Contribution of Ash Content Related to Methane Adsorption Behaviors of Bituminous Coals

Table 1

Proximate composition analysis of selected coal samples (mass fraction, %).

Sample	Ash; (dry basis)	Fixed carbon; (dry basis)	Volatile matter; (dry basis)	Moisture
A1	9.35	67.18	23.47	1.08
A2	11.89	66.24	21.87	1.19
A3	15.27	63.97	20.76	1.03
A4	21.24	57.85	20.91	1.03
A5	26.82	52.82	20.36	1.18
A6	30.04	51.10	18.86	1.16
A7	35.62	46.01	18.37	1.20
A8	43.57	39.38	17.05	1.36