结合有机框架的孔调节,以有效地分离烯
Youlie Cai1, Junkuo Gao1, Jing-Hong Li2
1School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018, China.
Angewandte Chemie (International ed. in English)
|July 24, 2023
概括
研究人员开发了新的结有机框架 (HOF) 用于选择性气体捕获. HOF-ZSTU-2 证明了高烯储存密度和有效地从气中分离出来.
科学领域:
- 材料科学 材料科学 材料科学
- 超分子化学 超分子化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 开发用于气体捕获的高性能结有机框架 (HOF) 需要精确控制它们的网络结构.
- 现有的调整HOF的策略在实现所需的功能性质方面缺乏有效性.
研究的目的:
- 设计和合成具有可调节毛孔结构的新型HOF,以增强气体分子捕获.
- 为了研究选择性烯 (C3H6) 吸附的HOF中的结构性质关系.
主要方法:
- 合成HOF-ZSTU-M (M=1,2,3) 使用四氧化 (TCPP) 和结构指导剂 (SDA).
- 单晶X射线衍射 (SCXRD) 用于结构分析和键的表征.
- 气体吸附测量,理论计算,以及用于结合分析的现场SCXRD.
- 动态突破测试用于分离效率评估.
主要成果:
- HOF-ZSTU-M系列展示了由SDAs控制的各种孔隙架构.
- HOF-ZSTU-2与NH4+形成了一个分层网络,并具有1D"珍珠链"通道.
- HOF-ZSTU-2在298 K和1 bar 的温度下实现了0.6 kg/L 的烯储存密度.
- 烯/的选择性达到了12.2,通过突破性测试证实了有效的分离.
结论:
- 通过SDA的战略引入,可以对HOF的结网络和孔隙结构进行微调.
- HOF-ZSTU-2是选择性烯捕获和储存的一个非常有前途的材料.
- 在HOF-ZSTU-2中的"珍珠链"通道促进了高效的C3H6吸附和分离.
相关概念视频
01:24π Molecular Orbitals of 1,3-Butadiene
9.2K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
9.2K
02:13Reduction of Alkenes: Catalytic Hydrogenation
12.2K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.2K
02:35Regioselectivity of Electrophilic Additions-Peroxide Effect
8.7K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
8.7K
02:34Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.5K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
8.5K
01:28Stability of Conjugated Dienes
3.4K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
3.4K
02:18Conformations of Ethane and Propane
14.1K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
14.1K