A new seeding method, dry rolling applied to synthesize SAPO-34 zeolite membrane for nitrogen/methane separation

Alam, Syed Fakhar; Kim, Min-Zy; Kim, Young Jin; Rehman, Aafaq ur; Arepalli, Devipriyanka; Sharma, Pankaj; Yeo, Jeong-Gu; Lee, Jin-Seok; Kim, Hyunuk; Cho, Churl-Hee

doi:10.1016/j.memsci.2020.117825

Cited by 26 publications

(24 citation statements)

References 78 publications

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“…CHA-type zeolite framework is a 3-dimensional interconnected microporous system with an accessible 3.8 × 3.8 Å window of small eight-membered rings and large ellipsoidal 6.7 × 10 Å cavities [ 11 ]. Pure-silica (Si-CHA) [ 12 ], aluminosilicate (chabazite [ 13 ] and SSZ-13 [ 14 ]) and silicoaluminophosphate (SAPO-34) [ 15 ] belong to the CHA-type zeolite. The chabazite zeolite with a Si/Al molar ratio of 2 to 5 shows a higher acid-resistance in solvent dehydration compared to the commercially available NaA zeolite membrane with a Si/Al molar ratio of 1 [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Many different SAPOs having a wide variety of structures, including AEI, AFI, and CHA have been reported by researchers [4]. SAPO-34 has a CHA-type structure with eight ring channels and a uniform pore size of 3.8 × 3.8 Ǻ [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…Researchers have reported it in a variety of applications, including catalysts [8,9], heat and thermo-chemical storage materials [10,11], and synthesized as gas separation membranes for natural gas sweetening [6,12,13] , H 2 enrichment [14,15], and noble gases collection [16,17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

et al. 2021

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Two-dimensional SAPO-34 molecular sieves were synthesized by microwave hydrothermal process. The concentrations of structure directing agent (SDA), phosphoric acid, and silicon in the gel solution were varied and their effect on phase, shape, and composition of synthesized particles was studied. The synthesized particles were characterized by various techniques using SEM, XRD, BET, EDX, and NH3-TPD. Various morphologies of particles including isotropic, hyper rectangle, and nanoplates were obtained. It was found that the Si/Al ratio of the SAPO-34 particles was in a direct relationship with the density of acid sites. Moreover, the gel composition and preparation affected the chemistry of the synthesized particles. The slow addition of phosphoric acid improved the homogeneity of synthesis gel and resulted in SAPO-34 nanoplates with high density of acid sites, 3.482 mmol/g. The SAPO-34 nanoplates are expected to serve as a high performance catalyst due to the low mass transfer resistance and the high density of active sites.

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“…In order to eliminate defects and improve the quality of the membrane, various membrane preparation methods [5][6][7][8] and post-treatment techniques [9][10][11][12] have been developed to synthesize and/or modify zeolite membranes. Recently, Wei et al eliminated the defects caused by bubbles by pre-degassing the synthesis system before the pressure-driven hydrothermal synthesis, 13 and then modied the zeolite membranes with the help of the space network structure formed by methylcellulose at high temperature.…”

Section: Introductionmentioning

confidence: 99%

In situ constructed zeolite membranes on rough supports with the assistance of reticulated hydrotalcite interlayer

et al. 2021

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A new seeding method, dry rolling applied to synthesize SAPO-34 zeolite membrane for nitrogen/methane separation

Cited by 26 publications

References 78 publications

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

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

Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density

In situ constructed zeolite membranes on rough supports with the assistance of reticulated hydrotalcite interlayer

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