Table 2. Results of the Three-Parameter OK Model for Pure CH₄, CO₂, and N₂ Adsorption.

	T (K)	NPTSa	C (mmol/g)	ρmc (g/cm3)	–εis/k (K)	ARDb (%)	Δnex (mmol/g)	Unex (mmol/g)
CO2	293.73	10	1.213	0.575	1649	1.22	0.014	0.018
	311.17	11	1.089	0.378	1384	1.97	0.021	0.018
	333.06	11	1.087	0.306	1228	1.58	0.015	0.018
	352.74	11	1.031	0.205	950	2.03	0.017	0.017
CH4	293.81	14	0.782	0.309	1332	2.71	0.023	0.031
	311.14	14	0.750	0.287	1322	2.38	0.017	0.030
	333.14	14	0.729	0.299	1303	2.39	0.017	0.029
	352.88	13	0.709	0.223	1178	2.14	0.014	0.028
N2	293.71	13	0.786	0.808	958	4.56	0.025	0.026
	311.08	13	0.630	0.808	1042	0.77	0.004	0.026
	333.07	13	0.558	0.808	1057	0.58	0.002	0.025
	352.78	13	0.624	0.808	979	0.98	0.005	0.024

^aNPTS: number of data points estimated.

^bARD: average relative deviation: .