A Universal Descriptor for the Entropy of Adsorbed Molecules in Confined Spaces.

A Universal Descriptor for the Entropy of Adsorbed Molecules in Confined Spaces.
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DOI:
10.1021/acscentsci.8b00419
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发表时间:
2018-09-26
影响因子:
18.2
通讯作者:
Abdelrahman OA
Abdelrahman OA
中科院分区:
化学1区
文献类型:
--
作者:
Dauenhauer PJ;Abdelrahman OA

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Confinement of hydrocarbons in nanoscale pockets and pores provides tunable capability for controlling molecules in catalysts, sorbents, and membranes for reaction and separation applications. While computation of the enthalpic interactions of hydrocarbons in confined spaces has improved, understanding and predicting the entropy of confined molecules remains a challenge. Here we show, using a set of nine aluminosilicate zeolite frameworks with broad variation in pore and cavity structure, that the entropy of adsorption can be predicted as a linear combination of rotational and translational entropy. The extent of entropy lost upon adsorption is predicted using only a single material descriptor, the occupiable volume (Vocc). Predictive capability of confined molecular entropy permits an understanding of the relation with adsorption enthalpy, the ability to computationally screen microporous materials, and an understanding of the role of confinement on the kinetics of molecules in confined spaces. Entropy of adsorption is quantitatively predicted using a single material descriptor; less rotational entropy is retained in more confining environments, while translational entropy is unaffected.
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