Synthesis of Nano-structured Materials Using Hybrid Mesoporous Templates and their Application to Advanced Catalytic Devices

混合介孔模板纳米结构材料的合成及其在先进催化装置中的应用

基本信息

  • 批准号:
    14340213
  • 负责人:
  • 金额:
    $ 9.41万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2002
  • 资助国家:
    日本
  • 起止时间:
    2002 至 2004
  • 项目状态:
    已结题

项目摘要

Nanoparticles and nanowires are key precursors to highly ordered, nanostructured materials in the bottom-up approach in nanotechnology. So far much work has been devoted to the synthesis and application of nanoparticles in magnetism, optics, electronics, separation and catalysis. However, the chemistry of nanowire is a new area, and the nanowires have attracted great interest in recent years due to potential unique properties based on the low-dimensionality. In the applications of nanowires, the chemical reactivity such as adsorption and catalysis is less explored. In this study, we have succeeded in synthesizing monometallic and alloy nanowires and nanoparticles in mesoporous silicas FSM-16, HMM, and thin film as a template. The nanowires and -particles were characterized by physicochemical methods ; the wires are 3 nm in diameter and 25 μm in length with high crystallinity. The mechanism for formation of Pt nanowires was studied, in which migration of precursor Pt ions in the mesopor … More ous channels is the key to growth of nanowires. The Pt wires in organosilica HMM-1 have a nanonecklace structure, while the wires in siliceous FSM-16 have a nanorod structure.As an application of nanowires and -particles in heterogeneous catalysis, we performed preferential oxidation (PROX) of CO in excess H_2 for PEM fuel cells. The Pt nanowires and nanoparticles in FSM-16 showed 80-100% CO conversion at 298-373 K, while Pt/HMM-1, Pt/Al_2O_3 and Pt/SiO_2 gave 10-20 % of CO conversion (Figure 2). Also CO selectivity was as high as 90-100% for the Pt/FSM-16 catalysts, indicating that the H_2+O_2 reaction is effectively suppressed. The Pt wires were extracted from FSM-16, and the wires were again deposited on the external surface of FSM-16. However, the resulting Pt/FSM-16 catalyst gave low catalytic activity, showing that the encapsulation of Pt in the mesopores is important for the PROX reaction. From the structural characterization by XAFS, XPS, IR and chemisorption, we propose that the high activity of Pt/FSM-16 is due to the electron-deficiency at the Pt surface, which enhances partial desorption of CO and adsorption of O_2 to give CO_2. Less
纳米粒子和纳米线是纳米技术中自下而上方法中高度有序的纳米结构材料的关键先驱。到目前为止,纳米粒子的合成及其在磁学、光学、电子学、分离和催化等方面的应用已经取得了很大的进展。然而,纳米线的化学是一个新的领域,基于低维的潜在的独特性质引起了人们对纳米线的极大兴趣。在纳米线的应用中,对吸附、催化等化学反应活性的研究较少。在本研究中,我们以介孔二氧化硅FSM-16、HMM和薄膜为模板,成功地合成了单金属和合金纳米线和纳米颗粒。用物理化学方法对纳米线和纳米粒子进行了表征,得到的纳米线直径为3 nm,长度为25μm,结晶度较高。研究了铂纳米线的形成机理,即前体铂离子在介孔…中的迁移更多的OU通道是纳米线生长的关键。有机硅HMM-1中的铂丝具有纳米链结构,而硅质FSM-16中的铂丝具有纳米棒结构,作为纳米线和纳米粒子在多相催化中的应用,我们对PEM燃料电池中的CO在过量H2中的优先氧化(PRX)进行了研究。在298-373K温度下,FSM-16中的铂纳米线和纳米颗粒具有80-100%的CO转化率,而铂/HMM-1、铂/Al_2O_3和铂/SiO_2的CO转化率为10-20%(图2)。催化剂上的CO选择性高达90-100%,有效地抑制了H_2+O_2反应。从FSM-16中提取铂丝,再将其沉积在FSM-16的外表面上。然而,所得到的铂/FSM-16催化剂的催化活性较低,这表明铂在介孔中的包裹对PROX反应是重要的。通过XAFS、XPS、IR和化学吸附等手段对催化剂的结构进行表征,我们认为催化剂的高活性是由于铂表面的缺电子,促进了CO的部分脱附和O_2的吸附生成CO_2。较少的

项目成果

期刊论文数量(114)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Surface Characteristics, "Morphology control of materials and nanoparticles" (Y. Waseda and A. Muramatsu eds.)
表面特性,“材料和纳米粒子的形态控制”(Y. Waseda 和 A. Muramatsu 编辑)
  • DOI:
  • 发表时间:
    2003
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Ken Sakai;Yosuke Konno;Noboru Takayama;Satoru Takahashi;A.Fukuoka
  • 通讯作者:
    A.Fukuoka
Y.Sakamoto: "Synthesis of Platinum Nanowires in Organic-Inorganic Mesoporous Silica Templates by Photoreduction : Formation Mechanism and Isolation"J.Phys.Chem., B. 108(3). 853-858 (2004)
Y.Sakamoto:“通过光还原在有机-无机介孔二氧化硅模板中合成铂纳米线:形成机制和分离”J.Phys.Chem.,B. 108(3)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
M.P.Kapoor: "Self-Assembly of Biphenylene-Bridged Hybrid Mesoporous Solid with Molecular-Scale Periodicity in the Pore Walls"J. Am. Chem. Soc.. 124(51). 15176-15177 (2002)
M.P.Kapoor:“孔壁中具有分子尺度周期性的联亚苯基桥杂化介孔固体的自组装”J。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Catalyst Preparation by Nana-Technology in Dictionary for Advanced Catalysis Part III
高级催化词典中的 Nana-Technology 催化剂制备第三部分
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M.Ichikawa;A.Fukuoka
  • 通讯作者:
    A.Fukuoka
金属細線包接薄膜及びその製造方法
细金属丝夹杂薄膜及其制造方法
  • DOI:
  • 发表时间:
    2002
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
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ISHIKAWA Masaru其他文献

ISHIKAWA Masaru的其他文献

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{{ truncateString('ISHIKAWA Masaru', 18)}}的其他基金

Performance Evaluation and Analysis of Japan-invested Firms in China
在华日资企业绩效评价与分析
  • 批准号:
    18530291
  • 财政年份:
    2006
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Centriolar Behavior and Flagellum Formation in Cell Culture System of Testicular Cells of the Sea Urchin
海胆睾丸细胞培养体系中的中心粒行为和鞭毛形成
  • 批准号:
    60540465
  • 财政年份:
    1985
  • 资助金额:
    $ 9.41万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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