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Activation parameters of ferryl ion reactions in aqueous acid solutions
Author(s) -
Jacobsen Frank,
Holcman Jerzy,
Sehested Knud
Publication year - 1997
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(1997)29:1<17::aid-kin3>3.0.co;2-o
Subject(s) - chemistry , dimer , yield (engineering) , activation energy , aqueous solution , reaction rate constant , hydrolysis , ion , kinetics , atmospheric temperature range , photochemistry , inorganic chemistry , organic chemistry , materials science , physics , quantum mechanics , meteorology , metallurgy
The temperature dependence of the oxidation kinetics of Fe 2+ by O 3 at pH 0–3 was studied by stopped‐flow technique in the temperature range 5–40°C. Activation parameters of the reactions involved in formation and decay of the ferryl ion (iron(IV)), FeO 2+ are determined. The reaction of Fe 2+ + FeO 2+ was found to branch into two channels forming iron(III)‐dimer, Fe(OH) 2 Fe 4+ , and Fe 3+ . The yield of the dimer, Fe(OH) 2 Fe 4+ , increases with temperature on the expense of the Fe 3+ yield. On the basis of the overall rate constant and relative yield of Fe(OH) 2 Fe 4+ the activation energy is determined for both channels. The activation parameters of the hydrolysis of the ferryl ion and its reaction with H 2 O 2 were also determined. © 1997 John Wiley & Sons, Inc. Int J Chem Kinet 29: 17–24, 1997.