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

✍ Scribed by U Simon; U Flesch; W Maunz; R Müller; C Plog

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
127 KB
Volume
21
Category
Article
ISSN
1387-1811

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✦ Synopsis

The effect of NH 3 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, NH 3 promotes proton conduction in H beta. This is reflected by an increase of the specific conductivity, which is directly proportional to the NH 3 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 NH 3 .

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