The adsorption model of the adsorption process of CH4 on coal and its thermodynamic characteristics

被引：11

作者：

Gao, Jiaxing ^{[1
,2
]}

Li, Xiangchun ^{[1
,2
]}

Shi, Yaoyu ^{[1
,2
]}

Jia, Suye ^{[1
,2
]}

Ye, Xinwei ^{[1
,2
]}

Long, Yuzhen ^{[1
,2
]}

机构：

[1] China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China

[2] State Key Lab Coal Resources & Safe Min, Beijing 100083, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2022年 / 632卷

关键词：

Isothermal adsorption; Adsorption model; Saturated vapor pressure; Surface potential; Gibbs free energy change; DUBININ-ASTAKHOV EQUATION; METHANE ADSORPTION; POTENTIAL-THEORY; CARBON-DIOXIDE; GAS-ADSORPTION; PRESSURE; SHALES; LANGMUIR;

D O I：

10.1016/j.colsurfa.2021.127766

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, the adsorption and desorption data of six coal samples with different volatile fraction contents were obtained using a laboratory-made adsorption and desorption system. The experimental temperature was 30 degrees C, and the adsorption pressure was 0-3.5 MPa. The fitting effects of four different calculation methods of saturated vapor pressure (P-0) (namely Reid method, Antoine method, Astakhov method, and Amankwah method) in applying three adsorption models (namely two-parameter BET model, three-parameter BET model, and D-A equation) were compared and analyzed. The D-A equation was reliable as an adsorption model when the Astakhov method was used to calculate P-0. When fitting the adsorption data of six coal samples, R-2 values were all greater than 0.99, and the obtained fitting parameters were all within a reasonable range. The Langmuir model and D-A equation were utilized to calculate the surface potential(Omega) and Gibbs free energy change (Delta G) of each coal sample. The D-A equation was more reliable to calculate Omega and Delta G, and it had some advantages in terms of calculation accuracy.

引用

页数：14

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