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Oxidation of hydrophobic alcohols using aqueous hydrogen peroxide over amphiphilic silica particles loaded with titanium(IV) oxide as a liquid-liquid phase-boundary catalyst

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タイトル: Oxidation of hydrophobic alcohols using aqueous hydrogen peroxide over amphiphilic silica particles loaded with titanium(IV) oxide as a liquid-liquid phase-boundary catalyst
著者: Choi, Kwang-Min 著作を一覧する
Ikeda, Shigeru 著作を一覧する
Ishino, Satoru 著作を一覧する
Ikeue, Keita 著作を一覧する
Matsumura, Michio 著作を一覧する
Ohtani, Bunsho 著作を一覧する
キーワード: Liquid-phase oxidation
Hydrophobic alcohols
Asymmetric surface modification
Amphiphilic solid catalyst
Phase-boundary
Titanium
Leaching
発行日: 2005年 1月10日
出版者: Elsevier B.V.
誌名: Applied Catalysis A General
巻: 278
号: 2
開始ページ: 269
終了ページ: 274
出版社 DOI: 10.1016/j.apcata.2004.10.006
抄録: Phase-boundary catalysis (PBC), a new concept of a heterogeneous catalytic system for oxidation of various hydrophobic alcohols with aqueous hydrogen peroxide (H2O2), has been investigated. A part the external surface of silica (SiO2) particles loaded with titanium(IV) oxides was modified with hydrophobic alkyl groups to obtain amphiphilic particles, having both hydrophobic and hydrophilic surfaces on each particle. The amphiphilic particles were spontaneously assembled at interfaces between dual phase mixtures of aqueous solutions and water-immiscible organic compounds. Upon addition to a dual phase mixture of aqueous H2O2 and toluene-containing hydrophobic alcohols, these particles acted as an efficient catalyst for the reaction, to produce corresponding aldehydes and ketones selectively. Notable features of the PBC system are that the oxidation proceeds even without agitation and that only a few percent of titanium species was detected as dissolved species. Productions of aldehydes and ketones were also observed when titanium loaded SiO2 without modification with alkyl groups was employed for the reaction. However, a large amount of titanium loaded on the material was leached during the reaction. These results indicate that surface-covered alkyl groups not only bring about effective contact with hydrophobic alcohols in the organic phase but also give stability against leaching, leading to heterogeneous catalytic functions.
関連URI: http://www.sciencedirect.com/science/journal/0926860X
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/14643
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 大谷 文章

 

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