Abstract
The initial reactivity of char with CO/sub 2/ was correlated with char composition by an equation involving the CaO and O/sub 2/ content of the chars. The pyrolysis technique employed to obtain the char can change the oxygen content by a factor of 2, in going from pyrolysis at 900/sup 0/C (2 min.) to pyrolysis at 1000/sup 0/C (30 min.). The surface area also changes. It appears that the ''available'' surface area does affect the rate; reactivity changes with char conversion were roughly proportional to changes in surface area (by CO/sub 2/ adsorption technique). Iron and magnesium are not important as catalysts; sodium and potassium were effective but were present only in low concentrations; therefore CaO was the only effective catalyst.
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