Removing sulfur dioxide by carbon monoxide reduction. [15 refs]
The feasibility of removing sulfur dioxide by carbon monoxide reduction in a fixed-bed catalytic reactor was investigated by the Bureau of Mines. The reduction rate of sulfur dioxide with carbon monoxide was significantly dependent upon the iron and alumina content of the mixed catalyst. Maximum catalytic activity was obtained with about 40 percent iron-alumina mixture with a nominal gas mixture of 10 percent carbon monoxide, 5 percent sulfur dioxide, and the balance nitrogen. The synergistic effect of this catalyst mixture was explained by a dual reaction site mechanism, with both iron and alumina augmenting their specific sites at their interparticle contacts. The catalytic activity also increased with decreasing catalyst pellet size. With 0.7-mm pellets, the entire pellet appeared to be catalytically active in a 2-gram catalyst bed. The apparent activation energy of the reaction was 18.3 kcal/mole in the temperature range of 350 to 600/sup 0/C. Carbonyl sulfide (COS) was produced by the interaction of carbon monoxide and sulfur. The amount decreased with decreasing CO concentration. The ratio of COS formed per SO/sub 2/ removed reached a maximum at about 400/sup 0/C. The reaction rate appeared to be independent of SO/sub 2/ concentration in the range of 0.2 to 16 percent. The rate, however, increased directly with the CO concentration in the range of 5 to 20 percent. The presence of CO/sub 2/ (<15 percent) had no appreciable effect on the rate. However, not over 0.5 percent oxygen could be tolerated. This method appears feasible for removing SO/sub 2/ from waste gas if the oxygen is removed prior to the catalytic SO/sub 2/ reduction process.
- Research Organization:
- Bureau of Mines, Twin Cities, MN (USA). Twin Cities Metallurgy Research Center
- OSTI ID:
- 7216240
- Report Number(s):
- BM-RI-7483
- Country of Publication:
- United States
- Language:
- English
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010800* -- Coal
Lignite
& Peat-- Waste Management
ACTIVATION ENERGY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMICAL REACTORS
CRYOGENIC FLUIDS
DESULFURIZATION
ELEMENTS
ENERGY
FEASIBILITY STUDIES
FLUE GAS
FLUIDS
GASEOUS WASTES
IRON
KINETICS
METALS
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
REACTION KINETICS
REDUCTION
REMOVAL
SIZE
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SYNERGISM
TRANSITION ELEMENTS
WASTES