Absorption of sulfur dioxide from s 0 2 -N~ mixtures by manganese dioxide was studied a t temperatures from 573 to 723 K, with SO2 concentrations from 0.2 to 1 vol % and pellets of manganese dioxide 5/16 in. (7.94 mm), 3/8 in. (9.52 mm), and 7 /~~ in. (11.11 mm) in diameter. The absorption rate, the total pore volume, and the specific surface area of a reacted pellet all decreased with fractional conversion of oxide to sulfate. The maximum conversion observed was always less than 60%. Microscopic examinations of reacted pellets indicated that reaction was nontopochemical a t the temperatures studied. A model was proposed to describe the reaction kinetics, assuming the manganese dioxide pellet to consist of porous particles whose size remains unchanged during reaction. Equations were derived to relate the particle porosity and the specific surface area of a reacted pellet to conversion. The reaction was assumed to be irreversible and first order with respect to SO2 concentration and also proportional to the reacting surface area. The agreement between the model and experimental data was satisfactory. An activation energy of 10.3 f 0.8 kcal/g mol (4.3 f 0.3 X lo7 J/kg mol) was obtained.
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