Abstract
The role of microporous surface area in the CO 2 gasification of chars from a sub-bituminous coal was investigated. There is evidence that the reaction primarily takes place outside the microporous network on the surfaces of larger pores. The rate of gasification is insensitive to large changes in total surface area occurring during heat treatment or reaction. This behaviour is consistent with the occurrence of reaction on active sites lying preferentially outside the micropores. Mechanisms which can lead to an enhancement of the active site concentration on large pore surfaces are discussed.
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