Preparation of NaA zeolite membranes for separation of water/UDMH mixtures

Kazemimoghadam, Mansoor; Mohammadi, Toraj

doi:10.1016/j.seppur.2005.06.013

Cited by 19 publications

(10 citation statements)

References 21 publications

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“…The permeation flux of a single gas through a zeolite membrane is usually described by surface diffusion, thus for a perfect (defect free) zeolite membrane, the gas permeance decreases with increasing number of layers. 21 As observed, permeances of O 2 and SF 6 decrease with increasing number of layers in the synthesized membranes. Therefore, it can be said that as number of layers increases, the surface diffusion contribution through the molecular sieve pores decreases, and as a result, the gas permeances decrease.…”

Section: Effect Of Synthesis Temperaturesupporting

confidence: 57%

Section: Resultsmentioning

confidence: 57%

“…1 Different types of zeolite membranes have different crystal structure, pore size, and surface properties, thus exhibiting different separation and/or catalytic properties. Membranes of zeolite types Y, 2-5 X, [6][7][8] MOR, 9,10 MFI, [11][12][13][14][15][16] A, [17][18][19][20][21][22][23][24] T, [25][26][27][28][29][30] and W 31,32 have been prepared and used for gas separation and pervaporation.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Ceramic Membranes (W‐Type Zeolite Membranes)

Mohammadi

Maghsoodloorad

2012

Int J Applied Ceramic Tech

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In this article, effects of synthesis parameters (synthesis temperature, synthesis time, and number of layers) on W‐type zeolite membranes synthesized over flat SUS supports for O2/SF6 gas separation were experimentally investigated. Experiments were carried out at these levels of synthesis temperature: 165°C, 185°C, and 200°C; synthesis time: 6, 12, and 18 h and number of layers: 1 and 2. Permeation measurements, XRD and SEM analysis were used for characterization of the synthesized membranes. The results showed that increasing synthesis temperature from 165°C up to 185°C increases separation factor of O2/SF6, however, further increasing decreases the separation performance. The same trend was observed for synthesis time for the single layer synthesized zeolite W membrane, although for the double layer synthesized zeolite W membrane, separation factor increased with increasing synthesis time. Repetition of layering has a net positive effect on separation factor of O2/SF6, and negative effect on permeation flux through the membranes. This behavior was attributed to the dual effect of synthesis temperature and synthesis time on selectivity. More zeolite crystals are deposited and larger crystals are formed at higher synthesis temperatures and longer synthesis times. Well W‐type zeolite membrane was synthesized at 185°C for 18 h with two repeating layers with a high separation factor of 20.1.

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Section: Effect Of Synthesis Temperaturesupporting

confidence: 57%

Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Ceramic Membranes (W‐Type Zeolite Membranes)

Mohammadi

Maghsoodloorad

2012

Int J Applied Ceramic Tech

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“…To minimize this problem researchers have worked on finding new ways to manufacture membranes in which fouling problem is minimized yet keeping high salt rejection. Some example of these techniques are those related to the incorporation of nanoparticles during membrane formulation [ 19 , 20 , 21 , 22 , 23 ], the graft polymerization of ionic liquids with nanoparticles [ 24 ], the addition of co-solvent during the manufacturing process [ 25 ], the fabrication electrically conductive membranes based on carbon nanostructures [ 26 ], the preparation of permeable zeolite membranes [ 27 , 28 , 29 ], the interfacial polymerization with natural material [ 29 , 30 ] and the use of hydrophilic modifier [ 6 , 7 , 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

New RO TFC Membranes by Interfacial Polymerization in n-Dodecane with Various co-Solvents

et al. 2016

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The objective of this research is to prepare and characterize a new and highly efficient polyamide TFC RO membrane by interfacial polymerization in dodecane solvent mixed with co-solvents. Three co-solvents were tested namely; acetone, ethyl acetate, and diethyl ether of concentration of 0.5, 1, 2, 3, and 5 wt %. The modified membranes were characterized by SEM, EDX, AFM and contact angle techniques. The results showed that addition of co-solvent results in a decrease in the roughness, pore size and thickness of the produced membranes. However, as the concentration of the co-solvent increases the pore size of the membranes gets larger. Among the three co-solvents tested, acetone was found to result in membranes with the largest pore size and contact angle followed by diethyl ether then ethyl acetate. Measured contact angle increases as the concentration of the co-solvent increases reaching a constant value except for ethyl acetate where it was found to drop. Investigating flux and salt rejection by the formulated membranes showed that higher flux was attained when acetone was used as a co-solvent followed by diethyl ether then ethyl acetate. However, the highest salt rejection was achieved with diethyl ether.

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“…Various zeolite membranes such as Y [3][4][5], X [6,7], CHA [8][9][10][11], MFI [12][13][14], A [15][16][17][18][19], MOR [20,21], BZSM-5 [22], and T [23][24][25][26] have been applied for gas separation. The choice of a zeolite type for gas separation depends on its pore size and adsorption characterisctis towards particular molecules [27].…”

Section: Introductionmentioning

confidence: 99%

Potential Separation of SF₆ from Air Using Chabazite Zeolite Membranes

et al. 2014

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Chabazite zeolite membranes were synthesized by the secondary growth method. Chabazite powders were obtained by decomposition of zeolite Y and subsequent ion exchange to produce a fully exchanged potassium chabazite. The synthesized powders were used as seeds for membrane synthesis. Chabazite membranes were prepared via hydrothermal synthesis on porous a-alumina disks as supports. The effects of synthesis parameters including synthesis temperature and synthesis time on the chabazite zeolite membranes were investigated. The synthesized powders and membranes were characterized and the separation performance of the synthesized membranes were evaluated by separation of N 2 /SF 6 and O 2 /SF 6 gas mixtures. Gas permeation results are discussed in terms of optimum synthesis temperature and time.

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Preparation of NaA zeolite membranes for separation of water/UDMH mixtures

Cited by 19 publications

References 21 publications

Synthesis and Characterization of Ceramic Membranes (W‐Type Zeolite Membranes)

Synthesis and Characterization of Ceramic Membranes (W‐Type Zeolite Membranes)

New RO TFC Membranes by Interfacial Polymerization in n-Dodecane with Various co-Solvents

Potential Separation of SF₆ from Air Using Chabazite Zeolite Membranes

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Preparation of NaA zeolite membranes for separation of water/UDMH mixtures

Cited by 19 publications

References 21 publications

Synthesis and Characterization of Ceramic Membranes (W‐Type Zeolite Membranes)

Synthesis and Characterization of Ceramic Membranes (W‐Type Zeolite Membranes)

New RO TFC Membranes by Interfacial Polymerization in n-Dodecane with Various co-Solvents

Potential Separation of SF6 from Air Using Chabazite Zeolite Membranes

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Product

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Potential Separation of SF₆ from Air Using Chabazite Zeolite Membranes