Methane Adsorption in Anthracite Coal under Different Pressures and Temperatures—A Study Combining Isothermal Adsorption and Molecular Simulation

Table 4

Regional content of oxygen-containing functional groups (the assignments of the FT-IR is according to [37]).

Chemical shift (cm^-1)	Relative area (%)	Peak position attribution
1012	0.77	C-O-C telescopic vibration
1031	4.54
1055	3.72
1078	3.95	C-O-C symmetric telescopic vibration
1099	5.22
1120	6.11
1164	6.14	R-O-C telescopic vibration
1202	0.46	Ar-O-C telescopic vibration
1316	0.92
1344	2.02	CH3 symmetrical bending vibration
1369	2.16
1385	2.28
1402	4.91	Asymmetric deformation vibration of CH3 and CH2
1427	3.13
1459	0.20
1500	1.06
1520	4.07	Aromatics C°=°C skeleton vibration
1547	37.83
1580	1.77
1631	2.06
1692	0.33	Stretching vibration of C°=°O in quinone and anhydride
1738	6.36