(63c) Simulation of Rotating Ring Disk Electrode : Effects of Ionic Migration in Presence of Homogeneous Oxidation of Fe2+ in 0.01(M) H2so4 Under O2 Pressure-Disk Results
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Results for disk region indicate that concentration boundary layer thickness of limiting reactant (Fe3+) reduces by approximately 16% when migration mode of transport is present as compared to concentration boundary layer thickness of the limiting reactant (Fe3+) in absence of migration.
Simulation results show that in presence of migration, steady state limiting disk current is 0.4364 mA which is 34.84% of steady state limiting disk current in absence of migration.
Results also indicate higher concentration of Fe2+ ions at steady state in presence of migration as compared to concentration of Fe2+ ions in absence of migration throughout the concentration boundary layer of Fe2+ ions during electrolysis. This impact of migration leads to higher rate of oxidation of Fe2+ ions to Fe3+ ions at all rate constant values as compared to rate of oxidation of Fe2+ ions to Fe3+ ions in absence of migration.
Rate of oxidation of Fe2+ ions to Fe3+ ions under oxygen pressure follows first order kinetic equation as the concentration of Fe2+ ions in this work is 0.02 (M) or 1.1169g/l which is much lesser than 3g/l (at and beyond 3g/l concentration of Fe2+ ions, rate of Fe2+ ions oxidation is described by second order kinetic equation ).Limiting current condition has been assumed in this work.
(1) Guha S. Simulation studies on a rotating ring disk electrode system: role of supporting electrolyte in determination of relevance of ionic migration. AIChE Journal.2013;59(4):1390-1399
(2) Tomasz C, Witold AC. The oxidation of Fe (II) in aqueous sulphuric acid under oxygen pressure. Hydrometallurgy.1984;12:21-30.
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