The kinetics of sulfation of calcium oxide. [Quarterly] project status report, February 27, 1989--May 31, 1989

Technical Report · Sun Dec 31 04:00:00 EST 1989

DOI:https://doi.org/10.2172/10167950· OSTI ID:10167950

Sarofim, A F; Longwell, J P

Studies of the sulfation rate behavior show an initial fast rate followed by a rate decrease. It is generally agreed that product layer diffusion limitations are the explanation for this behavior. Many investigators tried to model this observed rate change, more or less successfully. No agreement has been reached, however, as to the value of the produce layer diffusivity. Hence, in this work we want to investigate the mechanism of this process. In addition to understanding the initial kinetics, two questions will be focused on. First, we should understand what is diffusing. It appears that the driving force for this diffusion phenomenon is not first order with the SO{sub 2} concentration in the gas. This would indicate that some other, intermediary step is occurring. The second question concerns the composition of the product layer. Different conditions at the start of the reaction were observed to produce different diffusion rates at a later stage. The microscopic appearance of the product layer also appeared to be different.

• Research Organization: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-89PC89754
• OSTI ID: 10167950
• Report Number(s): DOE/PC/89754--T6; ON: DE92018751
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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20 FOSSIL-FUELED POWER PLANTS
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
54 ENVIRONMENTAL SCIENCES
540120
AIR POLLUTION CONTROL
CALCIUM OXIDES
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
CHEMICAL REACTION KINETICS
CHEMICALS MONITORING AND TRANSPORT
DIFFUSION
LAYERS
NOXIOUS GAS AND PARTICULATE EMISSIONS
POROSITY
PROGRESS REPORT
SORPTIVE PROPERTIES
SULFATION
SULFUR DIOXIDE
WASTE MANAGEMENT