The role of free fall atmospheric dust in catalysing autoxidation of aqueous sulphur dioxide

doi:10.1016/0960-1686(92)90178-N

Atmospheric Environment. Part A. General Topics

Volume 26, Issue 4, March 1992, Pages 667-673

https://doi.org/10.1016/0960-1686(92)90178-N Get rights and content

Abstract

The results of atmospheric free fall dust catalysed S(IV) autoxidation in acetate buffered suspensions are in conformity with the rate law: $− d[S(IV)] dt = k_{6} [S(IV)] [H^{+}]^{1.30} + k_{7} [dust]^{0.42} [S(IV)]^{2} [H^{+}]^{1.36}$

All available evidence favours the catalytic activity of dust suspensions being due to leached metal ions. Fe(III) is the main suspect, which is in agreemnt with the chemical analysis of dust.

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These clay size dusts also travel longer distances and collect more pollutants and become more soluble (Bauer and Koch, 2005). Mechanisms for the oxidation of, for example, S(IV) oxides (SO2 (aq), HSO3−, SO32−) include surface catalysis (heterogeneous) and leached metal ion (homogeneous) reactions (Prasad et al., 1992; Rani et al., 1992; Madnawat et al., 1993). These very fine dust particles containing primary minerals, aluminosilicates, oxyhydroxides, calcite and organic material provide a support that could promote catalytic activity.
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The role of free fall atmospheric dust in catalysing autoxidation of aqueous sulphur dioxide

Abstract

Atmospheric Environment

Atmospheric Environment

Atmospheric Environment

Atmospheric Environment

Atmospheric Environment

Atmospheric Environment

Study of metal aerosol system as a sink of atmospheric SO2

J. atmos. Chem.

Kinetics and mechanism for the catalytic oxidation of sulfur dioxide on carbon in aqueous suspensions

J. phys. Chem.

Role of flyash in catalytic oxidation of S(IV) slurries

Envir. Sci. Technol.

Metal ion sulfur(IV) chemistry. 3. Thermodynamics and kinetics of transient iron(III)-sulfur(IV) complexes

Envir. Sci. Technol.

Catalytic oxidation of sulfur dioxide in aqueous suspensions of α-Fe2O3

J. phys. Chem.

Kinetics of heterogeneous autoxidation of sulphur dioxide in aerosols, droplets and aqueous suspensions. Environmental considerations

Study of metal aerosol system as a sink of atmospheric SO₂

Catalytic oxidation of sulfur dioxide in aqueous suspensions of α-Fe₂O₃