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

Table 1

¹³C NMR peak attribution and relative content of YW samples.

Serial number	Peak type	Half peak width (ppm)	Chemical shift (ppm)	Relative area (%)	Peak position attribution
1	Gaussian	8.0	19	2.4	Aromatic methyl
2	Gaussian	11.2	32	3.51	Methylene, methylene
3	Gaussian	14.4	45	8.3	Seasonal carbon
4	Gaussian	4.1	107	0.5	Protonated aromatic carbon
5	Gaussian	15.4	126	63.7	Bridged aromatic carbon
6	Gaussian	9.3	141	7.8	Alkyl substituted aromatic carbon
7	Gaussian	9.5	200	5.2	Carboxyl carbon
8	Gaussian	7.4	208	5.5	Carbonyl carbon
9	Gaussian	10.0	215	3.0	Carbonyl carbon