Kinetics of the Oxidation of Sulfur Dioxide by Aerosols of Manganese Sulfate

Abstract

= thermal expansion coefficients (Equations 16 and 26), deg.? =(~'dp3'~, deg. -l cm.3I2 = dimensionless factor accounting for overlap of free volume = Lennard-Jones parameter for depth of potential well, ergs = bed void fraction, its average value, and value a t incipient fluidization, diniensionless = measured viscosity and its zero-shear limit, g./cm. sec. = bed thermal parameter and its average value (analogous to kT for molecular systems), ergs/part icle = viscosity of fluidizing medium or true liquid, g./cni. sec. = p / p f , kineiuatic viscosity, sq. em. per sec. = density of fluid and particle, g. per cc. = Lennard-Jones parameter for molecular di-= jump frequency for molecules, set.-' = nngular deflection measuring torque on vis-= visconieter spindle rotation rate, r.p.m. ameter, cni.cometer, deg.On the basis of a four-step reaction a mechanism is proposed for the catalytic oxidation of SO2 by aqueous aerosols of MnS04. Data were generated to permit the evaluation of the rate constants. A computer sohtion of the reaction rates indicates that the proposed model adequately explains the kinetics of the gasaerosol as well as the bulk phase situations. In principle the mechanism is applicable to reactions in which other metal-salt catalysts are involved.

Study of metal aerosol systems as a sink for atmospheric SO2

“…At rH > 96%, however, both SO2 and aerosol wall losses became uncontrollable. This result might call the previous data of Matteson et al (1969) in question which were obtained under similar conditions yet with less sensitive instrumentation and without a detailed study of wall deposition.…”

“…In previous dynamic flow studies either high SOs mixing ratios in the ppm-range were used (e.g., Matteson et al, 1969;Cheng et al, 1971;Cains and Carabine, 1978;Crump et al, 1983;Dlugi, 1983) or the data obtained were too scarce to be very informative (Kaplan et al, 1981). Our experimental set-up is very similar to that of Matteson et al (1969). However we have accomplished major improvements in the experiments themselves using up to three orders of magnitude lower SO2 and particle number concentrations.…”

Oxidation sulfur dioxide in polluted atmospheres. Review

“…The more recent work of Matteson et al (1969) is discussed here. The kinetics of the oxidation of SO, in aqueous aerosols of MnS04 was investigated.…”

A field investigation of physical and chemical mechanisms affecting pollutant concentrations in fog droplets

“…This could be expected because of the higher catalyst concentrations in haze droplets, and because both temperatures and SO,(g) concentrations usually peak in the afternoon. Oxidation of S(1V) in haze droplets should proceed along similar pathways as for fog droplets, and has been observed to proceed rapidly under controlled conditions (Matteson et al, 1969;Crump et al, 1983).…”