Journal
BULLETIN OF MATERIALS SCIENCE
Volume 23, Issue 2, Pages 141-145Publisher
INDIAN ACADEMY SCIENCES
DOI: 10.1007/BF02706556
Keywords
hydroxides; hydrotalcites; temperature programmed decomposition (TPD)
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Mass spectrometric analysis of gases evolved during thermal decomposition of divalent metal hydroxides, hydroxysalts and hydrotalcites show that all these compounds undergo dehydration in the temperature range 30 < T < 220 degrees C followed by decomposition at temperatures above 250 degrees. The latter step involves simultaneous deanation and dehydroxylation of the layers. Our observations conclusively prove that alternative mechanisms which envisage CO2 evolution due to deanation at lower temperatures proposed by Kanezaki to be wrong.
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