Extension of the SAFT-VR-Mie equation of state for adsorption

Extension of the SAFT-VR-Mie equation of state for adsorption
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SAFT-VR-Mie 吸附状态方程的推广

DOI:
10.1016/j.molliq.2019.111639
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发表时间:
2019
影响因子:
6
通讯作者:
Cárdenas H
Cárdenas H
中科院分区:
化学2区
文献类型:
--
作者:
Cárdenas H

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提出了统计缔合流体理论(SAFT-VR-MIE)的经验扩展,以考虑柱状纳米孔内流体的限制效应。对状态方程的修改保留了原始公式中的体相限制,并增加了与受限流体亥姆霍兹能量贡献相对应的项。所得到的表达式采用了通过拟合整体流体行为获得的流体-流体参数,并增加了两个额外的可调参数,反映了固体-流体能量的强度和表面引力的范围。通过拟合甲烷和正−正庚烷在活性碳上的吸附等温线,乙烷、正−己烷和苯在MCM-41上的吸附等温线,以及甲烷和二氧化碳在页岩碳替代模型上的吸附等温线,验证了理论模型的能力;提供了与温度无关且稳健的参数的准确关联。基本模型的物理性质使其可以映射到流固分子模型,然后可以使用经典的分子模拟方法进行解析,从而提供了一条不仅可以探索吸附行为,而且还可以探索传输和界面性质的途径。
An empirical extension of the Statistical Associating Fluid Theory (SAFT-VR-Mie) is presented to take into account the effect of confinement of fluids within cylindrical nanopores. The modification of the equation of state retains the bulk phase limit presented in the original formulation and adds a term corresponding to the contribution to the Helmholtz energy of the confined fluid. The resulting expression employs the fluid-fluid parameters obtained from fitting bulk fluid behaviour and adds two additional adjustable parameters reflecting the strength of the solid-fluid energy and the range of the surface attraction. The capability of the theoretical model is showcased by fitting adsorption isotherms of methane andn−nonane on activated carbons; ethane,n−hexane and benzene on MCM-41, and methane and carbon dioxide on carbon surrogate models of shale rocks; providing for an accurate correlation of the data with parameters that are temperature-independent and robust. The physical nature of the underlying model allows it to be mapped to fluid-solid molecular models which can then be resolved employing classical molecular simulation methods, providing for an avenue into probing not only the adsorption behaviour but also the transport and interfacial properties.
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