Catalytic fluidized-bed combustion. Enhancement of sulfation of calcium oxide by iron oxide

Journal Article · Sat Jan 01 04:00:00 EST 1983 · Ind. Eng. Chem. Process Des. Dev.; (United States)

OSTI ID:5708136

Desal, N J; Yang, R T

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. All kinetic data were fitted with a pore closing model with a varying porosity in the product layer. For Tymochtee dolomite with 1.08% (by weight based on CaO) Fe/sub 2/O/sub 3/ coated on uncaicined stone, it has been shown, through a model, that for 90% sulfur retention a 40% reduction of the sorbent requirement can be achieved over the uncatalyzed case. Fluidization tests at 900/sup 0/C showed that no additional attrition of the sorbent particles was caused by the coated iron oxide.

• Research Organization: Department of Chemical Engineering, State University of New York at Buffalo, Amherst, New York 14260
• DOE Contract Number: AC22-80MC14617
• OSTI ID: 5708136
• Journal Information: Ind. Eng. Chem. Process Des. Dev.; (United States), Journal Name: Ind. Eng. Chem. Process Des. Dev.; (United States) Vol. 1; ISSN IEPDA
• Country of Publication: United States
• Language: English

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ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DOLOMITE
FLUIDIZATION
FLUIDIZED-BED COMBUSTION
HEMATITE
IRON COMPOUNDS
IRON ORES
IRON OXIDES
KINETICS
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
ORES
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLUGGING
POROSITY
ROCKS
SEDIMENTARY ROCKS
SULFIDATION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS