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Computational study of the interplay between intermolecular interactions and CO2 orientations in type I hydrates

Pérez-Rodríguez, Martín and Vidal-Vidal, Ángel and Míguez, J. M. and Blas, Felipe Jiménez and Torré, Jean-Philippe and Piñeiro, Manuel M. Computational study of the interplay between intermolecular interactions and CO2 orientations in type I hydrates. (2017) Physical Chemistry Chemical Physics, 19 (4). 3384-3393. ISSN 1463-9076

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Official URL: https://doi.org/10.1039/C6CP07097C

Abstract

Carbon dioxide (CO2) molecules show a rich orientation landscape when they are enclathrated in type I hydrates. Previous studies have described experimentally their preferential orientations, and some theoretical works have explained, but only partially, these experimental results. In the present paper, we use classical molecular dynamics and electronic density functional theory to advance in the theoretical description of CO2 orientations within type I hydrates. Our results are fully compatible with those previously reported, both theoretical and experimental, the geometric shape of the cavities in hydrate being, and therefore, the steric constraints, responsible for some (but not all) preferential angles. In addition, our calculations also show that guest–guest interactions in neighbouring cages are a key factor to explain the remaining experimental angles. Besides the implication concerning equation of state hydrate modeling approximations, the conclusion is that these guest–guest interactions should not be neglected, contrary to the usual practice.

Item Type:Article
HAL Id:hal-02016471
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Total (FRANCE)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Other partners > Universidad de Huelva - UHU (SPAIN)
Other partners > Universidade de Vigo - UVIGO (SPAIN)
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Deposited On:12 Feb 2019 15:47

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