Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment

Table 3

Ownership and content of organic carbon of different coal samples.

Coal samples	Relative concentration ratio of different forms of organic C/%
	COO	C=O	C–O	C–H, C–C
Beizao lignite	9.22	3.85	20.37	66.56
Daliuta long flame coal	8.16	2.15	15.77	73.92
Yushuwan gas coal	4.85	3.26	10.18	81.71
Xinjulong fat coal	4.21	1.22	8.43	86.14
Wugou coking coal	5.34	4.17	7.09	83.4
Yangquan anthracite	3.05	2.88	10.92	83.15