Influence of the hydrothermal synthetic parameters on the pervaporative separation performances of CHA-type zeolite membranes

The polycrystalline CHA-type zeolite layer with Si/Al = 18 was formed on the porous α-Al2O3 tube in this study, and the gas permeation properties were determined using single-component H2, CO2, N2, CH4, n-C4H10, and SF6 at 303–473 K. The membrane showed permeation behavior, wherein the permeance reduced with the molecular size, attributed to the effect of molecular sieving. The separation performances were also determined using the equimolar mixtures of N2–SF6, CO2–N2, and CO2–CH4. As a result, the N2/SF6 and CO2/CH4 selectivities were as high as 710 and 240, respectively. However, the CO2/N2 selectivity was only 25. These results propose that the high-silica CHA-type zeolite membrane is suitable for the separation of CO2 from CH4 by the effect of molecular sieving.

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The removal of nitrogen monoxide from polluted air using CHA- and DDR-type zeolite membranes: insights from molecular simulations

Materials Today Communications ◽

10.1016/j.mtcomm.2021.102651 ◽

2021 ◽

pp. 102651

Author(s):

Amir Hasanzadeh ◽

Siamak Pakdel ◽

Jafar Azamat ◽

Hamid Erfan-Niya ◽

Alireza Khataee

Keyword(s):

Molecular Simulations ◽

Nitrogen Monoxide ◽

Zeolite Membranes ◽

Type Zeolite

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EFFECT OF SODA CONCENTRATION ON THE MORPHOLOGY OF MFI-TYPE ZEOLITE MEMBRANES

Chemical Engineering Communications ◽

10.1080/00986440802290144 ◽

2008 ◽

Vol 196 (1-2) ◽

pp. 182-193 ◽

Cited By ~ 3

Author(s):

Belma Soydaş ◽

Ali Çulfaz ◽

Halil Kalipçilar

Keyword(s):

Zeolite Membranes ◽

Type Zeolite

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Effect of seeding on the properties of MFI type zeolite membranes

Desalination ◽

10.1016/j.desal.2006.03.244 ◽

2006 ◽

Vol 200 (1-3) ◽

pp. 66-67 ◽

Cited By ~ 3

Author(s):

Eser Dinçer ◽

Ali Çulfaz ◽

Halil Kalipçilar

Keyword(s):

Zeolite Membranes ◽

Type Zeolite

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Hydrophobic *BEA-Type Zeolite Membranes on Tubular Silica Supports for Alcohol/Water Separation by Pervaporation

Membranes ◽

10.3390/membranes9070086 ◽

2019 ◽

Vol 9 (7) ◽

pp. 86 ◽

Cited By ~ 2

Author(s):

Kyohei Ueno ◽

Saki Yamada ◽

Toshinari Watanabe ◽

Hideyuki Negishi ◽

Takuya Okuno ◽

...

Keyword(s):

Alternative Energy ◽

Separation Performance ◽

Water Mixture ◽

Water Separation ◽

Zeolite Membranes ◽

Pure Silica ◽

Large Pore ◽

Silica Supports ◽

Alcohol Water ◽

Type Zeolite

Hydrophobic pure-silica *BEA-type zeolite membranes with large pores were prepared on tubular silica supports by hydrothermal synthesis using a secondary growth method and were applied to the separation of alcohol/water mixtures by pervaporation (PV), an alternative energy-efficient process for production of biofuels. Amorphous pure-silica tubular silica supports, free of Al atoms, were used for preparing the membranes. In this study, the effects of the synthesis conditions, such as the H2O/SiO2 and NH4F/SiO2 ratios in the synthetic gel, on the membrane formation process and separation performance were systematically investigated. The successfully prepared dense and continuous membranes exhibited alcohol selectivity and high flux for the separation of ethanol/water and butanol/water mixtures. The pure-silica *BEA membranes obtained under optimal conditions (0.08SiO2:0.5TEAOH:0.7NH4F:8H2O) showed high PV performance with a separation factor of 229 and a flux of 0.62 kg·m−2·h−1 for a 1 wt % n-butanol/water mixture at 318 K. This result was attributed to the hydrophobicity and large pore size of the pure-silica *BEA membrane. This was the first successful synthesis of hydrophobic large-pore zeolite membranes on tubular supports with alcohol selectivity, and the obtained results could provide new insights into the research on hydrophobic membranes with high permeability.

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