Methane adsorption on shales and application of temperature-related composite models based on dual adsorption modes

Autor:	Zhongqi Mu, Zhengfu Ning, Chunyu Ren
Rok vydání:	2022
Předmět:	Langmuir Materials science Composite number Thermodynamics Geotechnical Engineering and Engineering Geology Methane Entropy (classical thermodynamics) chemistry.chemical_compound Fuel Technology Adsorption Clausius–Clapeyron relation chemistry Monolayer Oil shale
Zdroj:	Journal of Petroleum Science and Engineering. 208:109379
ISSN:	0920-4105
DOI:	10.1016/j.petrol.2021.109379
Popis:	There are some controversies in shale gas about adsorption mechanisms and thermodynamics. This paper studied the adsorption of methane on two shale samples at pressures up to 20 MPa and temperatures in the range of 40–80 °C. Two composite models based on monolayer adsorption and filling of micropores were proposed and used for the fitting of the experimental isotherms under multiple temperatures. The fitting results show that the composite models lead to better fitting effects for isotherms and under low pressure compared to the Langmuir models thus being appropriate models for fitting. Using the composite models, the competition of two adsorption modes was investigated that the filling of micropores hardly appear until pressure rises to approximately 2 MPa. The isosteric heat and entropy change were determined by the Clapeyron equation and weighted average method, showing their dependence on the competition of two adsorption modes at different adsorbed amounts. These findings not only determine two novel models for describing shale gas adsorption but also reveal the adsorption process and associated thermodynamics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::79366fea2af41f09f0dd52f27dd03e80 https://doi.org/10.1016/j.petrol.2021.109379 Zobrazit plný text záznamu Full Text from ScienceDirect