Hydrogen Storage Properties of Space-Confined NaAlH4 Nanoparticles in Ordered Mesoporous Silica
Hydrogen Storage Properties of Space-Confined NaAlH4 Nanoparticles in Ordered Mesoporous Silica
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DOI：
10.1021/cm8002063
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发表时间：
2008-05
影响因子：
8.6
通讯作者：
Shiyou Zheng;Fang Fang-Fang;Guangyou Zhou;Guorong Chen;L. Ouyang;Min Zhu;Dalin Sun
中科院分区：
文献类型：
--
作者：
Shiyou Zheng;Fang Fang-Fang;Guangyou Zhou;Guorong Chen;L. Ouyang;Min Zhu;Dalin Sun
本文介绍了一种将NaAlH4空间约束到有序介孔二氧化硅（OMS）中的方法。通过浸渍和干燥技术获得了OMS孔隙中的NaAlH4。研究发现，在OMS的孔隙中，有空间限制的NaAlH4比原始NaAlH4具有更低的脱氢温度和更快的脱氢动力学。此外，在没有催化剂的情况下，在温度为125 ~ 150℃，氢气压力为3.5 ~ 5.5 MPa的条件下，纳米级颗粒和相的脱氢NaAlH4体系也能实现再加氢。NaAlH4粒子的物理限制，以及由此产生的Al和NaH相，被认为是OMS孔的纳米级尺寸的原因。
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.