期刊
FUEL
卷 270, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.117499
关键词
Negative adsorption; Excess isotherms; Helium; Void volume; Methane
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Alberta Innovates
- Energi Simulation
- Energi Simulation/Frank and Sarah Meyer Collaboration Centre
- University of Calgary Beijing Research Site
- University of Calgary Global Research Initiative in Sustainable Low Carbon Unconventional Resources
- Kerui Group
- Science Foundation of China University of Petroleum, Beijing [2462018YJRC033]
A void volume, which is measured by helium expansion tests and used in the calculation of methane adsorption amounts, is always overestimated due to helium adsorption. In this study, by comparing void volumes of carbon nanopores determined under different temperatures and pressures using GCMC (Grand Canonical Monte Carlo) simulation, suitable experimental conditions for helium expansion tests are obtained. Five volumes, including one apparent volume V-app, three referred volumes V-ref and one physical volume V-phy, are recognized. The apparent volume V-app, corresponds to the volume directly determined under traditional experimental conditions, while three referred volumes are determined at 500 K with different pressure ranges (low, moderate, high). The physical volume is calculated by multiplying a pore width and a surface area. Besides, a volume determined by using a helium probe is named an accessible volume V-acc, and used as a criterion for a determined volume through mass balance. It is found that use of a void volume determined under traditional experimental conditions or a physical volume leads to negative adsorption amounts at high pressures. Considering an economic effect and measurement accuracy, determining a void volume by helium expansion tests within a moderate pressure range at 500 K is suggested. Excess isotherms of methane calculated by the suggested volume are more appropriate and of great physical meanings for further investigation of adsorption mechanisms.
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