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Titolo:
The general equation of supercritical gas adsorption isotherm
Autore:
Murata, K; Kaneko, K;
Indirizzi:
Chiba Univ, Grad Sch Nat Sci & Technol, Chiba 2638522, Japan Chiba Univ Chiba Japan 2638522 h Nat Sci & Technol, Chiba 2638522, Japan Chiba Univ, Ctr Frontier Elect & Photon, Chiba 2638522, Japan Chiba Univ Chiba Japan 2638522 tier Elect & Photon, Chiba 2638522, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 36, volume: 105, anno: 2001,
pagine: 8498 - 8503
SICI:
1520-6106(20010913)105:36<8498:TGEOSG>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-PRESSURE ADSORPTION; DENSITY-FUNCTIONAL THEORY; ACTIVATED CARBON; MICROPOROUS ADSORBENTS; SIZE DISTRIBUTION; GLASS-TRANSITION; METHANE; RELAXATION; PORE; CLASSIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Kaneko, K Chiba Univ, Grad Sch Nat Sci & Technol, 1-33 Yayoi, Chiba 2638522, Japan Chiba Univ 1-33 Yayoi Chiba Japan 2638522 Chiba 2638522, Japan
Citazione:
K. Murata e K. Kaneko, "The general equation of supercritical gas adsorption isotherm", J PHYS CH B, 105(36), 2001, pp. 8498-8503

Abstract

We propose a new equation of the absolute adsorption isotherm for supercritical gas and examine the effectiveness of this equation using density functional theory (DFT). The new equation can well describe both DFT results and experimental data of a high-pressure adsorption isotherm of a supercritical gas. This equation provides important parameters of the averaged fluid-pore wall and fluid-fluid interaction energies, suggesting that adsorbed layer has two states. One is an attractive state in low-pressure region and another is a repulsive interacting state in high-pressure region. In the caseof DFT results of nitrogen adsorption on the regular slit pore of pore width = 2 sigma (sigma: Lennard-Jones size parameter of an adsorptive molecule), the obtained enthalpy change of this transition from Clausius-Clapeyron equation is 4.4 kJ/mol. It is slightly smaller than that of vaporization ofbulk liquid nitrogen at boiling point (5.57 kJ/mol).

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Documento generato il 08/07/20 alle ore 08:11:25