期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 133, 期 2-3, 页码 621-629出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.01.026
关键词
Non-isothermal kinetics; Hi-Res/modulated-TGA; Sol-gel MgAl layered double hydroxides; Thermal analysis
资金
- Instituto de Ciencia y Tecnologia del Distrito Federal (ICyTDF), Mexico
Structural, thermal profiles and kinetic behavior of two different sol-gel samples of MgAl layered double hydroxides (LDHs) were studied. In situ FT-IR study was used to follow the chemical composition changes, and thermal evolution of specific chemical species in each stage was monitored with a dynamic sampling mass spectrometer (TPD-MS analysis). The identified gas products were mainly OH, H2O, CO2, and organic species, mainly C2H5, originated from the alkoxy groups. The thermal evolution of intercalated compounds occurred in at least four steps related to dehydration, dehydroxylation of layers, interlayer anion decomposition, shrinkage and collapse of the layered structure, and finally crystallization of spinel MgAl2O4. Kinetic analysis in terms of activation energy (Ea), suggest that decomposition mechanism is a complex process that involves decomposition of several species and phase transformations. (C) 2012 Elsevier B.V. All rights reserved.
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