Commensurate–incommensurate adsorption and diffusion in ordered crystalline microporous materials

Literature Information

Publication Date 2017-07-25
DOI 10.1039/C7CP04101B
Impact Factor 3.676
Authors

Rajamani Krishna, Jasper M. van Baten


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Abstract

For homologous series of linear chain molecules, there could be either a match, or mismatch, between the characteristic periodicity of the host structure and the characteristic length of the guest molecules. The major objective of this article is to highlight the influence of commensurateness, or incommensurateness, on both the adsorption and diffusion characteristics. Published experimental data, backed by molecular simulation results, are used to highlight the attendant non-monotonicity in adsorption strengths and diffusivities. We demonstrate the possibility of separating mixtures of n-alkanes, n-alcohols, and hydrocarbon isomers by appropriate and judicious choice of the dimensions, topology, and connectivity of the crystalline host material. Of particular practical interest are entropy-based separations that manifest at pore saturation conditions, relying on differences in the saturation capacities of the constituent species; the exploiting of such entropy effects is discussed with the aid of several examples.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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