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In this paper, the heterogeneity of adsorption pores in middle and high rank coal samples were analyzed by using low temperature N2 and CO2 adsorption technology and fractal theory. The following results were achieved. 1) According to the results of volume and surface fractal dimension, meso‐pores can be classified into Mep‐1, Mep‐2, and Mep‐3, respectively. Micro‐pore can be classified into Mip‐1,...