Thermal behaviour of hydroxides, hydroxysalts and hydrotalcites

Bulletin of Materials Science

关键词: Hydroxides;    hydrotalcites;    temperature programmed decomposition (TPD).;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

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°C followed by decomposition at temperatures above 250°C. 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.

【 授权许可】

CC BY