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Kinetics of Catalytic Oxidation of Sulfite in Diluted Aqueous Solutions

“…The quality of initial mixing may have a crucial effect on the apparent reaction rate and kinetic parameters. According to the individual kinetic constants applicable for low pH values published by Ermakov and his co-workers [8][9][10], most of the reactions fall into a category of very fast reactions, the rate of which is close to the diffusion limit, supporting the importance of local micromixing on the apparent reaction rate.…”

“…Direct evidence of the radicals' presence during the course of the reaction has been often described, e.g., in [14,15]. A more detailed overview of possible reactions taking part in the mechanism and covering almost all sulfur-oxygen compounds was given by Ermakov and Purmal [8]. In spite of the complexity of the mechanism and pHdependent distribution of individual reaction species, many authors prefer a rather simplistic approach in modeling the reaction kinetics.…”

“…While these data are important for the industry and corrosion prevention, their application on mass transfer determination is uncertain as any excess of sulfite would compromise the determination. Detailed studies of the reaction kinetics at stoichiometric excess of oxygen are driven by the interest of atmospheric chemistry and they are limited only to pH values below 5 [8][9][10]. Under these conditions, sulfite is present mainly in the bisulfite form, which is regarded as about 50 times less reactive than the sulfite ion.…”

Intrinsic oxidation kinetics of sulfite catalyzed by peracetic acid under different water quality and light conditions

“…However, data of the intrinsic kinetics of sulfite oxidation are still scarce. Based on the uncatalyzed oxidation kinetics by Barron and other authors [2,3] , the macroscopic kinetics with catalysts of metal ions such as cobalt, manganese and ferrous was investigated respectively [4][5][6][7][8][9][10][11][12][13][14] . Although the catalysis effect of organic acids, which are cheap and cause little secondary pollution, has been studied by Zhao et al [15,16] , the mechanisms of the intrinsic reactions have not yet been investigated.…”

Onium Sulfates and Hydrogen Sulfates: Products of Reactions of Sulfur(IV) Oxide with Aqueous Solutions of Alkylamines and Aniline

“…The non-catalyzed auto-oxidation reactions of sulfurous compounds, most often, sulfur(IV) oxide, are of obvious interest for the theory and practice of chemical engineering processes [1][2][3]. For example, scavenging of sulfur(IV) oxide from gas-air mixtures by chemisorbents based on organic nitrogen bases in the presence of O 2 is accompanied by S(IV) → S(VI) oxidation [4].…”