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


Alaton I. , Ferry J.

JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, cilt.38, ss.2435-2445, 2003 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 38 Konu: 10
  • Basım Tarihi: 2003
  • Doi Numarası: 10.1081/ese-120023452
  • Dergi Adı: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
  • Sayfa Sayıları: ss.2435-2445

Özet

The catalytic effect of silicadodecatungstate (SiW12O404-) on the oxidation of nitrobenzene in subcritical water (T = 100-300degreesC; 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 SiW12O404- 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 > 200degreesC). 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.