在金属有机框架中合作吸附的旋转过渡机制
Douglas A Reed1, Benjamin K Keitz1,2, Julia Oktawiec1
1Department of Chemistry, University of California, Berkeley, California 94720, USA.
Nature
|September 12, 2017
概括
研究人员开发了具有合作结合点的金属有机框架,以有效吸附一氧化碳 (CO). 这一突破为工业分离和化学转换带来了显著的能源效益.
科学领域:
- 材料科学
- 化学学
- 化学工程
背景情况:
- 在像血红蛋白这样的生物系统中观察到合作结合,初始结合增强了进一步的吸收.
- 与传统吸附剂相比,具有合作结合的多孔固体具有能量优势,但设计指南很少.
- 具有协调性不和金属中心的金属有机框架 (MOF) 是选择性和合作性吸附的潜在途径.
研究的目的:
- 在金属有机框架 (MOF) 中说明合作吸附的概念.
- 为选择性一氧化碳 (CO) 吸附设计和研究具有协调性不和铁的MOF.
- 展示推动合作结合的电子机制及其对吸附剂设计的影响.
主要方法:
- 一系列含有协调不和铁的金属有机框架 (MOF) 的合成.
- 研究合成的MOF的选择性一氧化碳 (CO) 吸附特性.
- 分析由CO结合引发的铁(II) 旋转状态转换的机制.
主要成果:
- 设计的MOF具有选择性吸附一氧化碳 (CO).
- 合作结合是通过一个机制实现的,邻近的铁 (II) 站点经历了超过值压力的旋转状态.
- 这些材料具有较大的二氧化碳分离能力,温度变化最小,再生能量低.
结论:
- 该研究表明MOF中可行的电子吸附机制.
- 开发的MOF显示了高效的Fischer-Tropsch转换和从工业废物中提取CO的潜力.
- 这种合作吸附的电子基础为设计各种分离应用的先进吸附剂提供了总体策略.
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