Dielectric properties of faujasites: comparison between types X and Y during dehydration

被引：24

作者：

Abdoulaye, A

Zanchetta, JV

Di Renzo, F

Giuntini, JC

Vanderschueren, J

Chabanis, G

机构：

[1] Univ Montpellier 2, Lab Physicochim Mat Condensee, Equipe Chim Phys, CNRS,UMR 5617, F-34095 Montpellier 5, France

[2] Univ Moumouni, Fac Sci, Dept Chim, Niamey, Niger

[3] ENSCM, CNRS, UMR 5618, Lab Mat Catalyt & Catalyse Chim Organ, F-34296 Montpellier, France

[4] Univ Liege, Inst Chim Sart Tilman, B-4000 Liege, Belgium

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2000年 / 34卷 / 03期

关键词：

dehydration; dielectric properties; faujasite;

D O I：

10.1016/S1387-1811(99)00184-5

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The dielectric properties of two faujasites, X and Y, were studied in a wide range of frequencies (10-10(6) Hz) at several temperatures and for various outgassing temperatures TT (100-400 degrees C). Conductivity measurements were undertaken with the aim of describing the possible mechanisms of conduction in these materials. The polarization conductivity is ascribed to the cations in the large cages (supercages). The d.c. conductivity is related to the migration of the exchangeable cations over relatively large distances. The corresponding activation energies vary from 0.58 to 0.9 eV for NaX and from 0.61 to 0.85 eV for NaY. These energies vary with TT in a different way for each zeolite. Two relaxation domains, attributed to the cations on sites II and III', are a function of the dehydration temperature. The activation energies are 0.41-0.58 eV. These two processes are shown by the technique of the thermally stimulated currents-relaxation map analysis. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：317 / 325

页数：9

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