在金属有机框架中储存甲:当前记录,惊喜发现和挑战
Yang Peng1, Vaiva Krungleviciute, Ibrahim Eryazici
1NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA.
Journal of the American Chemical Society
|July 12, 2013
概括
金属有机框架 (MOF) 的HKUST-1显示了创纪录的甲吸收,达到能源部的目标. 高表面积的MOF是高效的气体储存的关键,尽管封装密度仍然是一个挑战.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 纳米技术 纳米技术
背景情况:
- 金属有机框架 (MOF) 是气体储存的有希望的材料,因为它们的可调节结构和高表面积.
- 高效的甲储存对于天然气应用和减少温室气体排放至关重要.
研究的目的:
- 评估六种主要的金属有机框架 (MOF) 材料的甲吸收特性.
- 确定满足或超过能源部 (DOE) 目前的甲储存目标的MOF.
- 了解MOF属性 (表面积,孔径) 和甲储存能力之间的关系.
主要方法:
- 对六种选择的MOF材料进行选和表征:PCN-14,UTSA-20,HKUST-1,Ni-MOF-74,NU-111和NU-125.这些材料包括:
- 在各种压力下测量室温体积和重量度甲吸收.
- 分析MOF表面积,孔积,密度和甲吸收性能之间的相关性.
主要成果:
- HKUST-1 展示了前所未有的室温体积甲吸收量 (230 cc ((STP) /cc 在 35 bar, 270 cc ((STP) /cc 在 65 bar),超过了以前的记录.
- 表面积和孔积较大的MOF表现出更好的甲吸收性能.
- NU-111实现了大约75%的重力度和体积度 DOE 目标.
- 在表面积和重力测量吸收,孔隙体积和逆密度之间观察到一个线性关系.
结论:
- HKUST-1 是甲储存应用的领先候选者,提供高体积吸收.
- 在MOF设计中最大化表面积和孔积对于实现高重力度和体积气体储存能力至关重要.
- 在不损害框架完整性的情况下,开发有效的MOF包装方法对于实际应用至关重要.
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