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Modification of Zhaotong Lignite by Steam Explosion Treatment: Pore Structure and Oxygen-Containing Functional Groups

The pore structure and oxygen-containing functional groups of lignite play an important role in drying behavior, spontaneous combustion characteristics, and other applications of lignite. In this paper, Zhaotong lignite was modified by steam explosion (SE) technology. The changes in pore structure and fractal characteristics were analyzed by mercury intrusion porosimetry (MIP). The effect of SE modification on surface oxygen-containing functional groups was studied by Fourier transform infrared spectroscopy. Finally, the relationships between the water adsorption capacity of modified lignite and pore structure or oxygen-containing functional groups were investigated. The results indicated that the macroporous and mesoporous pore volumes of modified lignite can be increased to the greatest extent by SE modification at 130 °C. For transition pores and micropores, the maximum pore volume can be obtained by SE modification at 230 °C. The irregularity of the pore structure surface of modified lignite can be in...