Comparative study on physical adsorption of vapor and supercritical H 2 and CH 4 on SWNH and ACF

H. Tanaka, J. Miyawaki, K. Kaneko, K. Murata, D. Kasuya, M. Yudasaka, K. Kaneko, F. Kokai, K. Takahashi, D. Kasuya, M. Yudasaka, S. Iijima, S. Iijima

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Adsorption isotherms of H 2 and CH 4 on activated carbon fibers (ACF) and single-walled carbon nanohorns (SWNH) were measured at vapor and supercritical conditions. H 2 and CH 4 are adsorbed sufficiently on micropores of ACF and SWNH at the vapor conditions and their adsorption isotherms were described by the Dubinin-Radushkevich equation. This shows clearly that even adsorption of H 2 and CH 4 vapors can be described by micropore filling mechanism. However, the adsorption isotherms of supercritical H 2 and CH 4 sensitively depend on the measuring temperature; the higher the measuring temperature, the smaller the amount of adsorption. Although H 2 adsorption isotherm of SWNH at 77 K is of type I and the maximum surface excess adsorption is 0.7 wt.% at 5 MPa, the adsorption isotherm was of Henry type at 300 K and the adsorption amount is less than 0.1 wt.% at 5 MPa.

Original languageEnglish
Pages (from-to)[429]/15-[435]/21
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Issue numberPART 3
Publication statusPublished - 2002
Externally publishedYes
EventProceedings of the First International Symposium on Nanocarbons - Nagano, Japan
Duration: Nov 14 2001Nov 16 2001

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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