Merits of polyoxotungstates as environmental remediation catalysts: A novel wet oxidation technology for refractory industrial pollutants

I. Arslan Alaton*, J. L. Ferry

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The catalytic effect of silicadodecatungstate (SiW12O 404-) on the oxidation of nitrobenzene in subcritical water (T = 100-300°C; P = 0.1-8.6 MPa, pH = 2.6) was examined. In the absence of SiW12O404- catalyst nitrobenzene oxidation slowed down significantly after a brief period of rapid degradation and an average of 40% nitrobenzene removal. The catalytic effect of SiW 12O404- becomes particularly pronounced after a temperature dependent induction period. Catalyzed wet air oxidation continued until the degradation of the parent compound was complete provided that experimental conditions were harsh enough (T > 200°C). Product distribution analysis suggested that the oxidation paths for catalyzed and uncatalyzed wet air oxidation of nitrobenzene are similar, but the analysis was not definitive.

Original languageEnglish
Pages (from-to)2435-2445
Number of pages11
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume38
Issue number10
DOIs
Publication statusPublished - 2003

Keywords

  • Advanced oxidation
  • Metal oxide catalysis
  • Nitrobenzene
  • Polyoxotungstate-catalyzed oxidation
  • Wet air oxidation

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