Citation: CHENG Wei-min, XU Cui-cui, ZHOU Gang. Evolution law of carbon and oxygen groups on coal surface with increasing metamorphic grade and its effect on wettability[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(3): 295-304. shu

Evolution law of carbon and oxygen groups on coal surface with increasing metamorphic grade and its effect on wettability

CHENG Wei-min ^1,2 ,
XU Cui-cui ^2,*,, ,
ZHOU Gang ^1,2

1.
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
2.
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Corresponding author: XU Cui-cui, xucuicui519@163.com
Received Date: 17 September 2015
Revised Date: 23 November 2015

Fund Project: Key Technology Projects of Chinese State Administration of Work Safety for Preventing Major Safety Production Accidents shandong-0083-2015AQSDUST Research Fund 2014JQJH106Qingdao City Huangdao District Technology Fund 2014-1-30National Natural Science Foundation of China 51474139China Postdoctoral Science Foundation 2015M570602National Natural Science Foundation of China U1261205

Figures(5)

Carbon and oxygen elements were studied to explore the effect of structural differences on wettability of coal dust. Surface distribution characteristics of carbon and oxygen groups in 6 coal dusts with different metamorphic grades were examined through NMR and XPS. The evolution of different types of carbon and oxygen groups was obtained using distance analysis. With increasing metamorphic degree a kind of group changes along with variation of other groups in most case, which is a process of clustering. The carbon in Ar-C, -COOH, CH₂ and Ar-O (R-O) has the similar evolution law, the oxygen in -OH and C-O-C is the same case. Factor analysis was used to know effect of group evolution on wettability of coal dust. It is found that Ar-C, as the common factor covering 95.366% to explain coal dust wettability (contact angle), is the main factor of carbon groups; while -OH covering 94.818% is the main factor of oxygen groups.
- coal dust,
- NMR and XPS,
- evolution of the groups,
- wetting influence degree
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