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在低压波动过程中具有高可用的多变量灵活框架
Arijit Halder1, Ryan A Klein2,3, Sarah Shulda2
1Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States.
灵活的金属有机框架显示了阶梯形气体吸附以有效储存气. 一种新的多变量方法降低了压力要求,使燃料的实际输送成为可能.
科学领域:
- 材料科学
- 化学学
- 化学工程
背景情况:
- 灵活的金属有机框架 (MOF) 提供阶段式吸附-脱吸,非常适合储存和输送气体.
- 目前用于储存的MOF需要高压或较大的温度波动,因为物理吸收较弱.
- 设计新的灵活的MOF是一个挑战;调整现有框架是一个更可行的策略.
研究的目的:
- 展示多变量连接器方法来调整灵活的MOF的相变行为.
- 调整CdIF-13框架以提高吸附-脱吸特性.
- 这样才能有效地储存和输送像H$_{2}$这样的弱吸气体.
主要方法:
- 在CdIF-13框架中将2-甲基-5,6-二酶酸盐进行溶热结合.
- 创建一个多变量框架:SOD-Cd (胺酸盐) $_{1.87}${2-甲基-5,6-二胺酸盐) $_{0.13}$ (比率14:1).
- 在77K和87K时测量H$_{}$吸附-脱吸等温.
主要成果:
- 与原始框架相比,多变量MOF具有较低的分级吸附值压力.
- 在77K,H$_{2}$和发生在50bar以下,在5bar处出现最小的脱歇斯底里.
- 在87K时,度达到90bar,歇斯底里在30bar时关闭,使可用容量>1质量%.
结论:
- 多变量连接器方法有效调整MOF的灵活性和吸附行为.
- 经过修改的CdIF-13框架证明了在温和条件下有效的储存和交付.
- 这一策略有助于将现有灵活的MOF调整为实际应用的天然气储存.
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