The catalytic wet oxidation (CWO) process with Cu2+, Mn2+, and Ce2+ as catalysts, respectively, was applied to investigate the degradation of ferrocyanide (Fe(CN)64-) solution. For the conversions of Fe(CN)-64- during the noncatalytic wet oxidation (WO) process up to 99.9% was attained after a reaction time of 70 min. The COD removal efficiency was observed as only 38% in a noncatalytic oxidation; however, it could be enhanced to 75%, 61%, and 50% in the presence of Cu2+, Mn2+, and Ce2+, respectively. Both noncatalytic and catalytic wet oxidation processes of Fe(CN)-64- solution were considered to be a two-step reaction at pH 9.0 and temperatures of 433-473 K. The oxidation rate was initially fast, followed by a slow step, which did obey first-order kinetics with respect to chemical oxygen demand (COD). Both the 2+ and Ce2+ catalyzed oxidation showed a significant effect on the reduction of activation energy during the first reaction of the WO runs.
Study on wet air oxidation of aqueous ferrous cyanide solution catalyzed by three metal salts
B.-N. Lee, J.-C. Lou; Study on wet air oxidation of aqueous ferrous cyanide solution catalyzed by three metal salts. Water Sci Technol 1 August 2000; 42 (3-4): 131–136. doi: https://doi.org/10.2166/wst.2000.0369
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