Analytical Sciences

Investigation on the Elimination Processes of Carbon Compounds in Hydrolysis Products of Aluminum Alkoxides by Evolved Gas Analysis-Mass Spectrometry

Takahisa TSUGOSHI, Masamichi FURUKAWA, Masayoshi OHASHI and Yasuo IIDA

National Industrial Research Institute of Nagoya, Hirate-cho, Kita, Nagoya 462-8510, Japan

The thermal degradation processes of the remaining substances in the hydrolysis product of aluminum alkoxide were investigated with evolved gas analysis-mass spectrometry (EGA-MS). Different patterns of the process were obtained from the hydrolysis products with various temperatures which give different products. Concerning boehmite as a 90ûÃ-hydrolysis product, the carbon compounds are eliminated below about 300ûÃ, before dehydration from AlOOH to Al₂O₃ upon heating. Whereas in the case of a boehmite+bayerite mixture as the hydrolysis product at room temperature, dehydration from Al(OH)₃ to Al₂O₃ takes place almost simultaneously with the elimination of carbon compounds below the temperature of dehydration from AlOOH to Al₂O₃. (Keywords: Aluminum alkoxide, hydrolysis product, sol-gel method, evolved gas analysis, mass spectrometry)

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