scholarly journals Enhanced Performance of Carbon Molecular Sieve Membranes Incorporating Zeolite Nanocrystals for Air Separation

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 489
Author(s):  
Chong Yang Chuah ◽  
Kunli Goh ◽  
Tae-Hyun Bae
Keyword(s):  
Polymer Matrix ◽  
Upper Bound ◽  
Molecular Sieve ◽  
Gas Permeation ◽  
Separation Process ◽  
Air Separation ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Polymer Precursors

Three different zeolite nanocrystals (SAPO-34, PS-MFI and ETS-10) were incorporated into the polymer matrix (Matrimid® 5218) as polymer precursors, with the aim of fabricating mixed-matrix carbon molecular sieve membranes (CMSMs). These membranes are investigated for their potential for air separation process. Based on our gas permeation results, incorporating porous materials is feasible to improve O2 permeability, owing to the creation of additional porosities in the resulting mixed-matrix CMSMs. Owing to this, the performance of the CMSM with 30 wt% PS-MFI loading is able to surpass the upper bound limit. This study demonstrates the feasibility of zeolite nanocrystals in improving O2/N2 separation performance in CMSMs.

scholarly journals Carbon Molecular Sieve Membranes Comprising Graphene Oxides and Porous Carbon for CO2/N2 Separation

Membranes ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 284
Author(s):  
Chong Yang Chuah ◽  
Junghyun Lee ◽  
Juha Song ◽  
Tae-Hyun Bae
Keyword(s):  
Molecular Sieve ◽  
Accessible Surface Area ◽  
Gas Permeation ◽  
Filler Materials ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Graphene Oxides ◽  
Accessible Surface ◽  
Carbon Based

To improve the CO2/N2 separation performance, mixed-matrix carbon molecular sieve membranes (mixed-matrix CMSMs) were fabricated and tested. Two carbon-based fillers, graphene oxide (GO) and activated carbon (YP-50F), were separately incorporated into two polymer precursors (Matrimid® 5218 and ODPA-TMPDA), and the resulting CMSMs demonstrated improved CO2 permeability. The improvement afforded by YP-50F was more substantial due to its higher accessible surface area. Based on the gas permeation data and the Robeson plot for CO2/N2 separation, the performances of the CMSMs containing 15 wt % YP-50F and 15 wt % GO in the mixed polymer matrix surpassed the 2008 Robeson upper bound of polymeric membranes. Hence, this study demonstrates the feasibility of such membranes in improving the CO2/N2 separation performance through the appropriate choice of carbon-based filler materials in polymer matrices.

scholarly journals Tailoring the Stabilization and Pyrolysis Processes of Carbon Molecular Sieve Membrane Derived from Polyacrylonitrile for Ethylene/Ethane Separation

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 93
Author(s):  
DaeHun Kim ◽  
YongSung Kwon ◽  
Jung-Hyun Lee ◽  
Seong-Joong Kim ◽  
You-In Park
Keyword(s):  
Molecular Sieve ◽  
Pyrolysis Temperature ◽  
Separation Performance ◽  
Carbon Molecular Sieve ◽  
Alumina Support ◽  
Soaking Time ◽  
Polymer Precursors ◽  
Pre Treatment ◽  
Excellent Thermal Property ◽  
Pyrolysis Processes

For ethylene/ethane separation, a CMS (carbon molecular sieve) membrane was developed with a PAN (polyacrylonitrile) polymer precursor on an alumina support. To provide an excellent thermal property to PAN precursor prior to the pyrolysis, the stabilization as a pre-treatment process was carried out. Tuning the stabilization condition was very important to successfully preparing the CMS membrane derived from the PAN precursor. The stabilization and pyrolysis processes for the PAN precursor were finely tuned, and optimized in terms of stabilization temperature and time, as well as pyrolysis temperature, heating rate, and soaking time. The PAN stabilized at >250 °C showed improved thermal stability and carbon yield. The CMS membrane derived from stabilized PAN showed reasonable separation performance for ethylene permeance (0.71 GPU) and ethylene/ethane selectivity (7.62), respectively. Increasing the pyrolysis temperature and soaking time gave rise to an increase in the gas permeance, and a reduction in the membrane selectivity. This trend was opposite to that for the CMS membranes derived from other polymer precursors. The optimized separation performance (ethylene permeance of 2.97 GPU and ethylene/ethane selectivity of 7.25) could be achieved at the pyrolysis temperature of 650 °C with a soaking time of 1 h. The separation performance of the CMS membrane derived from the PAN precursor was comparable to that of other polymer precursors, and surpassed them regarding the upper bound trade off.

Surface modification effect of carbon molecular sieve (CMS) on the morphology and separation performance of mixed matrix membranes

2019 ◽  
Vol 80 ◽  
pp. 106152 ◽  
Author(s):  
Amelia S. Wiryoatmojo ◽  
Hafiz Abdul Mannan ◽  
Rizwan Nasir ◽  
Hilmi Mukhtar ◽  
Dzeti Farhah Mohshim ◽  
...  
Keyword(s):  
Surface Modification ◽  
Molecular Sieve ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Modification Effect ◽  
Matrix Membranes

A Mini Review on Carbon Molecular Sieve Membrane for Oxygen Separation

2020 ◽  
Vol 4 (1) ◽  
pp. 23-35
Author(s):  
Fatin Nurwahdah Ahmad ◽  
Norazlianie Sazali ◽  
Mohd Hafiz Dzafran Othman
Keyword(s):  
Molecular Sieve ◽  
High Performance ◽  
Separation Performance ◽  
Carbon Membrane ◽  
Carbon Molecular Sieve ◽  
Carbon Membranes ◽  
Advantages And Disadvantages ◽  
Polymer Precursors ◽  
And Performance

Membrane-based technology has proved its practicality in gas separation through its performance. Various type of membranes has been explored, showing that each type of them have their own advantages and disadvantages. Polymeric membranes have been widely used to separate O2/N2, however, its drawbacks lead to the development of carbon molecular sieve membrane. Carbon molecular sieve membranes have demonstrated excellent separation performance for almost similar kinetic diameter molecules such as O2/N2. Many polymer precursors can be used to produce carbon molecular sieve membrane through carbonization process or also known as heat treatment. This paper discusses the variety of precursors and carbonization parameters to produce high quality and performance of carbon molecular sieve membranes.  This paper covers the evaluation in advancement and status of high-performance carbon membrane implemented for separating gas, comprising the variety of precursor materials and the fabrication process that involve many different parameters, also analysis of carbon membranes properties in separating various type of gas having high demand in the industries. The issues regarding the current challenges in developing carbon membrane and approaches with the purpose of solving and improving the performance and applications of carbon membrane are included in this paper. Also, the advantages of the carbon membrane compared to other types of membranes are highlighted. Observation and understanding the variables affecting the quality of membrane encourage the optimization of conditions and techniques in producing high-performance membrane.

Effect of Carbon Molecular Sieve (CMS) Concentration on Mixed Matrix Membranes (MMMs) Performance for Carbon Dioxide Removal

2015 ◽  
Vol 754-755 ◽  
pp. 869-873 ◽  
Author(s):  
Rizwan Nasir ◽  
Hilmi Mukhtar ◽  
Maizatul Shima Shaharun ◽  
Zakaria Man
Keyword(s):  
Molecular Sieve ◽  
Gas Permeation ◽  
Polymer Chains ◽  
Mixed Matrix Membranes ◽  
Size Discrimination ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Solution Casting Method ◽  
Pes Membrane ◽  
Matrix Membranes

Different compositions of carbon molecular sieve (CMS) were incorporated in polyethersulfone (PES) matrix to fabricate mixed matrix membranes (MMMs) by solution casting method. The characterization was carried out using field emission scanning electron microscopy (FESEM) analysis to investigate the morphology of membrane. FESEM images showed acceptable contacts between the filler particles and the polymer chains. The performance of the developed membrane is analyzed by single gas permeation measurement of high purity CO2 and CH4. Both CO2 permeance and CO2/CH4 selectivity increased with CMS loadings as compared to pure PES membrane. Experimental results showed that the highest value of CO2 permeance (66.71 GPU) and CO2/CH4 selectivity (10.94) can be achieved with 30 wt. % loading of CMS particles. This can be credited to size discrimination of CMS pores that falls between CO2 and CH4 kinetic diameters.

scholarly journals Structure and Gas Transport Behavior of Polysulfone/ Polyacrylonitrile–carbon Molecular Sieve Mixed Matrix Membrane

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
W. A.W. Rafidah ◽  
A. F. Ismail ◽  
T. Matsuura ◽  
S. A. Hashemifard ◽  
A. Suhaimi
Keyword(s):  
Gas Separation ◽  
Molecular Sieve ◽  
Gas Transport ◽  
Gas Permeation ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Carbon Molecular Sieve ◽  
Scanning Calorimetry ◽  
Transport Behavior ◽  
Interfacial Gap

Mixed matrix membrane (MMM) comprising of polyacrylonitrile based carbon molecular sieve (PAN–CMS) and polysulfone (PSF) Udel® P–1700 were synthesized and characterized as an alternative material for gas separation. The structure and the gas transport behavior of this hybrid system was investigated by thorough analysis using thermal gravimetry analysis (TGA), differential scanning calorimetry (DSC), field emission scanning microscopy (FESEM) and single gas permeation test. The thermal analysis based on TGA and DSC results indicated that Tgs and Tds of PSF have been extended to higher temperatures. These findings suggest that PAN–CMS have improved the thermal property of PSF in the MMM system. FESEM micrographs revealed that the PSF/ PANCMS MMMs possess an acceptable PSF and PAN–CMS interfacial adhesion with the average interfacial gap size of less than 1ìm. The excellent gas separation capability of the PSF/ PAN–CMS MMM was proven as the hybrid film with 20 wt% PAN–CMS loading exhibited higher O2/N2 selectivity (5.80) than that of pure PSF film (5.45).

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