Molecular simulation of zeolite flexibility |
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Authors: | Marie Jeffroy Anne Boutin |
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Institution: | 1. IFP Energies Nouvelles, 1 et 4, Avenue de Bois-Préau, 92852, Rueil-Malmaison, France;2. Laboratoire de Chimie Physique, Université Paris Sud XI, Batiment 349, Orsay Cedex, France;3. Département de Chimie, CNRS-ENS-UPMC, UMR 8640, école Normale Supérieure, 24 rue Lhomond, 75005, Paris, France |
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Abstract: | We present a transferable force field able to model the structure of zeolites when different cation types are considered. Based on simple functional forms and interactions, it can be easily implemented in most common molecular simulation codes. The optimised force field is validated on structural properties (lattice parameters and Si–O–Al angles) for a large variety of zeolites, including faujasites of different Si/Al ratio and different extra-framework cation types (Li+, Na+, K+, Mg2+, Ca2+ and Co2+). The transferability of the force field was successfully tested on zeolites of different topologies such as FAU, LTA, MFI, FER and TON. The predictive capabilities of the potential were tested on structural deformations of alkaline earth Na, Co-X faujasites with different ion-exchange ratios. |
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Keywords: | zeolites force field lattice parameter structural deformation alkaline and alkaline earth cations |
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