Data processing of cation exchange equilibria in zeolites: a modified approach

被引:0
|
作者
Caputo, D
de Gennaro, B
Aprea, P
Ferone, C
Pansini, M
Colella, C
机构
[1] Univ Naples Federico II, Dipartimento Ingn Mat & Prod, I-80125 Naples, Italy
[2] Univ Cassino, Dipartimento Meccan Strutt Ambiente & Territorio, I-03043 Cassino, Italy
来源
OXIDE BASED MATERIALS: NEW SOURCES, NOVEL PHASES, NEW APPLICATIONS | 2005年 / 155卷
关键词
D O I
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中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
After reviewing the fundamental literature concerning the equilibrium of binary cation exchange reactions on zeolites, this paper provides a straightforward procedure of computation of their thermodynamic parameters, K-alpha and AGO, based on a method of evaluation of cations activity coefficients in solution, which is simple and accurate and is equipped with a sufficiently large data-base. The computation procedure was tested on isothermal equilibrium data of Cd2+ and Zn2+ exchange for Na+ in zeolite A at 25.0 degrees C and 0.05, 0.10, and 0.50 total normality, by calculating their K-alpha and Delta G degrees and by comparing these results to those obtained evaluating the cations activity coefficients through a reference largely used method and to previous literature data. The results obtained show that the proposed methods give results in good agreement with those obtained with the reference method so that it appears to be a good alternative for the determination of cation activity coefficients in solution.
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页码:129 / 140
页数:12
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