Abstract
Calorimetry linked with GPC analysis has allowed the measurement of the heat of reaction against the oxygen coverage for three french coals ranging from subbituminous to semianthracite. At low oxygen coverage, a complex evolution of the enthalpy is observed mainly attributed to a chemisorption located on radical sites formed and accumulated during the outgassing pretreatment, whereas at higher coverage, the enthalpy becomes independent of the oxygen coverage where the removal of hydrogen as water vapour predominates. At low coverage the degassing pretreatments influence in a persistent way the enthalpy measurements, and in consequence it is generally only at high oxygen coverage, that enthalpy measurements coming from differently pretreated samples may be usefully compared.
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