Methane adsorption on graphene aerogel

  • Anastasia E. Memetova Tambov State Technical University, Tambov
  • Elena A. Neskoromnaya Joint Stock Company State Research and Design Institute of Rare Metal Industry “Giredmet” (AO Giredmet), Moscow
  • Andrey D. Zelenin Tambov State Technical University, Tambo
  • Alexander V. Babkin Joint Stock Company State Research and Design Institute of Rare Metal Industry “Giredmet” (AO Giredmet), Moscow
  • Nariman R. Memetov Tambov State Technical University, Tambov
  • Alena V. Gerasimova Tambov State Technical University, Tambov
DOI: https://doi.org/10.17308/sorpchrom.2022.22/9019
Keywords: adsorption, methane, graphene aerogel, thermodynamics, heat of adsorption, porous structure.

Abstract

The article studies methane adsorption on graphene aerogel over a wide range of pressures at temperatures above the critical value. In this study, we synthesized a carbon nanostructured material, which was an aerogel based on reduced graphene oxide. It was produced by supercritical treatment of the hydrogel in an isopropyl alcohol medium. The obtained adsorbent had a well-developed porous structure (S(BET)=657 m2/g; V(DFT)=0.766 cm3/g). This means it has good potential to be used for the adsorption of gases that are good sources of energy, in particular, methane. A large volume of mesopores with diameters of ~5.0 nm is a favourable factor for increasing the adsorption-desorption rate in such systems.

We studied the adsorption of methane on the obtained graphene aerogel at temperatures of 298.15, 303.15, and 313.15 K and pressures up to 100 bar. The maximum adsorption value was 7.31 mmol/g at 100 bar and 298.15 K. This article presents the results of calculations of methane adsorption on graphene aerogel at supercritical temperatures based on the theory of micropore volume filling by M.M. Dubinin. Experimental data on methane adsorption on graphene aerogel were analysed using the standard Dubinin-Radushkevich adsorption model in the temperature range of 298.15-313.13 K. The characteristic energy of adsorption of the studied gas (methane) on the graphene aerogel was in the range of 5.47-5.64 kJ/mol. This means that the adsorption of methane on the graphene aerogel is a physical adsorption process. Based on the obtained data, we calculated how the differential molar heat of adsorption of methane on graphene aerogel depends on the adsorption value at temperatures in the range 298.15-313.15 K. The heat of adsorption was 24 kJ/mol at all temperatures and then dropped to 9 kJ/mol at 6 mmol/g (298.15 K) and at 4 mmol/g (303.15-313.15 K). Such shape of the adsorption heat curves was probably due to the peculiarities of the porous structure of the adsorbent, its multimodality. From the molecular point of view, the very decrease in the heat of adsorption at high filling level is apparently due to the increase in repulsion energy between molecules in the adsorbate at small distances.

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Author Biographies

Anastasia E. Memetova , Tambov State Technical University, Tambov

Tambov State Technical University, Tambov

Elena A. Neskoromnaya , Joint Stock Company State Research and Design Institute of Rare Metal Industry “Giredmet” (AO Giredmet), Moscow

Ph.D., JSC "State Research and Design Institute of Rare Metal Industry" Giredmet"; JSC "Leading Scientific Research Institute of Chemical Technology" of the State Corporation "Rosatom", Moscow, E-mail: lenok.n1992@mail.ru

Andrey D. Zelenin , Tambov State Technical University, Tambo

leading engineer, Tambov State Technical University, Tambov, E-mail: zeleandrey@yandex.ru

Alexander V. Babkin, Joint Stock Company State Research and Design Institute of Rare Metal Industry “Giredmet” (AO Giredmet), Moscow

Ph.D., leading researcher, Tambov State Technical University, Tambov, JSC “State Research and Design Institute of Rare Metal Industry “Giredmet”, Moscow, E-mail: a.v.babkin93@yandex.ru

Nariman R. Memetov , Tambov State Technical University, Tambov

Ph.D., associate professor, Tambov State Technical University, Tambov, E-mail: memetov.nr92@mail.tstu.ru

Alena V. Gerasimova , Tambov State Technical University, Tambov

assistant of the Department "Technique and technology for the production of nanoproducts", Tambov State Technical University, Tambov, E-mail: alyona_gerasimova_92@mail.ru

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Published
2022-03-11
How to Cite
Memetova , A. E., Neskoromnaya , E. A., Zelenin , A. D., Babkin, A. V., Memetov , N. R., & Gerasimova , A. V. (2022). Methane adsorption on graphene aerogel . Sorbtsionnye I Khromatograficheskie Protsessy, 22(1), 41-49. https://doi.org/10.17308/sorpchrom.2022.22/9019
Issue
Vol 22 No 1 (2022): Sorbtsionnye i Khromatograficheskie Protsessy
Section
Статьи