scholarly journals Synthesis and Performance of Deca- Dodecasil 3 Rhombohedral (DDR)-Type Zeolite Membrane In CO2 Separation– A Review

2015 ◽  
Vol 14 (2) ◽  
pp. 48 ◽  
Author(s):  
Muhammad Mubashir ◽  
Yeong Yin Fong ◽  
Lau Kok Keong ◽  
Mohd. Azmi Bin Sharrif
Keyword(s):  
Secondary Growth ◽  
High Energy ◽  
Zeolite Membrane ◽  
Co2 Separation ◽  
Inorganic Membranes ◽  
Zeolite Membranes ◽  
Type Zeolite ◽  
And Performance ◽  
Cryogenic Distillation ◽  
Growth Methods

CO2 capture technologies including absorption, adsorption, and cryogenic distillation are reported. Conventional technologies for CO2 separation from natural gas have several disadvantages including high cost, high maintenance, occupy more space and consume high energy. Thus, membrane technology is introduced to separate CO2 due to their several advantages over conventional separation techniques. Inorganic membranes exhibit high thermal stability, chemical stability, permeability and selectivity for CO2 and CH4 separation as compared to other type of membranes. Zeolite membranes are potential for CO2 separation due to their characteristics such as, well define the pore structure and molecular sieving property. Among the zeolite membranes, DDR membranes exhibit highest selectivity for CO2 and CH4 separation. DDR membranes are synthesized by conventional hydrothermal and secondary growth methods. These methods required very long synthesis duration (25 days) due to extremely low nucleation and crystal growth rate of DDR zeolite. In this review, synthesis and performance of DDR membrane in CO2 separation from CH4 reported by various researchers are discussed. Challenges and upcoming guidelines related to the synthesis DDR membrane and performance of DDR membrane also included.

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.

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.

Fabrication And Application Of Zeolite Membranes

2002 ◽  
Vol 752 ◽  
Author(s):  
Hidetoshi Kita
Keyword(s):  
Microwave Heating ◽  
Porous Ceramic ◽  
Heating System ◽  
Zeolite Membrane ◽  
Conventional Heating ◽  
Organic Liquids ◽  
Zeolite Membranes ◽  
Tubular Type ◽  
Vapor Permeation ◽  
Type Zeolite

ABSTRACTZeolite Membranes Were Prepared On A Porous Ceramic Support By Hydrothermal Synthesis Using Conventional Heating System And Microwave Heating. Naa And T Type Zeolite Membranes Were Highly Selective For Permeating Water Preferentially With The High Permeation Flux, While Silicalite Membranes Exhibited Preferential Organic Compound Permeation From Water Such As Ethanol/Water. Nay And Nax Zeolite Membranes Showed A High Alcohol Selectivity For Several Feed Mixtures With Methanol Or Ethanol And A High Benzene Selectivity For Benzene/Cyclohexane And Benzene/N-Hexane Separation. The Performance Of The Zeolite Membranes Was The Most Favorable One For Pervaporation Membranes Which Have Been Published So Far And A Tubular Type Module Using A Type Zeolite Membrane For Dehydration Of Organic Liquids Has Been Put Into Industrial Operation. The Tubular Type Pervaporation And Vapor Permeation Module Can Produce 99.8 Wt% Ethanol From 600 L/H, 90 Wt% Ethanol Feed At 120 °C. For The Mass Production Of Zeolite Membrane A New Synthetic Method Using A Microwave Heating Is Also Proposed.

Synthesis and performance of microporous inorganic membranes for CO2 separation: a review

2013 ◽  
Vol 20 (6) ◽  
pp. 1457-1475 ◽  
Author(s):  
Zee Ying Yeo ◽  
Thiam Leng Chew ◽  
Peng Wei Zhu ◽  
Abdul Rahman Mohamed ◽  
Siang-Piao Chai
Keyword(s):  
Co2 Separation ◽  
Inorganic Membranes ◽  
And Performance

scholarly journals Influence of Organic Solvent Species on Dehydration Behaviors of NaA-Type Zeolite Membrane

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 347
Author(s):  
Yasuhisa Hasegawa ◽  
Wakako Matsuura ◽  
Chie Abe ◽  
Ayumi Ikeda
Keyword(s):  
Ethanol Solution ◽  
Zeolite Membrane ◽  
Effect Of Temperature ◽  
Dimethyl Formamide ◽  
Permeation Flux ◽  
Vapor Pressures ◽  
Zeolite Membranes ◽  
Separation Factors ◽  
Type Zeolite

In this study, an NaA-type zeolite membrane was prepared, and the dehydration performances of the membrane were determined by the pervaporation for several organic solvents to understand the lower dehydration performances of zeolite membranes for NMP solutions than those for alcohols. For a 90 wt% ethanol solution at 348 K, the permeation flux and separation factor of the membrane were 3.82 kg m−2 h−1 and 73,800, respectively. The high dehydration performances were also obtained for alcohols and low boiling solvents (acetonitrile, acetone, methyl ethyl ketone (MEK) and tetrahydrofuran (THF)). However, the permeation flux and separation factors decreased significantly for high boiling solvents, such as N,N-dimethylacetamide (DMA), N,N-dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP). The influences of the water content and temperature on the dehydration performances for the NMP solutions were determined to understand the lower dehydration performances for those solvents. Those results suggest that the lower dehydration performances for the high boiling solvents were attributed to the lower vapor pressures of water and the higher permeances of those solvents. Furthermore, this study proposes that the permeation behaviors through zeolite membranes could be understood by the determination of the effect of temperature on the permeance of individual components.

scholarly journals Prevention in Thermal Crack Formation in Chabazite (CHA) Zeolite Membrane by Developing Thin Top Zeolite and Thick Intermediate Layers

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2113
Author(s):  
Min-Zy Kim ◽  
Syed Fakhar Alam ◽  
Devipriyanka Arepalli ◽  
Aafaq ur Rehman ◽  
Won-Youl Choi ◽  
...  
Keyword(s):  
Intermediate Layer ◽  
Secondary Growth ◽  
Particle Diameter ◽  
Zeolite Membrane ◽  
Average Particle ◽  
Alumina Support ◽  
Infiltration Process ◽  
Zeolite Membranes ◽  
Thermal Cracks ◽  
Intermediate Layers

Chabazite (CHA) zeolite membranes with an intermediate layer of various thicknesses were prepared using planetary-milled seeds with an average particle diameter of 300, 250, 200, 140, and 120 nm. The 120 nm seed sample also contained several smaller particles with a diameter of 20 nm. Such small seeds deeply penetrated into the pore channels of the α-alumina support during the vacuum-assisted infiltration process. During the secondary growth, the penetrated seeds formed a thick intermediate layer exiting between the zeolite layer and support. A decrease in seed size increased the penetration depth of seeds and the thickness of the intermediate layer, while the thickness of seed coating and zeolite layers was decreased. CHA zeolite membranes with a thin top zeoliate layer and a thick intermediate layer showed an excellent water/ethanol separation factor (>10,000) for 90 wt.% ethanol at 70 ℃ with a total flux of 1.5 kg m−2 h−1. There was no observation of thermal cracks/defects on the zeolite separation layer. The thick intermediate layer effectively suppressed the formation of thermal cracks during heating, since the tensile stress induced in the zeolite layer was well compensated by the compressive stress on the support. Therefore, it was successfully proven that controlling the microstructure of top surface and intermediate layers is an effective approach to improve the thermal stability of the CHA zeolite membrane.

scholarly journals Making of Nanopore NaA Zeolite Membranes for Saline Wastewater Treatment

2017 ◽  
Vol 16 (2) ◽  
pp. 59
Author(s):  
Mansoor Kazemimoghadam
Keyword(s):  
Xrd Analysis ◽  
Zeolite Membrane ◽  
Saline Wastewater ◽  
Operation Condition ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Zeolite Naa ◽  
Temperature Rate ◽  
And Performance ◽  
Membrane Structure And Performance

Zeolite membranes have been studied extensively for more than fifteen years, mainly focusing on gas separation and liquid pervaporation processes. Recently, molecular dynamic simulation has shown that zeolite membranes are theoretically suitable for ion removal from aqueous solutions. This work proposes to use zeolite membranes for desalination of saline recycled wastewater for the possibility of avoiding the costly treatment needed for saline wastewater by Conventional approaches. NaA zeolite membrane indicates that it may be possible to simultaneously separate ions and dissolved organic compounds from water by pervaporation (PV) processes. NaA zeolite membranes composed of a continuous intergrowth of NaA zeolite crystals have been prepared hydro thermally on the surface of porous tubular supports. In this research, synthesis of zeolite NaA membrane was investigated. SEM and XRD analysis have been used to confirm zeolite NaA membrane formation. Membrane performance has been evaluated using an experimental pervaporation setup. Effects of operation condition (temperature, rate and pressure) on the membrane structure and performance have been investigated for NaA zeolite membranes grown onto seeded mullite supports.

scholarly journals Development of Methanol Permselective FAU-Type Zeolite Membranes and Their Permeation and Separation Performances

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 627
Author(s):  
Ayumi Ikeda ◽  
Chie Abe ◽  
Wakako Matsuura ◽  
Yasuhisa Hasegawa
Keyword(s):  
Separation Factor ◽  
Carbon Number ◽  
Zeolite Membrane ◽  
Separation Performance ◽  
Solvent Mixtures ◽  
Permeation Flux ◽  
Aqueous Mixtures ◽  
Chemical Production ◽  
Zeolite Membranes ◽  
Type Zeolite

The separation of non-aqueous mixtures is important for chemical production, and zeolite membranes have great potential for energy-efficient separation. In this study, the influence of the framework structure and composition of zeolites on the permeation and separation performance of methanol through zeolite membranes were investigated to develop a methanol permselective zeolite membrane. As a result, the FAU-type zeolite membrane prepared using a solution with a composition of 10 SiO2:1 Al2O3:17 Na2O:1000 H2O showed the highest permeation flux of 86,600 μmol m−2 s−1 and a separation factor of 6020 for a 10 wt% methanol/methyl hexanoate mixture at 353 K. The membrane showed a molecular sieving effect, reducing the single permeation flux of alcohol with molecular size for single-component alcohols. Moreover, the permeation flux of methanol and the separation factor increased with an increase in the carbon number of the alcohols and methyl esters containing 10 wt% methanol. In this study, the permeation behavior of FAU-type zeolite membranes was also discussed based on permeation data. These results suggest that the FAU-type zeolite membrane has the potential to separate organic solvent mixtures, such as solvent recycling and membrane reactors.

scholarly journals Halloysite nanotube-based electrospun ceramic nanofibre mat: a novel support for zeolite membranes

2016 ◽  
Vol 3 (12) ◽  
pp. 160552 ◽  
Author(s):  
Zhuwen Chen ◽  
Jiaying Zeng ◽  
Dong Lv ◽  
Jinqiang Gao ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Secondary Growth ◽  
Halloysite Nanotubes ◽  
Sintering Process ◽  
Zeolite Membranes ◽  
Halloysite Nanotube ◽  
Narrow Pore Size Distribution ◽  
Growth Method ◽  
And Performance ◽  
Interconnected Pore

Some key parameters of supports such as porosity, pore shape and size are of great importance for fabrication and performance of zeolite membranes. In this study, we fabricated millimetre-thick, self-standing electrospun ceramic nanofibre mats and employed them as a novel support for zeolite membranes. The nanofibre mats were prepared by electrospinning a halloysite nanotubes/polyvinyl pyrrolidone composite followed by a programmed sintering process. The interwoven nanofibre mats possess up to 80% porosity, narrow pore size distribution, low pore tortuosity and highly interconnected pore structure. Compared with the commercial α-Al 2 O 3 supports prepared by powder compaction and sintering, the halloysite nanotube-based mats (HNMs) show higher flux, better adsorption of zeolite seeds, adhesion of zeolite membranes and lower Al leaching. Four types of zeolite membranes supported on HNMs have been successfully synthesized with either in situ crystallization or a secondary growth method, demonstrating good universality of HNMs for supporting zeolite membranes.

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