the reactor volume required for treatment of aqueous solutions of acetic acid by more than 2 orders of magnitude.

Original languageEnglish (US)
Pages (from-to)4014-4019
Number of pages6
JournalIndustrial and Engineering Chemistry Research
Volume39
Issue number11
DOIs
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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