Macrokinetics of Hg0 Removal by a Vaporized Multicomponent Oxidant

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School of Environmental Science and Engineering, North China Electric Power University, Baoding071003, China
Cite this: Ind. Eng. Chem. Res. 2014, 53, 27, 10899–10905
Publication Date (Web):June 13, 2014
https://doi.org/10.1021/ie5009376
Copyright © 2014 American Chemical Society
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Abstract

The macrokinetics of Hg0 oxidation by a vaporized multicomponent oxidant (MO) that was composed of Fenton reagent, peroxyacetic acid (PAA), and NaCl was evaluated. The effects of various influencing factors on Hg0 oxidation were investigated, such as MO constitutions, MO pH, reaction temperature, and coexistence gases. The experimental results indicated that the ideal additives for Hg0 oxidation were NaBr, NaCl, NaClO, and PAA, whereas NaCl was more economical; the increasing pH of MO was unfavorable to Hg0 oxidation; SO2 and NO in the simulated flue gas exhibited a reverse effect on Hg0 oxidation, depending on their concentrations. The Hg0 oxidation conformed to a pseudo-first-order kinetics pattern under the experimental conditions. And the rate constants determined at 343–423 K fit the Arrhenius equation well, yielding an apparent activation energy of 14.3 kJ/mol. Meanwhile, the mechanism of Hg0 oxidation was also deduced.

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