Comparison of parameters calculated from the BET and Freundlich isotherms obtained by nitrogen adsorption on activated carbons: A new method for calculating the specific surface area

被引：107

作者：

Passe-Coutrin, N. ^{[1
]}

Altenor, S. ^{[1
,2
]}

Cossement, D. ^{[3
]}

Jean-Marius, C. ^{[1
]}

Gaspard, S. ^{[1
]}

机构：

[1] Univ Antilles Guyane, Lab COVACHIMM, EA 3592, BP 250, F-97157 Pointe A Pitre, Guadeloupe, France

[2] Univ Quisqueya Haiti, Lab LAQUE, Port Au Prince, Haiti

[3] Univ Quebec Trois Rivieres, Inst Rech Hydrogene, Trois Rivieres, PQ GA9 5H7, Canada

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2008年 / 111卷 / 1-3期

关键词：

activated carbon; Freundlich isotherm; BET isotherm; specific surface area; fractal dimension;

D O I：

10.1016/j.micromeso.2007.08.032

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The empirical linear relationship between the BET surface area S-BET and the Freundlich constant K-F, calculated from nitrogen adsorption isotherms of activated carbons, S-BET = a(0)K(F) is mathematically demonstrated. This correlation exists in the relative pressure domain in which the BET equation is valid, whatever the value of c for the BET equation and for values of the Freundlich exponent, a, between 0 and 0.2. This study allows to determine the correlation factor a(0) = 1/a with a = 1/SN2N (alpha+1)(alpha+1)/alpha(alpha) From this result, a new expression, depending of a and KF, can be deduced for calculating the specific surface area. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：517 / 522

页数：6

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