具有特别高容量的金属有机框架,可在室温下储存二氧化碳
Andrew R Millward1, Omar M Yaghi
1Materials Design and Discovery Group, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA.
Journal of the American Chemical Society
|December 22, 2005
概括
金属有机框架 (MOF) 具有出色的二氧化碳 (CO2) 储存能力. 一些MOF,如MOF-177,显示了创纪录的二氧化碳吸收,突出了它们在气体分离和储存应用中的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 化学 化学 化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 金属有机框架 (MOF) 是具有可调节结构的晶体多孔材料.
- 由于其高表面积和可调节的孔隙环境,MOF被研究用于气体储存和分离.
- 二氧化碳 (CO2) 捕获和储存是环境可持续性的关键领域.
研究的目的:
- 在室温和高压下研究各种MOF的二氧化碳储存能力.
- 分析二氧化碳吸附等热体,并将它们与MOF结构和特性相关联.
- 为了确定在气体分离和储存中的潜在应用,具有较高二氧化碳吸收率的MOF.
主要方法:
- 重力测量分析用于测量一系列MOFs (MOF-2,MOF-505,Cu3(BTC) 2,MOF-74,IRMOFs-11, -3, -6, -1,和MOF-177) 的CO2吸附等温度,最高可达42巴.
- 吸附异热体根据其形状被分类为I型或西格形.
- 研究了二氧化碳吸收,表面积,毛孔大小和功能组之间的关系.
主要成果:
- 除了具有Zn4O(O2C) 6集群的MOF外,所有MOF都呈现出I型CO2异热体.
- 含有Zn4O(O2C) 6集群的MOF显示出西格形异热体,阶段压力与孔径大小相关,表明气体分离的可能性.
- 在IRMOF-3中的氨基功能增强了CO2亲和力.
- 二氧化碳容量在3.2 mmol/g (MOF-2) 到33.5 mmol/g (MOF-177) 之间.
- 在多孔材料中,MOF-177实现了报告中最高的CO2容量 (147重量%) .
结论:
- MOFs在室温下显示出显著的二氧化碳储存能力.
- 同热体形状和阶段压力为MOF孔隙结构和气体分离潜力提供了洞察力.
- MOF-177是高容量二氧化碳存储的基准材料.
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