Methane Adsorption Behavior and Energy Variations of Brittle Tectonically Deformed Coal under High Temperature and High Pressure.

17 In the research of Meng et al., comparisons of methane adsorption characteristics of primary structure coal and TDCs at 25, 35, and 45 °C indicated that the V L values of coal showed a trend of “mylonitized coal > granulitic coal > cataclastic coal > primary structure coal”. 18 Cheng et al. observed the insignificant differences of V L values between primary structure coal and TDCs and the significantly lower P L values in TDCs, which were considered to be the main reasons for the higher adsorption rate and capacity of TDCs at low adsorption pressure. 14 At present, knowledge on TDC’s methane adsorption characteristics was mostly obtained from methane adsorption experiments at room temperature, and the highest adsorption pressure is approximately 10 MPa.

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A large number of mercury injection experiments showed that the volume and specific surface area of macropores (with a diameter of >50 nm) of TDCs are higher than those of primary structure coal and mostly show an increasing trend with coal deformation. 8 − 10 The mesopore structures (with a diameter of 2–50 nm) of TDCs are more developed than primary structure coal as well. 8 , 11 Ju and Li 12 and Li 13 proposed that tectonic stresses can affect coal’s nanopores by changing its macromolecular structures.

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Similarly, as temperature rise inhibits the adsorption of methane on coal by increasing the kinetic energy of methane molecules, the Δγ showed a decreasing trend with the increase in equilibrium pressure.

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