Fitting diagrams of coal samples of different coal ranks obtained using different models at different pressure sections.

(a) PH Sample, (b) JB Sample, (c) LH Sample. (Left: Langmuir and DA model, Right: Langmuir, DA, and BET models).</p

Curvature curves of the adsorption isotherms of coal samples of different coal ranks.

Curvature curves of the adsorption isotherms of coal samples of different coal ranks.</p

Differential curve analysis of the adsorption isotherms of different rank coal samples.

Differential curve analysis of the adsorption isotherms of different rank coal samples.</p

DA model analysis of the pore size distribution of the coal samples in the critical filling pressure range.

DA model analysis of the pore size distribution of the coal samples in the critical filling pressure range.</p

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N₂ adsorption/desorption isotherm analysis of coal samples with different coal ranks.

N2 adsorption/desorption isotherm analysis of coal samples with different coal ranks.</p

Fitting diagrams of coal samples of different coal ranks obtained using different models at different pressure sections.

(a) HG Sample, (b) CV Sample, (c) YW Sample. (Left: Langmuir and DA model, Right: Langmuir, DA, and BET models).</p

Main stages in the continuous filling of micropores during the adsorption process.

Main stages in the continuous filling of micropores during the adsorption process.</p

Cumulative pore volume and differential pore volume diagram of coals.

(a) PH Sample, (b) JB Sample, (c) LH Sample, (d) HG Sample, (e) CV Sample, (f) YW Sample.</p

Analysis results of coal samples with different coal ranks obtained using different adsorption models in different pressure regions.

Analysis results of coal samples with different coal ranks obtained using different adsorption models in different pressure regions.</p