Hysteresis-associated pressure-shift-induced water adsorption in carbon micropores

Jin Miyawaki, T. Kanda, K. Kaneko

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The remarkable adsorption increase of water-preadsorbed microporous carbons of different micropore widths w under a water vapor atmosphere upon introduction of supercritical methane or argon was measured at 303 K. The adsorption increment reached a maximum 1-2 h after the introduction of supercritical gas, decreasing gradually to the equilibrium after about 80 h. The precise quantitative analysis of gas-phase components after and before the introduction of supercritical gas using gas chromatography showed that this uptake was ascribed to additional adsorption of water induced by the introduction of supercritical gas. A variety of experimental data lead to the following hysteresis-associated adsorption mechanism of the water vapor. The transient compression of water vapor upon the introduction of supercritical gas gives rise to an increase of the partial pressure of water near the microporous carbon, inducing a predominant adsorption along the adsorption isotherm of water. Upon relaxation of the transient compression, additionally adsorbed water is desorbed along the desorption scanning curve.

Original languageEnglish
Pages (from-to)664-669
Number of pages6
JournalLangmuir
Volume17
Issue number3
DOIs
Publication statusPublished - Feb 6 2001
Externally publishedYes

Fingerprint

Hysteresis
Carbon
Gases
hysteresis
Steam
Adsorption
adsorption
Water
carbon
shift
Water vapor
water
water vapor
gases
Argon
Methane
Adsorption isotherms
Gas chromatography
Partial pressure
gas chromatography

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Hysteresis-associated pressure-shift-induced water adsorption in carbon micropores. / Miyawaki, Jin; Kanda, T.; Kaneko, K.

In: Langmuir, Vol. 17, No. 3, 06.02.2001, p. 664-669.

Research output: Contribution to journalArticle

Miyawaki, Jin ; Kanda, T. ; Kaneko, K. / Hysteresis-associated pressure-shift-induced water adsorption in carbon micropores. In: Langmuir. 2001 ; Vol. 17, No. 3. pp. 664-669.
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