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Study of the temperature stability of chabasite

✍ Scribed by D. Rykl; F. Pechar; V. Chalupský

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
293 KB
Volume
20
Category
Article
ISSN
0232-1300

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✦ Synopsis

Isotherninl decoii-rposition of chabasite was carried out a t temperatures of 20, 180, 400, 600, 735, 850 and 1000 "C with the aid of differential thermal analysis. The decomposition 1)roilucts were identified by X-ray powder diffraction antl infrared absorption spectroscopy.

It was found that the crystal structure of chahasite was stable in the whole range of t e m pratrires. Dehydration takes place a t a single stage. A change in lattice parameters, in intensity and splitting of X-ray diffraction lines takes place with increasing temperature. Dehydration corresponds t o the decrease in intensities of valence vibrations of OH, and the vanishing of librations and deformation vilirations of H,O. The residual water is heterolytically decomposed and forms striictural O H groups in the large ca\ ities of the iiiineral, which partly srirvive u p to 1000 "C.

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