Calcium silicates: a new class of highly regenerative sorbents for hot gas desulfurization
A thermodynamic and kinetic study on the use of calcium silicates and silica-supported lime as regenerative sorbents for desulfurization of hot combustion gases showed that, except for ..gamma..-Ca/sub 2/SiO/sub 4/ and Ca/sub 3/SiO/sub 5/, all the calcium silicates and the silica-supported calcium oxide were as reactive as, or more reactive than, calcium oxide. The regeneration rates of these sorbents were substantially higher than that of calcium oxide, the rate of thermal decomposition of the sulfated mono- and dicalcium silicates being about 15 times higher than that of calcium sulfate. Sulfation rates of CaSiO/sub 3/ and Ca/sub 2/SiO/sub 4/ were first order with respect to sulfur dioxide only for partial pressure of sulfur dioxide Vertical Bar3; 3000 ppm. The silica-supported calcium oxide after heat treatment at 1075/sup 0/C had ..beta..-CaSiO/sub 3/ on its surface.
- Research Organization:
- Brookhaven Natl. Lab.
- OSTI ID:
- 6851053
- Journal Information:
- AIChE J.; (United States), Journal Name: AIChE J.; (United States) Vol. 25:5; ISSN AICEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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ADSORBENTS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CALCIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
COMPARATIVE EVALUATIONS
DATA
DECOMPOSITION
DESULFURIZATION
EVALUATION
EXPERIMENTAL DATA
FLUE GAS
GASEOUS WASTES
INFORMATION
KINETICS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SILICATES
SILICON COMPOUNDS
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMODYNAMICS
WASTES