Acidic properties of Binary Metal Oxides
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概要
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Eighteen binary metal oxides consisting of TiO<SUB>2</SUB>–M<I><SUB>m</SUB></I>O<I><SUB>n</SUB></I>, ZnO–M<I><SUB>m</SUB></I>O<I><SUB>n</SUB></I> and Al<SUB>2</SUB>O<SUB>3</SUB>–M<I><SUB>m</SUB></I>O<I><SUB>n</SUB></I> (M<I><SUB>m</SUB></I>O<I><SUB>n</SUB></I>: metal oxide) were prepared by the usual co-precipitation method, their acid amounts and strengths being determined by <I>n</I>-butylamine titration using various acid-base indicators. The acid strengths of fourteen of the tested binary oxides of molar ratio 1 : 1 were found to be remarkably higher than those of the component single oxides. High acid strengths were as follows: <I>H</I><SUB>0</SUB>≤−8.2 for TiO<SUB>2</SUB>–SiO<SUB>2</SUB>, <I>H</I><SUB>0</SUB>≤−5.6 for TiO<SUB>2</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB> and <I>H</I><SUB>0</SUB>≤−3 for TiO<SUB>2</SUB>–CdO, TiO<SUB>2</SUB>–SnO<SUB>2</SUB> and ZnO–SiO<SUB>2</SUB>. The acid amounts of sixteen binary oxides were larger than those of the component oxides. The effect of the composition of binary oxides on acidity was examined for TiO<SUB>2</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB>, ZnO–Al<SUB>2</SUB>O<SUB>3</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB>. The acidity maxima appearing for TiO<SUB>2</SUB>–Al<SUB>2</SUB>O<SUB>3</SUB> and ZnO–Al<SUB>2</SUB>O<SUB>3</SUB> were found to be of molar ratio\simeq9:1 and for Al<SUB>2</SUB>O<SUB>3</SUB>–ZrO<SUB>2</SUB>\simeq3:2. A fairly good correlation has been demonstrated between the observed highest acid strengths and the average electronegativities of metal ions of binary oxides.
- 公益社団法人 日本化学会の論文
著者
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Sumiyoshi Takashi
Department Of Atomic Science And Nuclear Engineering Faculty Of Engineering Hokkaido University
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Tanabe Kozo
Department of Chemistry, Faculty of Science, Hokkaido University
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Kitagawa Jun
Central Research Laboratory, Mitsui Toatsu Chemicals, Inc.
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Shibata Katsue
Central Research Laboratory, Mitsui Toatsu Chemicals, Inc.
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Kiyoura Tadamitsu
Central Research Laboratory, Mitsui Toatsu Chemicals, Inc.
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Sumiyoshi Takashi
Department of Chemistry, Faculty of Science, Hokkaido University
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