Header menu link for other important links
X
Studies on the potential of coal fly ash as a heterogeneous catalyst in oxidation of aqueous sodium sulfide solutions with hydrogen peroxide
D MALLICK, S KHANRA, S K CHAUDHURI
Published in John Wiley & Sons Ltd, Chichester, United Kingdom
1997
Volume: 70
   
Issue: 3
Pages: 231 - 240
Abstract
The potential of fly ash procured form coal-fired thermal power plants was studied as a heterogeneous catalyst in the oxidation of aqueous sodium sulfide solutions with hydrogen peroxide in the temperature range of 303-323 K. The effects of various parameters (source of fly ash, fly ash loading, initial concentrations of sodium sulfide and hydrogen peroxide, electrolyte and deactivation of catalytic effect of fly ash) were studied. For an initial sodium sulfide and hydrogen peroxide concentration of 26.98 x 10-2 kmol m-3 and 24.28 x 10-2 kmol m-3 respectively, only 4% (w/v) fly ash loading intensified the rate of oxidation by a factor of 4.52 over that without fly ash at 303 K. The deactivation of the catalytic effect of fly 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 fly ash in alkaline medium.The potential of fly ash procured form coal-fired thermal power plants was studied as a heterogeneous catalyst in the oxidation of aqueous sodium sulfide solutions with hydrogen peroxide in the temperature range of 303-323 K. The effects of various parameters (source of fly ash, fly ash loading, initial concentrations of sodium sulfide and hydrogen peroxide, electrolyte and deactivation of catalytic effect of fly ash) were studied. For an initial sodium sulfide and hydrogen peroxide concentration of 26.98 × 10-2 kmol m-3 and 24.28 × 10-2 kmol m-3 respectively, only 4% (w/v) fly ash loading intensified the rate of oxidation by a factor of 4.52 over that without fly ash at 303 K. The deactivation of the catalytic effect of fly 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 fly ash in alkaline medium.
About the journal
JournalData powered by TypesetJournal of Chemical Technology and Biotechnology
PublisherData powered by TypesetJohn Wiley & Sons Ltd, Chichester, United Kingdom
ISSN0268-2575