= 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.
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