Molecular sieving of linear and branched C-6 alkanes by tannin-derived carbons

Castro-Gutierrez J, De Oliveira Jardim E, Canevesi RLS, Silvestre-Albero J, Kriesten M, Thommes M, Celzard A, Fierro V (2021)

Publication Type: Journal article

Publication year: 2021


Book Volume: 174

Pages Range: 413-422

DOI: 10.1016/j.carbon.2020.12.061


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 C-6 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 C-6 isomers. (C) 2020 Elsevier Ltd. All rights reserved.

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Castro-Gutierrez, J., De Oliveira Jardim, E., Canevesi, R.L.S., Silvestre-Albero, J., Kriesten, M., Thommes, M.,... Fierro, V. (2021). Molecular sieving of linear and branched C-6 alkanes by tannin-derived carbons. Carbon, 174, 413-422.


Castro-Gutierrez, Jimena, et al. "Molecular sieving of linear and branched C-6 alkanes by tannin-derived carbons." Carbon 174 (2021): 413-422.

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