Effect of water occupancy on the excess adsorption of methane in montmorillonites
Effect of water occupancy on the excess adsorption of methane in montmorillonites
复制标题
水占有率对蒙脱石过量吸附甲烷的影响
DOI:
10.1016/j.jngse.2020.103393
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发表时间:
2020-08
影响因子:
--
通讯作者:
Yang Mingli
中科院分区:
文献类型:
--
作者:
Wang Lin;Wang Dongbo;Cai Changhong;Li Nong;Zhang Li;Yang Mingli
Excess adsorption is usually used to measure the adsorption capacity for methane in porous clays and to compare with experiments. The commonly used definition of excess adsorption neglects water-occupied volume in moist clays. Such approximation leads to negative excess adsorption for nanoporous adsorbents with high water content, which is unphysical and deviates from experiments. Based on Monte-Carlo and molecular dynamics computations on montmorillonites with various slit apertures, a modified definition is proposed for the excess adsorption of methane in the nanoslit systems by taking the water-occupied volume into account. The modified model produces positive excess adsorption values that match better with the available observations.
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