Optimal synthesis of nanosize seeds for secondary growth of high performance hydroxy-sodalite (H-SOD) zeolite membranes for small gas and water separations

2021 ◽  
pp. 111451
Author(s):  
Devipriyanka Arepalli ◽  
Aafaq-ur Rehman ◽  
Min-Zy Kim ◽  
Syed Fakhar Alam ◽  
Churl-Hee Cho
Keyword(s):  
High Performance ◽  
Secondary Growth ◽  
Optimal Synthesis ◽  
Zeolite Membranes

Microwave-Assisted Synthesis and Permeation Performance of NaA Zeolite Membrane by Secondary Growth Method

2014 ◽  
Vol 1053 ◽  
pp. 389-393
Author(s):  
Zhi Lin Cheng ◽  
Ying Ying Liu
Keyword(s):  
Gas Permeability ◽  
Knudsen Diffusion ◽  
Secondary Growth ◽  
Zeolite Membrane ◽  
Microwave Assisted Synthesis ◽  
Vapor Phase Transport ◽  
Zeolite Membranes ◽  
Synthesis Time ◽  
Naa Zeolite ◽  
Naa Zeolite Membrane

The highly intergrown NaA zeolite membranes on seeded α-Al2O3substrate were synthesized by microwave heating method. The preparation of seeds with the size of ca.120nm employed the vapor phase transport method (VPT). The XRD patterns indicated that the pure NaA zeolite membranes formed on the seeded α-Al2O3substrate for varied synthesis times. However, the peak intensity of NaA zeolite membrane with synthesis time of 50min obviously decreased, suggesting that the NaA membrane could take place the dissolution at that time. The SEM images indicated that the NaA zeolite membranes with synthesis time of 15-30min had a good integrity and consisted of highly intergrown zeolite crystals, but the NaA membrane with synthesis time of 50min appeared some large defects, further verifying the result of XRD pattern. The gas permeability showed that the maximum of H2/N2and H2/C3H8permselectivities attained 4.23 and 8.24, respectively, higher than those of the corresponding Knudsen diffusion. These results suggested that the diffusion of gases, at least in part, are affected by the pore size of zeolite and the function of molecular sieving can be embodied on the synthesized membrane.

Synthesis and Characterization of NaA Zeolite Membranes Prepared by the Secondary Growth Method: A Research-Based Comprehensive Experiment

Daxue Huaxue ◽  
2018 ◽  
Vol 33 (9) ◽  
pp. 69-74
Author(s):  
Liangqing LI ◽  
◽  
Qipeng SONG ◽  
Jinjian ZHANG ◽  
Chenchen DAI ◽  
...  
Keyword(s):  
Secondary Growth ◽  
Synthesis And Characterization ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Growth Method

Optimization of synthesis time for high performance of NaA zeolite membranes synthesized via autoclave for water–ethanol separation

Desalination ◽  
2011 ◽  
Vol 280 (1-3) ◽  
pp. 259-265 ◽  
Author(s):  
Dacho Kunnakorn ◽  
Thirasak Rirksomboon ◽  
Pavadee Aungkavattana ◽  
Neeranut Kuanchertchoo ◽  
Duangduen Atong ◽  
...  
Keyword(s):  
High Performance ◽  
Zeolite Membranes ◽  
Synthesis Time ◽  
Naa Zeolite ◽  
Ethanol Separation

Optimal synthesis of high-performance architectures

1992 ◽  
Vol 27 (3) ◽  
pp. 389-397 ◽  
Author(s):  
C.H. Gebotys ◽  
M.I. Elmasry
Keyword(s):  
High Performance ◽  
Optimal Synthesis

scholarly journals Effects of Seed Crystals on the Growth and Catalytic Performance of TS-1 Zeolite Membranes

Membranes ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 41
Author(s):  
Wenjuan Ding ◽  
Sitong Xiang ◽  
Fei Ye ◽  
Tian Gui ◽  
Yuqin Li ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
High Performance ◽  
Catalytic Performance ◽  
Zeolite Membrane ◽  
Medium Size ◽  
Zeolite Membranes ◽  
Seed Crystals ◽  
Ratio Size ◽  
Porous Mullite ◽  
Size And Morphology

Dense and good catalytic performance TS-1 zeolite membranes were rapidly prepared on porous mullite support by secondary hydrothermal synthesis. The properties of seed crystals were very important for the preparation of high-catalytic performance TS-1 zeolite membranes. Influences of seed crystals (Ti/Si ratios, size, morphology, and zeolites concentration of the seed suspension) on the growth and catalytic property of TS-1 zeolite membranes were investigated in details. High Ti/Si ratio, medium-size, and morphology of the seed crystals were critical for preparing the high-performance TS-1 zeolite membrane. Compared with the bi-layer TS-1 zeolite membrane (inner and outer of the mullite tube), the mono-layer TS-1 zeolite membrane had a better catalytic performance for Isopropanol IPA oxidation with H2O2. When the Ti/Si ratio, size, and morphology of the TS-1 zeolites were 0.030, 300 nm, ellipsoid, and the zeolites concentration of the seed suspension was 5%, the IPA conversion, and flux through the TS-1 zeolite membrane were 98.23% and 2.58 kg·m−2·h−1, respectively.

scholarly journals Ultrathin ZSM-5 zeolite nanosheet laminated membrane for high-flux desalination of concentrated brines

2018 ◽  
Vol 4 (11) ◽  
pp. eaau8634 ◽  
Author(s):  
Zishu Cao ◽  
Shixuan Zeng ◽  
Zhi Xu ◽  
Antonios Arvanitis ◽  
Shaowei Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Water Flux ◽  
Dip Coating ◽  
Size Exclusion ◽  
Zeolite Membranes ◽  
Scale Thickness ◽  
Thin Film Sensors ◽  
Aspect Ratios ◽  
Molecular Separation ◽  
Oriented Polycrystalline

The tremendous potential of zeolite membranes for efficient molecular separation via size-exclusion effects is highly desired by the energy and chemical industries, but its practical realization has been hindered by nonselective permeation through intercrystalline spaces and high resistance to intracrystalline diffusion in the conventional zeolite membranes of randomly oriented polycrystalline structures. Here, we report the synthesis of ZSM-5 zeolite nanosheets with very large aspect ratios and nanometer-scale thickness in the preferred straight channel direction. We used these ZSM-5 nanosheets to fabricate ultrathin (<500 nm) laminated membranes on macroporous alumina substrates by a simple dip-coating process and subsequent consolidation via vapor-phase crystallization. This ultrathinb-oriented ZSM-5 membrane has demonstrated extraordinary water flux combined with high salt rejection in pervaporation desalination for brines containing up to 24 weight % of dissolved NaCl. The ZSM-5 nanosheets may also offer opportunities to developing high-performance battery ion separators, catalysts, adsorbents, and thin-film sensors.

Template-free synthesis of beta zeolite membranes on porous α-Al2O3 supports

2014 ◽  
Vol 50 (64) ◽  
pp. 8834-8837 ◽  
Author(s):  
Yanting Tang ◽  
Xiufeng Liu ◽  
Shifeng Nai ◽  
Baoquan Zhang
Keyword(s):  
Seed Layer ◽  
Secondary Growth ◽  
Zeolite Membrane ◽  
Beta Zeolite ◽  
Zeolite Membranes ◽  
Organic Templates ◽  
Template Free ◽  
Α Al2o3

The preferentially (h0l)-oriented beta zeolite membrane was prepared on the porous α-Al2O3 support by secondary growth of a beta seed layer in the absence of organic templates.

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