Effect of carbon dioxide and nitrogen on the diffusivity of methane confined in nano-porous carbon aerogel

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • S. M. Chathoth
  • L. He
  • E. Mamontov
  • Y. B. Melnichenko

Detail(s)

Original languageEnglish
Pages (from-to)101-106
Journal / PublicationMicroporous and Mesoporous Materials
Volume148
Issue number1
Publication statusPublished - 15 Jan 2012
Externally publishedYes

Abstract

The microscopic diffusivity of methane (CH4) confined in nano-porous carbon aerogel was investigated as a function of added carbon dioxide (CO2) and nitrogen (N2) pressure using quasi-elastic neutron scattering (QENS). In the range of the external pressure of 1-2.5 MPa, the self-diffusivity of methane was found to increase with CO 2 pressure and remain practically unchanged in the N2 environment. Increasing mobility of methane with CO2 pressure suggests that the adsorbed CH4 molecules become gradually replaced by CO2 on the surface of carbon aerogel pores, whereas the presence of N2 does not induce the replacement. The molecular mobility of the methane, with or without added carbon dioxide and nitrogen, is described by the unrestricted diffusion model, which is characteristic of methane compressed in small pores. On the other hand, both nitrogen and carbon dioxide molecules in carbon aerogel, when studied alone, with no methane present, follow a jump diffusion process, characteristic of the molecular mobility in the densified adsorbed layers on the surface of the aerogel pores. © 2011 Elsevier Inc. All rights reserved.

Research Area(s)

  • Aerogel, Diffusivity, Methane, Neutron scattering

Citation Format(s)

Effect of carbon dioxide and nitrogen on the diffusivity of methane confined in nano-porous carbon aerogel. / Chathoth, S. M.; He, L.; Mamontov, E.; Melnichenko, Y. B.

In: Microporous and Mesoporous Materials, Vol. 148, No. 1, 15.01.2012, p. 101-106.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review