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To assess the effects of pre-oxidation on pore structures and fractal features of coal samples, pre-oxidized coals at various oxidation temperatures were prepared and compared. Pore structure parameters of coal samples were analyzed qualitatively and quantitatively using electron scanning microscopy (SEM) and N 2  adsorption. The pore volume of coal samples increased first and then decreased with the increase of oxidation temperature. Among them, the pre-oxidized coal at 150°C is the highest, which is 27.92% higher than the raw coal. The fractal features of coal samples were calculated by fractal theory. It was found that pre-oxidation makes pore fissures of coal samples develop with obvious pore expansion effect, which is more obvious at the higher pre-oxidation temperature. In addition, fractal dimension  D2of coal samples was increased by pre-oxidation, indicating that pore structures of pre-oxidized coal are more complex than those of raw coal.

Experimental study on the effects of pre-oxidation on the pore structure and fractal characteristics of coal