| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB86-196359 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
7p |
| Abstract |
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. |
