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Study relating to temperature stability of the Natural Laumontite Zeolite
Author(s) -
Rykl D.,
Pechar F.
Publication year - 1984
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.2170190417
Subject(s) - zeolite , dehydration , chemistry , anorthite , thermal stability , crystallography , thermodynamics , mineralogy , organic chemistry , physics , catalysis , biochemistry
On the basis of the DTA measurements, the natural laumontite zeolite has been subjected to thermal decomposition at temperatures of 20, 250, 420, 580, 750, and 1000°C. The decomposition products were identified by the X‐ray powder method (CuK α‐ ) and IR spectroscopy (Nujol). It has been determined that the crystal structure of laumontite is stable up to the temperatures of 250°C. The dehydration of the mineral that takes place has three phases. With the increasing temperature, besides the conserved laumontite basic lattice (up to 420°C), a new phase “X” (paraleumontite) is produced. At 1000°C the laumontite is transformed in anorthite. The following phenomena correspond to dehydration: The intensity decrease of the OH stretching vibration, vanishing of librations and H 2 O bending vibrations. The remaining water is hydrolytically split up and forms structural OH‐groups which partially outlast up to 1000°C.