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
Similar Records
Conversion of Hydrogen Sulfide in Coal Gases to Liquid Elemental Sulfur with Monolithic Catalysts
The Integration of a Structural Water Gas Shift Catalyst with a Vanadium Alloy Hydrogen Transport Device
Related Subjects
ALUMINIUM OXIDES
CATALYTIC EFFECTS
FLUE GAS
DESULFURIZATION
IRON
SULFUR DIOXIDE
REDUCTION
REMOVAL
ACTIVATION ENERGY
CARBON MONOXIDE
CATALYSTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTORS
FEASIBILITY STUDIES
NITROGEN
PARTICLE SIZE
SYNERGISM
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
FLUIDS
GASEOUS WASTES
KINETICS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SIZE
SULFUR COMPOUNDS
SULFUR OXIDES
TRANSITION ELEMENTS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management