在微孔协调固体Mg3O2C-C10H6CO2中强的H2结合和选择性气体吸附
1Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
Journal of the American Chemical Society
|June 30, 2005
概括
研究人员合成了一种新的基于的金属有机框架 (Mg-MOF),其结构类似于基于的MOF. 这种新的Mg-MOF由于其选择性气体吸附特性,显示了气体分离技术的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
- 纳米技术纳米技术
背景情况:
- 金属有机框架 (MOF) 是具有可调节的多孔结构的晶体材料.
- 之前的研究集中在MOF中,其中包含重金属离子,如.
- 用更轻,更丰富的金属离子探索MOF对于可持续材料开发至关重要.
研究的目的:
- 使用离子合成和表征一种新的多孔金属有机框架 (MOF).
- 调查新的MOF和已知的MOF之间的结构类比.
- 评估合成的MOF的气体吸附和分离能力.
主要方法:
- 溶热合成的Mg3 ((NDC) 3 ((DEF) 4) (NDC = 2,6-纳甲碳酸盐,DEF = N,N-二甲基形式胺).
- 通过X射线衍射来确定晶体结构.
- 用于溶解研究的热重量测量分析.
- 气体吸附测量 (H2,O2,N2,CO) 在冷温度 (77和87K).
主要成果:
- 成功合成了Mg3 ((NDC) 3 ((DEF) 4),这是第一种含有Mg2+离子的多孔MOF.
- 框架结构类似于Zn3 ((NDC) 3 ((CH3OH) 2.2DMF.H2O,显示Mg2+可以替代Zn2+.
- 溶解产生微孔固体Mg3 (NDC) 3 ,其BET表面积为190m2/g.
- 观察到高的H2吸附度 (7.0-9.5kJ/mol) 和选择性吸附H2/O2超过N2/CO.
结论:
- 一种具有结构类似于Zn-MOFs的新型Mg-MOF已被合成.
- 解溶的Mg-MOF具有显著的孔隙性和选择性气体吸附特性.
- 这种材料在气体分离技术中的应用方面表现有前途.
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