Abstract
In this article, coal char gasification reactivity was correlated with the strong chemisorption of CO 2 at 300°C. Chars of as-received, demineralized, K and Fe loaded coals were prepared at 800°C, under high purity nitrogen. The CO 2 chemisorption method described in this article allows differentiation between two types of chemisorption that takes place at low temperatures: strong CO 2 chemisorption (irreversible) which is related to the presence of the active inorganic components of the char, and weak CO 2 chemisorption (reversible) which is because of the organic matter of the char. The char doped with K showed the highest CO 2 strong chemisorption and at the same time the highest reactivity in the CO 2 gasification, while the char loaded with Fe had the highest amount of weak chemisorption. It was found that total chemisorption (weak+strong) at 300°C depends on the CO 2 pressure of the analysis. The reactivity of the CO 2 gasification of the char was normalized using the value of the amount of CO 2 strongly chemisorbed at 300°C.
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