灵活坚固的金属有机框架中的层间对称性控制,以实现高效的C2H2/CO2分离
Fang Zheng1,2, Rundao Chen1, Zexiang Ding1,2
1Key Laboratory of Biomass Chemical Engineering of the Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P. R. China.
Journal of the American Chemical Society
|September 4, 2023
概括
高纯度乙 (C2H2) 的生产需要去除二氧化碳 (CO2) 的杂质. 这项研究开发了一种2D金属有机框架吸收剂,用于高效的C2H2/CO2分离,实现高容量和选择性.
科学领域:
- 材料科学
- 化学工程
- 吸附科学
背景情况:
- 从二氧化碳 (CO2) 中有效分离乙 (C2H2) 对于生产高纯度乙至关重要.
- 开发可以区分C2H2和CO2的吸附剂,它们具有相似的动力直径,对于先进的吸附过程至关重要.
研究的目的:
- 为选择性C2H2/CO2分离设计和合成一种新的二维 (2D) 层金属有机框架 (MOF).
- 研究MOF中层间和层内空间的可调性,以提高吸附性能.
主要方法:
- 4-DPDS) 2CrO4的合成,这是4-DPDS) 2MO4 (M=Mo,W) MOF的同结构系列.
- 使用晶体学研究进行表征.
- 使用密度函数理论与分散校正 (DFT-D) 的计算分析.
- 气体分离性能评估的试验突破性测试.
主要成果:
- 4-DPDS) 2CrO4的高C2H2吸收率为45.7厘米3·g-1在0.01巴,对C2H2混合物的选择性为67.7在298K和1巴.
- 层间对称控制促进了MOF结构中的C2H2的有效包装.
- 量身定制的孔隙封闭和电子环境导致了与C2H2的强烈结合相互作用.
结论:
- 开发的2D MOF,Ni4-DPDS) 2CrO4,在C2/CO2分离方面表现出色,平衡工作能力和选择性.
- 在多层MOF中利用可调节孔隙的策略对于设计先进吸附剂是有效的.
- 这种材料在高纯度乙生产中具有重要的工业应用潜力.
相关概念视频
02:37Metallic Solids
18.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
18.5K
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.1K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.1K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
02:02Chair Conformation of Cyclohexane
14.8K
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.8K