Design of Colloidal and Supported Metal Nanoparticles: Their Synthesis, Characterization, and Catalytic Application

• Mori Kohsuke

  Div. of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

• Yamashita Hiromi

  Div. of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

Bibliographic Information

Other Title

• コロイド状および担持ナノ粒子の設計─その合成，構造解析と触媒作用─

Abstract

Fabrication of nanoparticle (NP)-based materials have attracted much attention in the field of catalysis, because their special properties lie between those of single metal species and bulks. In this review article, we highlight our recent progress in the development of promising NPs-based catalysts designed by precise architecture that enable efficient and selective chemical reactions and can be easily separated and recyclable. Firstly, novel strategies to fabricate well-controlled catalytically active metal NPs on solid supports are described. A single-site photocatalyst comprising tetrahedrally coordinated Ti-oxide moieties within a silica framework (Ti-MCM-41) enabled a high dispersion of metal NPs via the photo-excitation. Both the deposition of Pd and Au to form PdAu bimetallic NPs was also accomplished under UV-light irradiation. These bimetallic NPs showed an improvement in the catalytic efficiency of H₂O₂ formation. Based on pH-induced assembly-dispersion properties of Ag NPs stabilized with 3-mercaptopropionic acid (3-MPA), the deposition of Ag NPs on Al₂O₃ support was successfully attained by electrostatic attraction while keeping their inherent dispersion state. In the second topic, new multifunctional nanocomposites exhibiting magnetic properties and catalytic activities are presented. Magnetic NPs were encapsulated with silica layer containing isolated and tetrahedrally-coordinated Ti-oxide species, which offered simple and efficient catalyst systems for the selective liquid-phase oxidations. The Fe_corePt_shell NPs stabilized by oleic acid and oleylamine was drastically improved by the formation of an inclusion complex with γ-cyclodextrin (γ-CD), which showed an enhanced catalytic activity in water rather than in organic solvents. Similarly, the Fe_corePd_shell NPs were subsequently treated with 2,2’-bis(diphenylphosphino)-1,1’-binaphthene (BINAP) as chiral modifiers, which were shown to catalyze the asymmetric Suzuki-Miyaura coupling reaction. Hollow γ-Fe₂O₃ nanoshperes with diameter of 400-500 nm have been synthesized by a simple templating method combined with subsequent thermal treatments and calcinations. It exhibited higher catalytic activity than its bulk counterparts and also showed a satisfactory selectivity compared to the nano-γ-Fe₂O₃. The synthetic strategies described here are simple and general for practical catalyst design; thus allowing a strong protocol for creating various nanostructured catalysts.

Journal

• Journal of the Japan Petroleum Institute

  Journal of the Japan Petroleum Institute 54 (1), 1-14, 2011

  The Japan Petroleum Institute

Keywords

• Metal nanoparticle
• Supported catalyst
• UV-light irradiation
• pH-responsibility
• Magnetic property
• Surface modification

Details

• CRID: 1390001205188871296
• NII Article ID: 10027974586
• NII Book ID: AA11590615
• DOI: 10.1627/jpi.54.1
• ISSN: 1349273X
• ISSN: 13468804
• NDL BIB ID: 10930310
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I10930310
• Web Site: https://www.jstage.jst.go.jp/article/jpi/54/1/54_1_1/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed