Abstract
The effects of temperature, time, particle size and coal moisture content on heats of reversibly and irreversibly sorbed oxygen were studied separately using pulse flow calorimetry. The results of measurements performed on seven coal samples, ranging from subbituminous to low volatile bituminous, show that in coals of low porosity (open porosity less than ≈8%), the particle size affects the heat of the apparent physical adsorption of oxygen much more than that of chemical sorption. However, in two samples of high porosity (open porosity 25 and 28%), the heats of both physically and chemically sorbed oxygen were found to be independent of particle size. The heat of reversibly sorbed oxygen decreased with increase in moisture content, while the heat of irreversibly sorbed oxygen remained constant and even increased in highly hydrophilic samples. Comparison of coal surfaces occupied by adsorbed molecules of oxygen and coal surfaces occupied by a nitrogen monolayer (BET) shows that at ambient temperature, oxygen is able to penetrate even into those micropores of coal which are inaccessible to N 2 at −196 °C.
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