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dc.contributor.authorYang, Yafan
dc.contributor.authorNair, Arun Kumar Narayanan
dc.contributor.authorSun, Shuyu
dc.date.accessioned2020-07-15T07:13:45Z
dc.date.available2020-07-15T07:13:45Z
dc.date.issued2020-07-09
dc.identifier.citationYang, Y., Narayanan Nair, A. K., & Sun, S. (2020). Adsorption and Diffusion of Carbon Dioxide, Methane, and Their Mixture in Carbon Nanotubes in the Presence of Water. The Journal of Physical Chemistry C. doi:10.1021/acs.jpcc.0c04325
dc.identifier.issn1932-7447
dc.identifier.issn1932-7455
dc.identifier.doi10.1021/acs.jpcc.0c04325
dc.identifier.urihttp://hdl.handle.net/10754/664206
dc.description.abstractMolecular simulations were performed to investigate the adsorption and diffusion properties of methane and carbon dioxide in carbon nanotubes (CNTs) with preadsorbed water at 300 K and pressures up to 40 bar. Our results show that, at low pressures, a high uptake of methane and carbon dioxide is obtained in relatively small pores, and the presence of water enhances the adsorption of carbon dioxide in CNTs with large diameters. The effect of the preadsorbed water is more pronounced on the mobility of methane than that of carbon dioxide. Importantly, at high water contents, we see that the mobility of methane is a nonmonotonic function of the nanotube diameter. This is probably due to the splitting of the water clusters in the small pores which may lead to a faster diffusion process. Simulations were also performed for the methane/carbon dioxide mixture in CNTs with preadsorbed water. Here, the overall adsorption and diffusion properties are similar to those observed for the methane/water and carbon dioxide/water mixtures in CNTs. The adsorption selectivity of carbon dioxide over methane increases with water content which may be because of the relatively stronger water-carbon dioxide interactions. A significant result is that the mobility of methane in the CNTs decreases with decreasing bulk mole fraction of methane. In general, this decrease is more pronounced at higher loadings of methane and lower water contents. However, the presence of methane has less effect on the diffusion properties of carbon dioxide in the CNTs. These results may be explained by the preferential adsorption of carbon dioxide over methane in the CNTs. Furthermore, these simulated adsorption isotherms and diffusivity results are in reasonable agreement with the theoretical predictions based on the ideal adsorbed solution theory and the Krishna and Paschek approach, respectively.
dc.description.sponsorshipThis publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) O ce of Sponsored Research (OSR) under Award No. OSR-2019-CRG8-4074. Y.Y. and A.K.N.N. would like to thank computational support from KAUST.
dc.publisherAmerican Chemical Society (ACS)
dc.relation.urlhttps://pubs.acs.org/doi/10.1021/acs.jpcc.0c04325
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.jpcc.0c04325.
dc.titleAdsorption and Diffusion of Carbon Dioxide, Methane, and Their Mixture in Carbon Nanotubes in the Presence of Water
dc.typeArticle
dc.contributor.departmentComputational Transport Phenomena Lab
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalThe Journal of Physical Chemistry C
dc.rights.embargodate2021-07-09
dc.eprint.versionPost-print
kaust.personYang, Yafan
kaust.personNair, Arun Kumar Narayanan
kaust.personSun, Shuyu
refterms.dateFOA2020-07-15T07:14:37Z
kaust.acknowledged.supportUnitOSR
kaust.acknowledged.supportUnitSponsored Research
dc.date.published-online2020-07-09
dc.date.published-print2020-07-30


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