The application of dynamic X-ray diffraction to limestone sulfation

Thesis/Dissertation · Thu Dec 31 23:00:00 EST 1987

OSTI ID:6859153

Anderson, D E

The technique of Dynamic X-Ray Diffraction (DXRD) was refined and applied to study the kinetics and mechanistic route of limestone sulfation over a temperature range of 700 K to 1150 K and SO{sub 2} partial pressures from 0.3 to 1.6 kPa. The role of a Cr{sub 2}O{sub 3} promoter was also investigated and was found to increase the rate of sulfation by catalytic action. Global kinetics were diffusion limited for conversions in excess of approximately 20%, and solid-state diffusion coefficients with an activation energy of 65 kJ/mole were obtained for the product layer by applying a random pore model that accounts for the effect of pore plugging. The ability of DXRD to identify and quantify each solid phase among a mixture of phase also enable the kinetics of the solid-state disproportionation reaction of CaSO{sub 3} (CaSO{sub 3} {yields} 3/4 CaSO{sub 4} + 1/4 CaS) to be determined. It was found to be first order with respect to CaSO{sub 3} with an activation energy of 84 kJ/mole.

• Research Organization: Washington State Univ., Pullman, WA (USA)
• OSTI ID: 6859153
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBONATE ROCKS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COHERENT SCATTERING
DIFFRACTION
DIFFUSION
ENERGY
KINETICS
LIMESTONE
MATERIALS TESTING
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PROMOTERS
REACTION KINETICS
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SULFIDATION
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
TESTING
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION