Hydrogen Storage Properties of Space-Confined NaAlH4 Nanoparticles in Ordered Mesoporous Silica

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• 作者：Shiyou Zheng ; Fang Fang ; Guangyou Zhou ; Guorong Chen ; Liuzhang Ouyang ; Min Zhu ; Dalin Sun
• 刊名：Chemistry of Materials
• 出版年：2008
• 出版时间：June 24, 2008
• 年：2008
• 卷：20
• 期：12
• 页码：3954 - 3958
• 全文大小：2185K
• 年卷期：v.20,no.12(June 24, 2008)
• ISSN：1520-5002

文摘

A method that is used by space-confining NaAlH₄ into the as-synthesized ordered mesoporous silica (OMS) is presented in the present work. NaAlH₄ in the pores of OMS is obtained by impregnation and drying techniques. It has been found that the space-confined NaAlH₄ in the pores of OMS shows the lower temperature and faster kinetics for dehydrogenation than that of the pristine NaAlH₄. Moreover, in the absence of a catalyst, the rehydrogenation in a dehydrogenated NaAlH₄ system with nanoscale particles and phases can be achieved even with the temperatures of 125−150 °C and the hydrogen pressures of 3.5−5.5 MPa. The physical limitation of the NaAlH₄ particles, as well as the resulting Al and NaH phases, to be nanoscale in size by the pores of OMS is believed to be responsible for these.