Record Display for the EPA National Library Catalog


Main Title Method for Variation of Grain Size in Studies of Gas-Solid Reactions Involving CaO.
Author Borgwardt, R. H. ; Roache, N. F. ; Bruce, K. R. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. ;Northrop Services, Inc., Research Triangle Park, NC.
Year Published 1986
Report Number EPA/600/J-86/041;
Stock Number PB86-196359
Additional Subjects Grain size ; Calcium oxides ; Sintering ; Air pollution control ; Stationary sources ; Gas solid reactions
Library Call Number Additional Info Location Last
NTIS  PB86-196359 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
The paper describes a method for varying grain size in studies of gas-solid reactions involving CaO. (Note: Introducing grain size as an independent experimental variable should contribute to improved understanding of reactions in porous solids.) Calcining 1 micrometer CaCO3 particles at maximum rate and moderate temperature (600-950 C) yields CaO with an initial B.E.T. surface area of 79 = or - 6 sq m/g, corresponding to a grain radius of about 110 A. The grain radius can be increased to any value up to at least 1800 A by controlled sintering preceding exposure to the reactive gas. At a given temperature, the grain size can be adjusted by: (1) stagnant sintering, (2) sintering with inert sweep gas, or (3) sintering with a sweep gas containing controlled concentrations of CO2. Techniques for measuring the reactivity as a function of grain size are demonstrated for the CaO/SO2 reaction.