Entropy and enthalpy changes during adsorption and displacement of shale gas

doi:10.1016/j.energy.2021.119854

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	Entropy and enthalpy changes during adsorption and displacement of shale gas
	Lin K(林岿)1,2 ; Zhao YP(赵亚溥)1,2
通讯作者	Zhao, Ya-Pu([email protected])
发表期刊	ENERGY
	2021-04-15
卷号	221 页码:7
ISSN	0360-5442
摘要	Shale gas is a major component of the hydrocarbon economy, and there are abundant studies in related exploration and exploitation fields using simulations and experiments. In this paper, the kinetic processes of adsorption and displacement during shale gas exploitation are analyzed using enthalpy-driven and entropy-driven processes with molecular dynamics simulations and statistical mechanics analyses. First, the changes in symmetry of CH4 and CO2 adsorbed on the graphene surface are analyzed. The adsorption process is a spontaneous process, where the Gibbs free energy decreases. During this process, the gas molecular entropy and the enthalpy of the system decrease, which indicates an enthalpy-driven process. The changes in entropy and enthalpy of various gas molecules (CH4, CO2, N-2, and H2O) during the adsorption process are obtained. Through comparing the entropy and enthalpy changes before and after the displacement of CH4 by the different displacement media (CO2, N-2, and H2O). The CO2-injected displacement of CH4 is driven by both enthalpy and entropy, and the N-2-injected displacement of CH4 is driven by entropy. However, H2O-injected displacement of CH4 is not a spontaneous process. It plays a certain displacement role by reducing the partial pressure of CH4. To clarify the detailed spontaneous processes, the entropy change and exothermic processes during the supercritical fluid displacement of shale gas are discussed; then, the differences in displacement efficiency of different supercritical fluids are explained. This study is useful for understanding the kinetics mechanism of adsorption and displacement of shale gas. (c) 2021 Elsevier Ltd. All rights reserved.
关键词	Shale gas Adsorption/displacement Entropy change Enthalpy change Statistical mechanics
DOI	10.1016/j.energy.2021.119854
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000632506300004
WOS研究方向	Thermodynamics ; Energy & Fuels
WOS类目	Thermodynamics ; Energy & Fuels
资助项目	National Natural Science Foundation of China (NSFC)[12032019] ; National Natural Science Foundation of China (NSFC)[11872363] ; National Natural Science Foundation of China (NSFC)[51861145314] ; Chinese Academy of Sciences (CAS) Key Research Program of Frontier Sciences[QYZDJSSWJSC019] ; CAS Strategic Priority Research Program[XDB22040401]
项目资助者	National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) Key Research Program of Frontier Sciences ; CAS Strategic Priority Research Program
论文分区	一类
力学所作者排名	1
引用统计	被引频次：41[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/86339
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Lin K,Zhao YP. Entropy and enthalpy changes during adsorption and displacement of shale gas[J]. ENERGY,2021,221:7.
APA	林岿,&赵亚溥.(2021).Entropy and enthalpy changes during adsorption and displacement of shale gas.ENERGY,221,7.
MLA	林岿,et al."Entropy and enthalpy changes during adsorption and displacement of shale gas".ENERGY 221(2021):7.

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