Kinetics of gas-solid reactions. Part I. High temperature carbon gasification. Part II. Fe/sub 2/O/sub 3/ catalyzed sorption of SO/sub 2/. Part III. Catalytic decomposition of nitrates to nitrogen
This research deals with gas-solid reactions, such as carbon gasification reactions, desulfurization of the flue gases, and denitrification of flue gases. In part I, a new technique was developed and used successfully to measure simultaneously the overall rate of reaction and the penetration depth for the C-CO/sub 2/ reaction in the temperature range 1300 C to 1600 C. A simple model was proposed to calculate the first order reaction rate constant and the pore diffusivity. In part II, a small amount of iron oxide coated on the surface of dolomite particles substantially increases both the reaction rate and the ultimate capacity for sulfur dioxide sorption. Although the iron oxide coating catalyzes the sulfation of Tymochtee dolomite, it has an inhibiting effect on Greer limestone. The interplay of two opposing effects - increase in the chemical rate and a decrease in pore diffusion rate due to pore plugging - has been demonstrated by experiments with pellets made from pulverized Greer limestone. In part III the catalytic denitrification of flue gases involves absorption of NO/sub x/ and O/sub 2/ with a metal or metal oxide forming nitrate, which is followed by decomposition of the nitrate at a higher temperature. In decomposition of the nitrate, NO is decomposed to N/sub 2/ in the pores of the product layer, where the NO concentration is about 3 orders of magnitude higher than that in combustion gases. The rate of NO decomposition is accordingly raised by several orders of magnitude over that in direct catalytic processes. A model has been proposed to predict the conversion of NO to N/sub 2/ on decomposition of Nitrate/Oxide mixtures.
- OSTI ID:
- 6347069
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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20 FOSSIL-FUELED POWER PLANTS
COAL GASIFICATION
CHEMICAL REACTION KINETICS
FLUE GAS
DENITRIFICATION
DESULFURIZATION
CARBON
CARBON DIOXIDE
CATALYTIC EFFECTS
DECOMPOSITION
DOLOMITE
GASIFICATION
IRON OXIDES
LIMESTONE
MATHEMATICAL MODELS
NITRATES
NITRIC OXIDE
NITROGEN
NITROGEN OXIDES
POROSITY
REMOVAL
SULFUR DIOXIDE
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
GASEOUS WASTES
IRON COMPOUNDS
KINETICS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
ROCKS
SEDIMENTARY ROCKS
SULFUR COMPOUNDS
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES
010404* - Coal
Lignite
& Peat- Gasification
010800 - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions