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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27924

    標題: SiO2-supported ferromagnetic catalysts for hydrogen generation from alkaline NaBH4 (sodium borohydride) solution
    作者: Shih, Yu-Jen
    Su, Chia-Chi
    Huang, Yao-Hui
    Lu, Ming-Chun
    貢獻者: 環境資源管理系
    關鍵字: Porous Sio2
    Ferromagnetic Metals
    Cobalt Loading
    Hydrogen Generation
    Sodium Borohydride
    日期: 2013-06
    上傳時間: 2014-05-26 10:49:13 (UTC+8)
    出版者: Pergamon-Elsevier Science Ltd
    摘要: Ferromagnetic elements Fe, Ni and Co were immobilized on the porous SiO2 to catalyze the hydrogen generation from aqueous alkaline NaBH4 (sodium borohydride). The porous SiO2 was prepared by silica-surfactant self-assembly and the ferromagnetic catalyst was prepared by chemical reduction. The ferromagnetic catalysts were characterized using TG/DTA (Thermogravimetry/differential thermal analysis), BET, XRD (X-ray powder diffraction), ESEM/EDS (environmental scanning electron microscope/energy dispersive spectroscopy), XPS (x-ray photoelectron spectroscopy) and VSM (vibration sample magnetometer) measurements. The surface area of porous SiO2 was affected by the molecular weight of surfactant. The relative catalytic activities in the generation of hydrogen from alkaline NaBH4 solution follow the order Co/SiO2 > Ni/SiO2 > Fe/SiO2. The rates of hydrogen generation using Co/SiO2, Ni/SiO2 and Fe/SiO2 catalysts in 20 ml of 5 wt.% NaBH4 solution at 313 K were 8701, 307 and 130 ml min(-1) g(-1)-metal, respectively. It is found that the degree of metal-oxidation and crystal structure affected the catalytic activity. The hydrogen generation of NaBH4 in alkaline solution increased with increasing cobalt loading, of which the activation energy was 59 +/- 2 kJ mol(-1). (C) 2013 Elsevier Ltd. All rights reserved.
    關聯: Energy, v.54, pp.263-270
    Appears in Collections:[環境資源管理系(所)] 期刊論文

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