Studies on the potential of coal fly ash as a heterogeneous catalyst in oxidation of aqueous sodium sulfide solutions with hydrogen peroxide
✍ Scribed by Durjoy Mallick; Swapan Khanra; Swades K. Chaudhuri
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1997
- Tongue
- English
- Weight
- 380 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
The potential of Ñy ash procured form coal-Ðred thermal power plants was studied as a heterogeneous catalyst in the oxidation of aqueous sodium sulÐde solutions with hydrogen peroxide in the temperature range of 303È323 K. The e †ects of various parameters (source of Ñy ash, Ñy ash loading, initial concentrations of sodium sulÐde and hydrogen peroxide, electrolyte and deactivation of catalytic e †ect of Ñy ash) were studied. For an initial sodium sulÐde and hydrogen peroxide concentration of 26É98 ] 10~2 kmol m~3 and 24É28 ] 10~2 kmol m~3 respectively, only 4% (w/v) Ñy ash loading intensiÐed the rate of oxidation by a factor of 4É52 over that without Ñy ash at 303 K. The deactivation of the catalytic e †ect of Ñy ash was found to be less than 20% even after six repeated uses. The kinetics of aqueous phase decomposition of hydrogen peroxide was also studied in the presence of Ñy ash in alkaline medium.