Original scientific paper

https://doi.org/10.17559/TV-20160525151512

Variations in Adsorption of Two Step Solvent Extracted Vitrain and Their Coal Crystallites Response

Run Chen orcid.org/0000-0002-4932-4327 ; Low Carbon Energy Institute (Key Laboratory of Coal-based CO2 Capture & Geological Storage, Jiangsu Province), China University of Mining and Technology, Xuzhou 221008, China
Youyang Wang ; School of Resource and Geosciences (Key Laboratory of Coalbed Methane Resource & Reservoir Formation History, Ministry of Education), China University of Mining and Technology, Xuzhou 221008, China
Zhiyang Wang ; School of Resource and Geosciences (Key Laboratory of Coalbed Methane Resource & Reservoir Formation History, Ministry of Education), China University of Mining and Technology, Xuzhou 221008, China

Abstract

Adsorption capacity and crystallite characteristics of raw vitrains collected from western Guizhou and eastern Yunnan and their step extracted residues were analysed; the possible geochemical mechanism of methane adsorption on coal crystallite was discussed. The results show that the step extraction changes methane adsorption capacity on sample, and the change direction and magnitude depend on the coalification degree. The extraction also depolymerizes the coal crystallite. It is found that it has a synchronous relationship between the percent change of adsorption and the percent depolymerization of coal crystallite. It is suggested that the second coalification jump plays a key role on the percent change of methane adsorption and the percent depolymerization of crystallite. The crystallite depolymerization is an important reason that methane adsorption percent changes.

Keywords

adsorption capacity; coal crystallite; organic solvent; stepwise-extraction; vitrain

Hrčak ID:

202565

URI

https://hrcak.srce.hr/202565

Publication date:

28.6.2018.

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