Epoxide rearrangement. VIII. The acidic and basic properties of TiO2-SiO2-MgO and its catalytic activities.
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概要
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Four kinds of TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–MgO having different molar ratios, TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–MgO (1 : 1 : 1, 10 : 10 : 1, 1 : 10 : 10, and 10 : 1 : 10), were prepared, their acidic and basic properties being examined by titration with butylamine and benzoic acid in benzene, respectively. The acidity of TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–MgO was attributed to that of TiO<SUB>2</SUB>–SiO<SUB>2</SUB> and SiO<SUB>2</SUB>–MgO. The amount of strong acid sites of <I>H</I><SUB>0</SUB>≤–5.6 decreased with the addition of MgO to TiO<SUB>2</SUB>–SiO<SUB>2</SUB>. The basicity of TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–MgO was attributed to that of TiO<SUB>2</SUB>–MgO and decreased with the increase in SiO<SUB>2</SUB> content. Catalytic activities for the isomerization of 1-butene and the decomposition of 4-hydroxy-4-methyl-2-pentanone are correlated with the acidity and basicity, respectively. For isomerization of 1-methylcyclohexene oxide and <I>d</I>-limonene oxide, TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–MgO and TiO<SUB>2</SUB>–SiO<SUB>2</SUB> showed high activities for the preferential formation of ketones except TiO<SUB>2</SUB>–SiO<SUB>2</SUB>–MgO (10: 1: 10) over which allyl alcohols were produced preferentially. The selectivities for the isomerization of two epoxides were interpreted in terms of the acidic and basic properties of the catalysts.
- 公益社団法人 日本化学会の論文
著者
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Arata Kazushi
Department Of Sciecne Hokkaido University Of Education
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ITOH MASAYOSHI
Department of Biotechnology, Faculty of Agriculture, Gifu University
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Hattori Hideshi
Department of Chemistry, Faculty of Science, Hokkaido University
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Tanabe Kozo
Department of Chemistry, Faculty of Science, Hokkaido University
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Yamada Teruaki
Department of Chemistry, Faculty of Science, Hokkaido University
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Arata Kazushi
Department of Chemistry, Hokkaido University of Education
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