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Main Title Porosity, surface area and particle size effects of CaO reacting with SO2 at 1100ĂȘC /
Author Gullett, Brian Kent, ; Blom, J. A. ; Cunningham, R. T.
Other Authors
Author Title of a Work
Blom, John A.
Cunningham, Richard C.
CORP Author Acurex Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher U.S. Environmental Protection Agency, Air and Energy Engineering Research Laboratory,
Year Published 1988
Report Number EPA/600/J-88/344; AEERL-P-399; EPA-68-02-3988
Stock Number PB89-237127
Additional Subjects Calcium oxides ; Sulfur dioxide ; Absorbers(Materials) ; Porosity ; Area ; Particle size ; Surface chemistry ; Graphs(Charts) ; Reprints ; Air pollution control
Library Call Number Additional Info Location Last
NTIS  PB89-237127 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14 pages : illustrations ; 28 cm
The paper gives results of tests for the reactivity of calcium oxide (CaO) sorbents derived from calcium hydroxide (Ca(OH)2) and calcium carbonate (CaCO3) to gaseous sulfur dioxide (SO2) in a nitrogen atmosphere with a nominal 1100 C, entrained flow reactor and a solids residence time of 0.74 s. The research included direct examination of the combined effect of porosity, particle size, and surface area upon CaO conversion to calcium sulfate (CaSO4). Conversion was inversely related to the 0.20 to 0.35 power of particle size for diameters ranging from 0.77 to 12.1 micrometers. Increased initial surface area from 7 to 62 sq m/g led to higher conversions at all particle sizes, eliminating the possibility of gas film diffusion control. The conversion for both sorbent types is proportional to initial porosity. Substantial expansion of the sorbents during reaction was shown by achieving conversion levels much greater than theoretically possible, given the initial sorbent porosity, the larger-volume product, and an assumed constant particle size. This is contrary to most modeling assumptions, in which the reaction is limited or cut off by pore filling or pore plugging of the sorbent volume. (Copyright (c) 1988 Elsevier Publishers B.V.)
"Brian K. Gullett, project officer." Caption title. "Journal article: Reactivity of Solids, Vol. 6, pp. 263-275, 1988." "EPA/600/J-88/344." Microfiche.