English  |  正體中文  |  简体中文  |  Items with full text/Total items : 54367/62174 (87%)
Visitors : 14160219      Online Users : 70
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTHU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    National Tsing Hua University Institutional Repository > 理學院 > 化學系 > 會議論文 >  Exploring the catalytic activity of metal nanoparticles in functionalized mesoporous silica

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/57885

    Title: Exploring the catalytic activity of metal nanoparticles in functionalized mesoporous silica
    Authors: Yang C;Wustefeld H;Kalwei M;Schuth F
    教師: 楊家銘
    Date: 2004
    Publisher: Elsevier
    Relation: 14th International Zeolite Conference,Cape Town, South Africa,Date of Conference,Elsevier,2004-04-25
    Keywords: GOLD CATALYSTS
    metal nanoparticles
    Abstract: The catalytic activitiy of highly dispersed metal nanoparticles in functionalized mesoporous silica SBA-15 prepared by a solution technique is demonstrated. The surface of SBA-15 was functionalized with positively charged groups, and anionic metal species were subsequently incorporated into the channel system via ion exchange. The anionic metal precursors were then reduced by either H-2 flow or by NaBH4 solution. Among the as-synthesized Au catalysts, two of them show activity for CO oxidation at room temperature. The most active Au catalyst was found to catalyse the reaction with a rate of 2.7x10(-4) mmol g(cat)(-1) s(-1), which is more active than any other silica-supported system made by a solution technique. On the other hand, supported Pd and Pd-Au nanoparticles in SBA-15 show capabilities as catalysts for Heck reactions. Buchwald-Hartwig-aminations and Suzuki-reactions are catalysed as well, but the yields, turnover-numbers (TONs) and turn-over-frequencies (TOFs) in these transformations are substantially lower than those of standard solution phase systems.
    URI: http://www.elsevier.com/
    Appears in Collections:[化學系] 會議論文

    Files in This Item:

    File Description SizeFormat


    SFX Query


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback