Thermoanalytical studies of titanium(IV) acetylacetonate xerogels with emphasis on evolved gas analysis

Acik, I. O. and Madarász, János and Krunks, M. and Tonsuaadu, K. and Janke, D. and Pokol, György (2007) Thermoanalytical studies of titanium(IV) acetylacetonate xerogels with emphasis on evolved gas analysis. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 88 (2). pp. 557-563. ISSN 1388-6150

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Abstract

Thermal decomposition of precursor xerogels for TiO2, obtained by gelling of acetylacetonate-modified titanium(IV) tetraisopropoxide (prepared at Ti-alkoxide:acetylacetone molar ratios of 1:1 (Ti-1) and 1:2 (Ti-2)) in boiling 2-methoxyethanol, was monitored by simultaneous TG/DTA/EGA-MS and EGA-FTIR measurements. Thermal degradation processes of Ti-1 and Ti-2 in the temperature range of 30-700 degrees C consist of six mass loss steps, the total mass loss being 46.3% and 54.4%, respectively. EGA by FTIR and MS revealed release of H2O below 120 degrees C; followed by evolution of acetone and acetic acid between approximately 100 and 320 degrees C, and that of CO2 up to 560 degrees C. Acetylacetone is evolved to a significant extent from sample Ti-2 at 120-200 degrees C.

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