Comparative study on physical adsorption of vapor and supercritical H 2 and CH4 on SWNH and ACF

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

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Adsorption isotherms of H2 and CH4 on activated carbon fibers (ACF) and single-walled carbon nanohorns (SWNH) were measured at vapor and supercritical conditions. H2 and CH4 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 H2 and CH4 vapors can be described by micropore filling mechanism. However, the adsorption isotherms of supercritical H2 and CH4 sensitively depend on the measuring temperature; the higher the measuring temperature, the smaller the amount of adsorption. Although H2 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
Volume388
Issue numberPART 3
DOIs
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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