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arXiv · 1908.00861

Scaling-up Simulations of Diffusion in Microporous Materials

Giovanni Pireddu·Federico G. Pazzona·Pierfranco Demontis·Magdalena A. Załuska-Kotur
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Abstract

We introduce and demonstrate the coarse-graining of static and dynamical properties of host-guest systems constituted by methane in two different microporous materials. The reference systems are mapped to occupancy-based pore-scale lattice models. Each coarse-grained model is equipped with an appropriate coarse-grained potential and a local dynamical operator, which represents the probability of inter-pore molecular jumps between different cages. Both the coarse-grained thermodynamics and dynamics are defined based on small-scale atomistic simulations of the reference systems. We considered two host materials: the widely-studied ITQ-29 zeolite and the LTA-zeolite-templated carbon, which was recently theorized. Our method allows representing with satisfactory accuracy and a considerably reduced computational effort the reference systems while providing new interesting physical insights in terms of static and diffusive properties.

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Giovanni Pireddu, Federico G. Pazzona, Pierfranco Demontis, Magdalena A. Załuska-Kotur. 2019-08-02. Scaling-up Simulations of Diffusion in Microporous Materials. https://arxiv.org/abs/1908.00861

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