TY - JOUR
T1 - Comparative study on physical adsorption of vapor and supercritical H 2 and CH 4 on SWNH and ACF
AU - Tanaka, H.
AU - Miyawaki, J.
AU - Kaneko, K.
AU - Murata, K.
AU - Kasuya, D.
AU - Yudasaka, M.
AU - Kaneko, K.
AU - Kokai, F.
AU - Takahashi, K.
AU - Kasuya, D.
AU - Yudasaka, M.
AU - Iijima, S.
AU - Iijima, S.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) and Scientific Grant from the Ministry of Education, Science, Sports, and Culture, Japanese Government. *Corresponding author.
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
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U2 - 10.1080/10587250290113790
DO - 10.1080/10587250290113790
M3 - Conference article
AN - SCOPUS:19944407545
SN - 1542-1406
VL - 388
SP - [429]/15-[435]/21
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
IS - PART 3
T2 - Proceedings of the First International Symposium on Nanocarbons
Y2 - 14 November 2001 through 16 November 2001
ER -