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Journal Articles Carbon Year : 2021

Molecular sieving of linear and branched C6 alkanes by tannin-derived carbons

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Abstract

Two micro-mesoporous carbons (MMCs): a disordered mesoporous carbon (DMC) and an ordered mesoporous carbon (OMC), synthesized by an easy, low-cost, and green method are proposed as efficient hydrocarbon sieves for the separation of C6 isomers: n-hexane (nHEX), 2-methylpenthane (2 MP) and 2,2-dimethylbutane (22DMB). Their textural characterization reveals a highly interconnected pore network within the DMC, while a reverse hierarchy of ordered mesopores only accessible through narrow micropores is found in the OMC. The pore texture strongly affects their adsorption performance by kinetic and molecular sieving effects; the narrow constrictions in the OMC allow adsorption of nHEX and partially 2 MP but not 22DMB, whereas the highly connected pore network of DMC allows adsorption of the three isomers. Multi-component adsorption isotherms calculated from the single-component experimental results by ideal adsorbed solution theory (IAST) demonstrates that the OMC material has a remarkably high selectivity for the adsorption of nHEX and nHEX + 2 MP from binary and ternary mixtures, respectively. To the best of the authors’ knowledge, such behavior has never been reported so far for carbon materials. Hence, this study shows that tannin-derived MMCs have great potential to be used as an eco-friendly and low-cost alternative for the selective separation of di-branched C6 isomers
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Dates and versions

hal-03091665 , version 1 (02-03-2021)

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Attribution - NonCommercial - NoDerivatives - CC BY 4.0

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Jimena Castro-Gutiérrez, Erika de Oliveira Jardim, Rafael Luan Sehn Canevesi, Joaquin Silvestre-Albero, Martin Kriesten, et al.. Molecular sieving of linear and branched C6 alkanes by tannin-derived carbons. Carbon, 2021, 174, pp.413-422. ⟨10.1016/j.carbon.2020.12.061⟩. ⟨hal-03091665⟩
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