scholarly journals An Analysis of the Effect of ZIF-8 Addition on the Separation Properties of Polysulfone at Various Temperatures

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 427
Author(s):  
Kseniya Papchenko ◽  
Giulio Risaliti ◽  
Matteo Ferroni ◽  
Meganne Christian ◽  
Maria Grazia De Angelis
Keyword(s):  
Structural Properties ◽  
Relative Permeability ◽  
Composite Films ◽  
Density Measurement ◽  
Co2 Separation ◽  
Separation Performance ◽  
Zeolitic Imidazolate Framework ◽  
Pure Polymer ◽  
Volume Fractions ◽  
The Ideal

The transport of H2, He, CO2, O2, CH4, and N2 at three temperatures up to 65 °C was measured in dense, thick composite films formed by amorphous Polysulfone (PSf) and particles of the size-selective zeolitic imidazolate framework 8 (ZIF-8) at loadings up to 16 wt%. The morphological and structural properties of the membranes were analyzed via SEM and density measurement. The addition of ZIF-8 to PSf enhances the H2 and He permeabilities up to 480% with respect to the pure polymer, while the ideal H2/CO2 and He/CO2 selectivities of MMMs reach values up to 30–40% higher than those of pure PSf. The relative permeability and diffusivity enhancements are higher than those obtained in other polymers, such as PPO, with the same amount of filler. The Maxwell–Wagner–Sillars model is able to represent the MMM H2/CO2 separation performance for filler volume fractions below 10%.

scholarly journals Enhancing the Separation Performance of Glassy PPO with the Addition of a Molecular Sieve (ZIF-8): Gas Transport at Various Temperatures

Membranes ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 56 ◽  
Author(s):  
Francesco M. Benedetti ◽  
Maria Grazia De Angelis ◽  
Micaela Degli Esposti ◽  
Paola Fabbri ◽  
Alice Masili ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Scale Up ◽  
Composite Films ◽  
Filler Loading ◽  
Separation Performance ◽  
Zeolitic Imidazolate Framework ◽  
Lower Extent ◽  
Two Phases ◽  
Activation Energy Of Diffusion ◽  
The Ideal

In this study, we prepared and characterized composite films formed by amorphous poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) and particles of the size-selective Zeolitic Imidazolate Framework 8 (ZIF-8). The aim was to increase the permselectivity properties of pure PPO using readily available materials to enable the possibility to scale-up the technology developed in this work. The preparation protocol established allowed robust membranes with filler loadings as high as 45 wt% to be obtained. The thermal, morphological, and structural properties of the membranes were analyzed via DSC, SEM, TGA, and densitometry. The gas permeability and diffusivity of He, CO2, CH4, and N2 were measured at 35, 50, and 65 °C. The inclusion of ZIF-8 led to a remarkable increase of the gas permeability for all gases, and to a significant decrease of the activation energy of diffusion and permeation. The permeability increased up to +800% at 45 wt% of filler, reaching values of 621 Barrer for He and 449 for CO2 at 35 °C. The ideal size selectivity of the PPO membrane also increased, albeit to a lower extent, and the maximum was reached at a filler loading of 35 wt% (1.5 for He/CO2, 18 for CO2/N2, 17 for CO2/CH4, 27 for He/N2, and 24 for He/CH4). The density of the composite materials followed an additive behavior based on the pure values of PPO and ZIF-8, which indicates good adhesion between the two phases. The permeability and He/CO2 selectivity increased with temperature, which indicates that applications at higher temperatures than those inspected should be encouraged.

CO2 Separation Performance of Zeolitic Imidazolate Framework-8 Porous Slurry in a Pilot-Scale Packed Tower

2020 ◽  
Vol 59 (13) ◽  
pp. 6154-6163 ◽  
Author(s):  
Hai Li ◽  
Bei Liu ◽  
Mingke Yang ◽  
Ding Zhu ◽  
Zixuan Huang ◽  
...  
Keyword(s):  
Pilot Scale ◽  
Co2 Separation ◽  
Separation Performance ◽  
Zeolitic Imidazolate Framework ◽  
Packed Tower

A Robust Zeolitic Imidazolate Framework Membrane with High H2/CO2 Separation Performance under Hydrothermal Conditions

2019 ◽  
Vol 11 (17) ◽  
pp. 15748-15755 ◽  
Author(s):  
Zhan Li ◽  
PingPing Yang ◽  
Shichen Yan ◽  
Qianrong Fang ◽  
Ming Xue ◽  
...  
Keyword(s):  
Co2 Separation ◽  
Separation Performance ◽  
Hydrothermal Conditions ◽  
Zeolitic Imidazolate Framework

scholarly journals On the molecular mechanisms for the H2/CO2 separation performance of zeolite imidazolate framework two-layered membranes

2017 ◽  
Vol 8 (1) ◽  
pp. 325-333 ◽  
Author(s):  
Fernando Cacho-Bailo ◽  
Ismael Matito-Martos ◽  
Julio Perez-Carbajo ◽  
Miren Etxeberría-Benavides ◽  
Oğuz Karvan ◽  
...  
Keyword(s):  
Gas Separation ◽  
Molecular Mechanisms ◽  
Co2 Separation ◽  
Separation Performance ◽  
Zeolitic Imidazolate Framework ◽  
Combustion Gas

A zeolitic imidazolate framework two-layered membrane approach is simulated and experimentally validated to improve the pre-combustion gas separation.

scholarly journals Synthesis and Characterization of Hybrid Metal Zeolitic Imidazolate Framework Membrane for Efficient H2/CO2 Gas Separation

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5009
Author(s):  
Po-Hsueh Chang ◽  
Yuan-Tse Lee ◽  
Cheng-Hsiung Peng
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Gas Separation ◽  
Separation Factor ◽  
Gas Permeation ◽  
Co2 Separation ◽  
Separation Performance ◽  
Zeolitic Imidazolate Framework ◽  
Cobalt Ions ◽  
Mixed Metal

In this paper, we propose mixed metal ions in the node of the zeolitic imidazolate framework (ZIF) structure. The hybrid metal ZIF is formed for the gas separation of hydrogen and carbon dioxide. In the first stage, the nanoparticles were prepared as a coating on a substrate, and acting as secondary growing nuclei. The hybrid metal ZIF structures were characterized by X-ray diffractometry (XRD) and Fourier transform infrared spectroscopy (FTIR). N2 adsorption–desorption isotherms determined surface area, and scanning electron microscopy (SEM) was used to observe the microstructure and surface morphology. The hybrid metal ZIF-8-67 powder had the largest surface area (1260.40 m2 g−1), and the nanoparticles (100 nm) could be fully dense-coated on the substrate to benefit the subsequent membrane growth. In the second stage, we prepared the hybrid metal ZIF-8-67 membrane on the pre-seeding substrate with mixed metal nanoparticles of cobalt and zinc, by the microwave hydrothermal method. Cobalt ions were identified in the tetrahedral coordination through UV–Vis, and the membrane structure and morphology were determined by XRD and SEM. Finally, a gas permeation analyzer (GPA) was used to determine the gas separation performance of the hybrid metal ZIF-8-67 membrane. We successfully introduced zinc ions and cobalt ions into the ZIF structure, where cobalt had a strong interaction with CO2. Therefore, GPA analysis showed an excellent H2/CO2 separation factor due to lower CO2 permeability. The CO2 permeance was ~0.65 × 10−8 mol m−2 s−1 Pa−1, and the separation factors for H2/CO2 and H2/N2 were 9.2 and 2.9, respectively. Our results demonstrate that the hybrid metal ZIF-8-67 membrane has a superior H2/CO2 separation factor, which can be attributed to its very high specific surface area and structure. Based on the above, hybrid metal ZIF-8-67 membranes are expected to be applied in hydrogen or carbon dioxide gas separation and purification.

Porous ceramic hollow fiber-supported Pebax/PEGDME composite membrane for CO2 separation from biohythane

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 60453-60459 ◽  
Author(s):  
Jun Cheng ◽  
Leiqing Hu ◽  
Chaofan Ji ◽  
Junhu Zhou ◽  
Kefa Cen
Keyword(s):  
Composite Membrane ◽  
Hollow Fiber ◽  
Porous Ceramic ◽  
Co2 Separation ◽  
Excellent Performance ◽  
The Ideal

Ceramic hollow fiber-supported Pebax/PEGDME membrane was prepared to separate CO2. The composite membrane showed excellent performance of removing CO2 from biohythane. The ideal CO2/H2 selectivity increased to 26 when temperature decreased to 10 °C.

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