The effect of NH3 on the ionic conductivity of dehydrated zeolites Na beta and H beta

被引：71

作者：

Simon, U

Flesch, U

Maunz, W

Muller, R

Plog, C

机构：

[1] Univ Essen Gesamthsch, Inst Anorgan Chem, D-45127 Essen, Germany

[2] Dornier Syst GmbH, Abt F2T, D-88039 Friedrichshafen, Germany

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 1998年 / 21卷 / 1-3期

关键词：

zeolite beta; ionic conductivity; ammonia; impedance spectroscopy; sensor;

D O I：

10.1016/S1387-1811(97)00056-5

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The effect of NH3 in concentrations up to 25 ppm on the electrical properties of the dehydrated forms of the zeolites Na beta and H beta was examined by use of complex impedance spectroscopy in a frequency range of 10 Hz-10 MHz and a temperature range of 400-723 K. Whereas the ionic conductivity of Na beta is unaffected, NH3 promotes proton conduction in H beta. This is reflected by an increase of the specific conductivity, which is directly proportional to the NH3 concentration, as well as by a decrease of the corresponding activation energy. A Grotthus-like conduction mechanism is supposed for the proton transport in the presence of NH3. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：111 / 116

页数：6

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