Reaction between aluminium trichloride and steam in the vapor phase and properties of the aluminium oxide formed.
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概要
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The reaction between gaseous AlCl<SUB>3</SUB> and steam, and the products formed were examined by X-ray analysis, TG, DTA, and electron microscopy. The thermal transitions of the Al<SUB>2</SUB>O<SUB>3</SUB> formed under various conditions were also examined. The reaction between gaseous AlCl<SUB>3</SUB> and steam occurs even at 150 °C and proceeds rapidly above about 400 °C. The product is amorphous Al<SUB>2</SUB>O<SUB>3</SUB> below 600 °C, amorphous Al<SUB>2</SUB>O<SUB>3</SUB> containing poorly crystallized γ-Al<SUB>2</SUB>O<SUB>3</SUB> at 800 °C, γ-Al<SUB>2</SUB>O<SUB>3</SUB> containing amorphous Al<SUB>2</SUB>O<SUB>3</SUB> at 900 °C, and γ-Al<SUB>2</SUB>O<SUB>3</SUB> at 1000 °C. Also, it was observed that the Al<SUB>2</SUB>O<SUB>3</SUB> formed below 900 °C included a chloride oxide of aluminium, which decomposed in the vicinity of 830 °C to form γ-Al<SUB>2</SUB>O<SUB>3</SUB> with the evolution of gaseous AlCl<SUB>3</SUB>. On heating the amorphous Al<SUB>2</SUB>O<SUB>3</SUB> formed by the reaction between gaseous AlCl<SUB>3</SUB> and steam, the transition: amorphous \xrightarrow<I>ca.</I>700°C χ \xrightarrow<I>ca.</I>800°C κ \xrightarrow<I>ca.</I>1000°C α occurs; and on heating the γ-Al<SUB>2</SUB>O<SUB>3</SUB> formed by the same reaction, the transition: γ \xrightarrow<I>ca.</I>900°C δ \xrightarrow<I>ca.</I>1000°C θ \xrightarrow<I>ca.</I>700°C α occurs.
- 公益社団法人 日本化学会の論文
著者
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Saeki Yuzo
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Matsuzaki Ryoko
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Shoji Yuichi
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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