The vapor-phase reaction of aliminium trichloride with oxygen in the presence of steam and properties of the aluminium oxide formed.
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概要
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The reaction of gaseous AlCl<SUB>3</SUB> with oxygen containing 2–5 vol% H<SUB>2</SUB>O in the temperature range of 200 to 1000 °C, and the thermal transitions of the Al<SUB>2</SUB>O<SUB>3</SUB> formed under various conditions were examined. At 200 °C, only the reaction of gaseous AlCl<SUB>3</SUB> with H<SUB>2</SUB>O occurs, regardless of the H<SUB>2</SUB>O content in oxygen. Above about 400 °C, the reactions of gaseous AlCl<SUB>3</SUB> with both H<SUB>2</SUB>O and oxygen occur, and all the AlCl<SUB>3</SUB> reacts at 1000 °C. The reaction with H<SUB>2</SUB>O mainly occurs below about 900 °C, and the reaction with oxygen mainly occurs at 1000 °C. Regardless of the H<SUB>2</SUB>O content in oxygen, the reaction 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 a mixture of γ-Al<SUB>2</SUB>O<SUB>3</SUB> and δ-Al<SUB>2</SUB>O<SUB>3</SUB> at 1000 °C. It was also observed that the Al<SUB>2</SUB>O<SUB>3</SUB> formed below 800 °C included a chloride oxide of aluminium. On heating the amorphous Al<SUB>2</SUB>O<SUB>3</SUB> formed by the reaction of gaseous AlCl<SUB>3</SUB> with oxygen containing 2–5 vol% H<SUB>2</SUB>O, the amorphous \xrightarrow<I>ca</I>.700°Cχ\xrightarrow<I>ca</I>.800°Cκ\xrightarrow<I>ca</I>.1000°Cα transition occurs; on heating the γ-Al<SUB>2</SUB>O<SUB>3</SUB> formed, the γ \xrightarrow<I>ca</I>.900°Cδ \xrightarrow<I>ca</I>.1000°Cθ \xrightarrow<I>ca</I>.1000°Cα transition 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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