Synthesis and hydrogen storage studies of metal−organic framework UiO-66
Synthesis and hydrogen storage studies of metal−organic framework UiO-66
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DOI：
10.1016/j.ijhydene.2013.01.163
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发表时间：
2013-09
影响因子：
7.2
通讯作者：
Qiang Zhao;Wen Yuan;Jianming Liang;Jinping Li
中科院分区：
文献类型：
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作者：
Qiang Zhao;Wen Yuan;Jianming Liang;Jinping Li
金属−有机骨架UIO-66具有很高的化学和热稳定性。然而，制备具有良好结晶形态的锆基MOF是很困难的。在这里，我们在低温(50℃)下合成了高纯金属−有机骨架UIO-66。用X射线衍射仪、热重分析、氮气吸附和扫描电子显微镜对合成的样品进行了表征。用智能重量分析仪对其储氢容量进行了测量。结果表明，UIO-66是在尺寸为150−200 nm的八面体晶体中合成的，具有较高的比表面积(1358×m2/g)。合成的UIO-66即使在中等压力下也表现出显著的吸氢率，在77K和1.8 Mpa时吸氢量增加到3.35wt%。用巨正则蒙特卡罗模拟方法(GCMC)计算了氢在UIO-66分子筛上的吸附。模拟结果为实验结果提供了理论依据。
Metal−organic framework UiO-66 has high chemical and thermal stability. However, it is difficult to produce such Zr-based MOFs with good crystalline morphology. Here, highly pure metal−organic framework UiO-66 has been synthesized at low temperature (50 °C). The as-synthesized sample has been characterized by X-ray diffraction, thermogravimetric analysis, nitrogen adsorption, and scanning electron microscopy. Its hydrogen-storage capacity has been measured by means of an Intelligent Gravimetric Analyser. The results showed that UiO-66 was synthesized in octahedral crystals of well-defined sizes (150−200 nm) and had a high specific surface area (1358 m2/g). The as-synthesized UiO-66 showed a significant hydrogen uptake even at a moderate pressure, which increased to 3.35 wt% at 77 K and 1.8 MPa. A grand canonical Monte Carlo simulation (GCMC) has been employed to calculate the adsorption of hydrogen in UiO-66. The result of this simulation provided a theoretical foundation for the experimental results.