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 language | English |
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Pages (from-to) | 2435-2445 |
Number of pages | 11 |
Journal | Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering |
Volume | 38 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2003 |
Keywords
- Advanced oxidation
- Metal oxide catalysis
- Nitrobenzene
- Polyoxotungstate-catalyzed oxidation
- Wet air oxidation