Adsorption-Induced Deformation of Zeolites 4A and 13X: Experimental and Molecular Simulation Study

Abstract
Gas adsorption in zeolites leads to adsorption-induced deformation, which can significantly affect the adsorption and diffusive properties of the system. In this study, we conducted both experimental investigations and molecular simulations to understand the deformation of zeolites 13X and 4A during carbon dioxide adsorption at 273 K. To measure the sample’s adsorption isotherm and strain simultaneously, we used a commercial sorption instrument with a custom-made sample holder equipped with a dilatometer. Our experimental data showed that while the zeolites 13X and 4A exhibited similar adsorption isotherms, their strain isotherms differed significantly. To gain more insight into the adsorption process and adsorption-induced deformation of these zeolites, we employed coupled Monte Carlo and molecular dynamics simulations with atomistically detailed models of the frameworks. Our modeling results were consistent with the experimental data and helped us identify the reasons behind the different deformation behaviors of the considered structures. Our study also revealed the sensitivity of the strain isotherm of zeolites to pore size and other structural and energetic features, suggesting that measuring adsorption-induced deformation could serve as a complementary method for material characterization and provide guidelines for related technical applications.

Citation
Emelianova, A., Balzer, C., Reichenauer, G., & Gor, G. Y. (2023). Adsorption-Induced Deformation of Zeolites 4A and 13X: Experimental and Molecular Simulation Study. Langmuir. https://doi.org/10.1021/acs.langmuir.3c01248

Acknowledgements
The authors thank Dr. Yafan Yang (King Abdullah University of Science and Technology) for providing an example of the simulation algorithm and Dr. Peter Ravikovitch (ExxonMobil) for useful discussions. This work was supported by the National Science Foundation (CBET-1944495 to G.Y.G.)

Publisher
American Chemical Society (ACS)

Journal
Langmuir

DOI
10.1021/acs.langmuir.3c01248

Additional Links
https://pubs.acs.org/doi/10.1021/acs.langmuir.3c01248

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