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：103
|
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.
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页码：517 / 522
页数：6
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