Preparation and Characterization of AgA Zeolite/Polysulfone Membranes

2012 ◽  
Vol 549 ◽  
pp. 401-405
Author(s):  
Tian Ming Zhang ◽  
Zhen Huang ◽  
Xiao Hong Zhang ◽  
Li Ying Guo
Keyword(s):  
Ion Exchange ◽  
Gas Permeability ◽  
Composite Membranes ◽  
Gas Permeation ◽  
Silver Ion ◽  
Interfacial Interactions ◽  
Polysulfone Membrane ◽  
Characterization Methods ◽  
Permeation Test

In present study, a few polysulfone composite membranes with the introduction of silver ion-exchange treated zeolite were prepared and evaluated by several characterization methods. Regularly-ordered zeolite particles were generally finely dispersed in the continuous PSF phase with appreciated organic-inorganic interfacial interactions as reflected by SEM and FTIR results. Gas permeation test shows that after incorporating zeolite the polysulfone membrane exhibits significantly decreased gas permeability for H2, N2, and CO2 whereas they show increased permselectivity for CO2/N2, H2/CO2 and H2/N2 gas pairs as compared to neat polysulfone membrane.

PEMFC Development at Asahi Glass Co., Ltd.

1999 ◽  
Vol 575 ◽  
Author(s):  
M. Yoshitake ◽  
E. Yanagisawa ◽  
T. Naganuma ◽  
Y. Kunisa
Keyword(s):  
Ion Exchange ◽  
Mechanical Strength ◽  
Water Content ◽  
Hydrogen Permeation ◽  
Specific Resistance ◽  
Gas Permeability ◽  
Cell Voltage ◽  
Free Cell ◽  
Gas Permeation ◽  
Membrane Thickness

ABSTRACTPerfluorinated ion exchange membranes were studied and the membrane technology for PEMFC has been developed. Thermal stability, mechanical strength, water content, AC specific resistance and gas permeability were measured. The influence of membrane thickness on gas permeability and the influence of incorporation of cations on water content and AC specific resistance of Flemion® and Nafion® 117 were estimated. Gas permeation rates of the membranes decreased in inverse proportion to the increase of the membrane thickness and gas permeability coefficients were nearly constant and independent of the thickness. Hydrogen permeation rates of Flemion®S at 70°C were converted to 2.1 mA/cm2 as cunent density. Flemion®R-electrode assembly showed to maintain stable perfonnance for over 3,500hr. Furthermore, it was found that usage of thinner membranes or one with higher ion-exchange capacity gave not only lower intemal cell voltage but also higher iR-free cell voltage. PTFE-yam embedded type membrane (Flemion®Mc and Sc) and PTFE-flbril dispersed type (Flemion®R12) was examined to afford improvement in mechanical strength at moist and high temperature atmosphere. Flemion®Sc (80!am) was examined to give high cell performance of 0.67V at 0.5A/cm2, 80°C, I ata. Flemior®Mc-electrode assembly was examined to keep stable performance during the life test of over 1,500hr.

Ion Beam Irradiation—An Efficient Method to Modify The Subnanometer Scale Microstructure of Polymers In A Controlled Way

1998 ◽  
Vol 540 ◽  
Author(s):  
Xinglong Xu ◽  
M. R. Coleman ◽  
U. Myler ◽  
P. J. Simpson
Keyword(s):  
Ion Irradiation ◽  
Gas Permeability ◽  
Ion Beam ◽  
Composite Membranes ◽  
Positron Annihilation Spectroscopy ◽  
Gas Permeation ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Application Potential ◽  
Promising Application

AbstractThe microstructural evolution of polymers induced by ion beam irradiation was investigated using gas permeation measurements with different molecule size gases and positron annihilation spectroscopy (PAS) using variable-energy positron. Simultaneous large increases in gas permeability and permselectivity of polymer-ceramic composite membranes modified by 180 keV H+ ion irradiation indicated that ion irradiation of polymers can modify the microstructure of polymer at sub-nanometer level in a controlled way. PAS results were consistent with the gas permeation results. The results of this work demonstrated ion beam irradiation has a promising application potential in the separation industry.

scholarly journals Synthesis and Gas-Permeation Characterization of a Novel High-Surface Area Polyamide Derived from 1,3,6,8-Tetramethyl-2,7-diaminotriptycene: Towards Polyamides of Intrinsic Microporosity (PIM-PAs)

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 361 ◽  
Author(s):  
Giuseppe Genduso ◽  
Bader Ghanem ◽  
Yingge Wang ◽  
Ingo Pinnau
Keyword(s):  
Surface Area ◽  
Gas Permeability ◽  
High Surface ◽  
High Surface Area ◽  
Gas Permeation ◽  
Bet Surface Area ◽  
Mixed Gas ◽  
Fractional Free Volume ◽  
Intrinsic Microporosity

A triptycene-based diamine, 1,3,6,8-tetramethyl-2,7-diamino-triptycene (TMDAT), was used for the synthesis of a novel solution-processable polyamide obtained via polycondensation reaction with 4,4′-(hexafluoroisopropylidene)bis(benzoic acid) (6FBBA). Molecular simulations confirmed that the tetrasubstitution with ortho-methyl groups in the triptycene building block reduced rotations around the C–N bond of the amide group leading to enhanced fractional free volume. Based on N2 sorption at 77 K, 6FBBA-TMDAT revealed microporosity with a Brunauer–Emmett–Teller (BET) surface area of 396 m2 g−1; to date, this is the highest value reported for a linear polyamide. The aged 6FBBA-TMDAT sample showed moderate pure-gas permeabilities (e.g., 198 barrer for H2, ~109 for CO2, and ~25 for O2) and permselectivities (e.g., αH2/CH4 of ~50) that position this polyamide close to the 2008 H2/CH4 and H2/N2 upper bounds. CO2–CH4 mixed-gas permeability experiments at 35 °C demonstrated poor plasticization resistance; mixed-gas permselectivity negatively deviated from the pure-gas values likely, due to the enhancement of CH4 diffusion induced by mixing effects.

scholarly journals Multicomponent Network Formation in Selective Layer of Composite Membrane for CO2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 174
Author(s):  
Jelena Lillepärg ◽  
Evgeni Sperling ◽  
Marit Blanke ◽  
Martin Held ◽  
Sergey Shishatskiy
Keyword(s):  
Network Formation ◽  
Composite Membranes ◽  
Low Molecular Weight ◽  
Scanning Calorimetry ◽  
Selective Layer ◽  
Characterization Methods ◽  
Force Microscopy ◽  
Thin Film Composite ◽  
Atomic Force

As a promising material for CO2/N2 separation, PolyActiveTM can be used as a separation layer in thin-film composite membranes (TFCM). Prior studies focused on the modification of PolyActiveTM using low-molecular-weight additives. In this study, the effect of chemical crosslinking of reactive end-groups containing additives, forming networks within selective layers of the TFCM, has been studied. In order to understand the influence of a network embedded into a polymer matrix on the properties of the resulting materials, various characterization methods, including Fourier transform infrared spectroscopy (FTIR), gas transport measurements, differential scanning calorimetry (DSC) and atomic force microscopy (AFM), were used. The characterization of the resulting membrane regarding individual gas permeances by an in-house built “pressure increase” facility revealed a twofold increase in CO2 permeance, with insignificant losses in CO2/N2 selectivity.

scholarly journals Preparation and Characterization of Mixed Matrix Membrane based on Polysulfone (PSF) and Lanthanum Orthoferrite (LaFeO3) for Gas Separation

2020 ◽  
Vol 24 (1) ◽  
Author(s):  
N. S. Fadaly ◽  
Farhana Aziz
Keyword(s):  
Gas Permeation ◽  
Mixed Matrix Membrane ◽  
Gravimetric Analysis ◽  
High Permeability ◽  
Mixed Matrix ◽  
Feed Pressure ◽  
Ft Ir ◽  
Set Up ◽  
Permeation Test

The aim of this study is to investigate the effects of polysulfone (PSF) and lanthanum orthoferrite (LaFeO3) incorporated mixed matrix membrane (MMM) on gas permeation and selectivity properties. PSF/LaFeO3 MMMs were prepared with various weights loading of LaFeO3. The membranes obtained were characterized using scanning electron microscope (SEM), thermal gravimetric analysis (TGA) and Fourier-transform infra-red (FT-IR). The gas transport properties of MMM were measured using single gas permeation set up (CO2, CH4, O2 and N2) at ambient temperature, and feed pressure of 2, 4 and 6 bar. The permeation test showed that the mixed matrix membrane exhibited high permeability. With increasing LaFeO3 weight loading to 1.0%, the highest permeability values were 47.74 GPU for CO2, 29.85 GPU for CH4, 57.56 GPU for O2, and 40.66 GPU for N2. The results also showed that by incorporating 1.0wt% of LaFeO3 into PSF matrix, the highest CO2/CH4 and O2/N2 selectivity of 1.60 and 1.42 respectively were obtained. Overall, all the resultants MMM showed higher permeability and selectivity compared to pure PSF membrane.

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