Thermal behaviour of layered double hydroxides studied by emanation thermal analysis

0163460 - UACH-T 20033008 RIV CH eng J - Journal Article
Dorničák, V. - Balek, V. - Kovanda, F. - Večerníková, Eva
Thermal behaviour of layered double hydroxides studied by emanation thermal analysis.
Solid State Phenomena. 90-91, - (2003), s. 475-480. ISSN 1012-0394
Institutional research plan: CEZ:AV0Z4032918
Keywords : hydrotalcite * layered double hydroxides * thermal decomposition
Subject RIV: CA - Inorganic Chemistry
Impact factor: 0.687, year: 2003

Thermal behaviour of the Mg-Al, Co-Al, and Ni-Al hydrotalcite-like compounds was studied during heating in air in the temperature range 20-1100 degreesC using the emanation thermal analysis (ETA), which is based on the measurement of the radon release rate from the samples previously labeled. The release of interlayer water followed by the dehydroxylation of hydroxide layers and decomposition of interlayer carbonate anions were observed during samples heating. Thermal decomposition of samples was accompanied by the sharp increase of surface area and radon release rate, which then decreased with increasing temperature as crystallization of formed oxides took place. The ETA results were in a good agreement with results of thermal analysis (TG, DTA, EGA), X-ray diffraction and BET surface area measurements.
Permanent Link: http://hdl.handle.net/11104/0060702