相关实验视频
Updated: Sep 16, 2025

09:31
Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
Published on: March 27, 2019
9.6K
对于基准N2/CH4分离,具有低极化性的吸位
Feifei Zhang1, Zhiwei Zhao1, Yating Wang1
1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China.
Angewandte Chemie (International ed. in English)
|July 8, 2025
概括
一个新的金属有机框架,Cu-MFU-4l,证明了 (N2) 从甲 (CH4) 中的优异选择性吸附. 这种材料为N2/CH4分离提供了高效的解决方案,在纯度和生产率方面实现了创纪录的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 吸附科学 吸附科学
背景情况:
- 将 (N2) 与甲 (CH4) 分离对于天然气净化至关重要,但由于它们的特性相似,因此具有挑战性.
- 现有的方法往往在效率和选择性方面扎,需要先进的吸附材料.
研究的目的:
- 开发和评估一种新的金属有机框架 (MOF),Cu-MFU-4l,用于选择性N2/CH4分离.
- 调查开放Cu (I) 位点在提高分离性能方面的作用.
主要方法:
- 使用X射线吸收光谱 (XAS),现场CO吸收红外光谱和X射线光电子光谱 (XPS) 合成和描述Cu-MFU-4l.
- 气体吸附异热测量以确定N2和CH4吸收能力和选择性.
- 评估二元和多元组合气体混合物分离性能的突破性实验.
- 现场红外光谱学和计算机建模以阐明选择性吸附的机制.
主要成果:
- -MFU-4l表现出高的N2/CH4吸收比率 (1.94) 和动力选择性 (2.20),超过了之前报告的MOF.
- 实现了创纪录的高突破选择性 (2.43) 和CH4生产率 (0.47 mmol g-1),用于二进制N2/CH4分离.
- 证明了从复杂的气体混合物中在单个步骤中生产高纯度CH4 (99.99%) 的能力.
- 证实开放的Cu (I) 位是区分N2和CH4分子的关键.
结论:
- -MFU-4l是用于选择性N2/CH4分离的高效吸附剂,与现有技术相比,它具有显著的优势.
- 在Cu-MFU-4l中开放的Cu(I) 位点在N2相对于CH4的优先吸附中发挥着关键作用.
- 这个MOF为高效的天然气升级和净化提供了一个有希望的途径.
相关概念视频
Analyte Adsorption and Distribution
870
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
870
Gas Chromatography: Types of Columns and Stationary Phases
1.0K
Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
1.0K
Chirality at Nitrogen, Phosphorus, and Sulfur
6.0K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
6.0K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.2K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.2K
Other Nuclides: 31P, 19F, 15N NMR
470
Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
470
Optimizing Chromatographic Separations
497
Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...
497

