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Detection of Side‐Products on Heavy Metal Loaded Zeolites of Type A (PbNaA Zeolite) (II)
Author(s) -
Steinike U.,
Jancke K.,
Schreier E.,
Staedler Chr.,
Lutz W.
Publication year - 1995
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170300423
Subject(s) - zeolite , aluminosilicate , zinc , metal , ion exchange , inorganic chemistry , chemistry , oxide , chemical engineering , materials science , ion , catalysis , organic chemistry , engineering
During the loading of aluminosilicate zeolites type A with heavy metal cations by ion exchange, hydroxides precipitate as permanent side‐products. Even smallest amounts of these surface deposits change the properties of the zeolite drastically, when transformed into a semiconductor composite. Their formation is detectable during the exchange process by means of in‐situ pH measurements. For zinc loaded zeolite A the detection succeeds also by means of XRD measurements. A change of the framework symmetry of zeolite A is observed under the influence of the framework adapted zinc oxide. A change of the framework symmetry from Fm‐3c to Fm‐3m is detected for lead loaded A zeolites, however, it is caused by hydrated lead cations.