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

被引：30

作者：

Miyawaki, J ^{[1
]}

Kanda, T ^{[1
]}

Kaneko, K ^{[1
]}

机构：

[1] Chiba Univ, Grad Sch Sci & Technol, Inage Ku, Chiba 2638522, Japan

来源：

LANGMUIR | 2001年 / 17卷 / 03期

关键词：

D O I：

10.1021/la000175m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：664 / 669

页数：6

共 32 条

[1] ANALYSIS OF HIGH-PRESSURE ADSORPTION OF GASES ON ACTIVATED CARBON BY POTENTIAL-THEORY [J].

AGARWAL, RK ;

SCHWARZ, JA .

CARBON, 1988, 26 (06) :873-887

[2] Water coadsorption effect on the physical adsorption of N2 and O2 at room temperature on carbon molecular sieve fibers [J].

Avraham, I ;

Danon, A ;

Koresh, JE .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1999, 1 (03) :479-484

[3] SOME ASPECTS OF THE SURFACE-CHEMISTRY OF CARBON-BLACKS AND OTHER CARBONS [J].

BOEHM, HP .

CARBON, 1994, 32 (05) :759-769

[4]

BOJYAN BP, 1996, ADSORPTION, V2, P57

[5] Theoretical and experimental studies of methane adsorption on microporous carbons [J].

Chen, XS ;

McEnaney, B ;

Mays, TJ ;

AlcanizMonge, J ;

CazorlaAmoros, D ;

LinaresSolano, A .

CARBON, 1997, 35 (09) :1251-1258

[6] MODELING FLUID BEHAVIOR IN WELL-CHARACTERIZED POROUS MATERIALS [J].

CRACKNELL, RF ;

GUBBINS, KE ;

MADDOX, M ;

NICHOLSON, D .

ACCOUNTS OF CHEMICAL RESEARCH, 1995, 28 (07) :281-288

[7]

Debenedetti P. G., 1996, METASTABLE LIQUIDS C

[8] THE SORPTION OF WATER VAPOUR BY ACTIVE CARBON [J].

DUBININ, MM ;

ZAVERINA, ED ;

SERPINSKY, VV .

JOURNAL OF THE CHEMICAL SOCIETY, 1955, :1760-1766

[9] WATER-VAPOR ADSORPTION AND THE MICROPOROUS STRUCTURES OF CARBONACEOUS ADSORBENTS [J].

DUBININ, MM .

CARBON, 1980, 18 (05) :355-364

[10]

DUBININ MM, 1966, CHEM REV, V60, P215

← 1 2 3 4 →