Effect of water occupancy on the excess adsorption of methane in montmorillonites

Effect of water occupancy on the excess adsorption of methane in montmorillonites
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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
Yang Mingli
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Lin;Wang Dongbo;Cai Changhong;Li Nong;Zhang Li;Yang Mingli

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超额吸附通常被用来测量多孔粘土对甲烷的吸附能力,并与实验进行比较。通常使用的超额吸附的定义忽略了湿粘土中的水分体积。这种近似导致了高含水率的纳米孔吸附剂的负过量吸附,这是非物理的,与实验背道而驰。基于蒙脱石的蒙特卡罗和分子动力学计算,提出了考虑水体积的甲烷在纳米光催化体系中的过量吸附的修正定义。修正后的模型产生了正的超额吸附值,与现有的观测结果更好地匹配。
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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