Ion-Exchanged SAPO-34 Membranes for Krypton–Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes

Kwon, Yeon Hye; Min, Byunghyun; Yang, Sheng; Koh, Dong‐Yeun; Bhave, Ramesh R.; Nair, Sankar

doi:10.1021/acsami.7b18244

Cited by 33 publications

(27 citation statements)

References 21 publications

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“…[3b, 4] Membrane separation could make it less energy intensive and economically feasible since it does not involve any phase transformation and allows on-stream processing.S mall pore zeolite (e.g., SAPO-34, SSZ-13, DDR) represents ideal membrane material for CO 2 /Xe separation based on the point view of size exclusion. SAPO-34 zeolite membranes were explored for Kr/Xe [5] and N 2 /Xe [6] separation. However, the SAPO pores would be blocked due to the strong water adsorption from humid feed gas as observed by Noble et al, [7] resulting in an impermeability.T oe liminate the pore blockage,j ust recently,N airsg roup developed high-silica CHA (SSZ-13) zeolite membranes on low-cost alumina hollow fibers for CO 2 /N 2 and CO 2 /CH 4 separation.…”

Section: Introductionmentioning

confidence: 99%

Xenon Recovery by DD3R Zeolite Membranes: Application in Anaesthetics

et al. 2019

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Xe is only produced by cryogenic distillation of air, and its availability is limited by the extremely low abundance. Therefore, Xe recovery after usage is the only way to guarantee sufficient supply and broad application. Herein we demonstrate DD3R zeolite as a benchmark membrane material for CO2/Xe separation. The CO2 permeance after an optimized membrane synthesis is one order magnitude higher than for conventional membranes and is less susceptible to water vapour. The overall membrane performance is dominated by diffusivity selectivity of CO2 over Xe in DD3R zeolite membranes, whereby rigidity of the zeolite structure plays a key role. For relevant anaesthetic composition (<5 % CO2) and condition (humid), CO2 permeance and CO2/Xe selectivity stabilized at 2.0×10−8 mol m−2 s−1 Pa−1 and 67, respectively, during long‐term operation (>320 h). This endows DD3R zeolite membranes great potential for on‐stream CO2 removal from the Xe‐based closed‐circuit anesthesia system. The large cost reduction of up to 4 orders of magnitude by membrane Xe‐recycling (>99+%) allows the use of the precious Xe as anaesthetics gas a viable general option in surgery.

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Section: Introductionmentioning

confidence: 99%

Xenon Recovery by DD3R Zeolite Membranes: Application in Anaesthetics

et al. 2019

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“…The disks had a porosity of 33% and average pore size 87 nm as measured by mercury porosimetry (Figure S7a). The preparation of alumina hollow fibers followed our recent work . The spinning dope suspension had a composition (wt.%) of 38.0 NMP: 6.8 PES: 54.7 Al 2 O 3 : 0.5 PVP.…”

Section: Methodsmentioning

confidence: 99%

Highly Selective SSZ‐13 Zeolite Hollow Fiber Membranes by Ultraviolet Activation at Near‐Ambient Temperature

et al. 2018

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Zeolitic membranes synthesized using organic structure-directing agents (SDAs) require an activation step to remove the SDA and open their porosity. Activation is typically achieved by high-temperature (> 673 K) calcination. This process has multiple disadvantages, including coke formation due to incomplete removal of the SDA as well as the formation of cracks and other defects due to differential thermal expansion of the membrane layer and the underlying support material. Here we report that high-performance hollow fiber membranes of the small-pore (0.38 nm) zeolite SSZ-13 can be produced via UV irradiation to decompose and remove the SDA. Remarkably, UV irradiation allowed com-plete removal of the bulky SDA (trimethyladamantylammonium hydroxide) from the pores at near-ambient conditions, whereas membranes activated by calcination exhibited severe cracking. The UV-activated SSZ-13 membranes showed excellent H 2 /C 3 H 8 and CO 2 /CH 4 mixture selectivities (up to 810 and 110 whereas the conventionally activated membranes showed poor selectivity (< 5). The combined demonstration of hollow fiber membrane synthesis and low-temperature membrane activation of small-pore zeolite membranes is a significant step in the effort to create reliable, scalable, and low-cost fabrication processes for zeolite membranes for gas separations.[a] Dr.

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“…Zeolite molecular sieves, as aluminosilicate crystals, are widely used in ion exchange [11], gas adsorption [12][13][14], and catalysis [15,16] due to their regular structure, high surface area, and large inner pores. Since zeolites have holes connected by a plurality of pore canal structures with the same diameter, organic molecules with smaller size than the pore diameter can be adsorbed, while molecules with larger size than the pore diameter can be excluded, and then the organics can be separated.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Chelerythrine from Toddalia asiatica (L.) Lam. by ZSM-5

Liu

Guo

Zhuo-bing

et al. 2020

Advances in Polymer Technology

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Separation and purification of active components from biomass by inorganic materials during the pretreatment process of hydrothermal conversion are studied in this work. The batch experiment results show that an initial solution pH of 6 favors chelerythrine adsorption, and the optimum adsorbent dosage is 2.0 g. The adsorption mechanism of ZSM-5 for chelerythrine is investigated by adsorption kinetics, isotherm adsorption models, and thermodynamics analysis. The results show that the kinetics data fit the pseudo-second-order model well (R2 = 0.9991), and the intraparticle diffusion model has 3 diffusion stages, preliminarily indicating that chemisorption plays a major role in the adsorption process, and the sorption mechanism includes intraparticle, external, and boundary diffusion. The adsorption isotherms agree well with the Langmuir model, indicating the occurrence of monolayer molecular adsorption during the adsorption process. Meanwhile, the maximum adsorption capacity is 2.327, 2.072, and 1.877 mg/g at different temperatures (288 K, 298 K, and 308 K), respectively. The thermodynamic data demonstrate that the adsorption process is exothermic and spontaneous in nature. These observed results clearly confirm that ZSM-5 has potential superior properties for the enrichment and purification of alkaloids during the pretreatment of biomass.

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Ion-Exchanged SAPO-34 Membranes for Krypton–Xenon Separation: Control of Permeation Properties and Fabrication of Hollow Fiber Membranes

Cited by 33 publications

References 21 publications

Xenon Recovery by DD3R Zeolite Membranes: Application in Anaesthetics

Xenon Recovery by DD3R Zeolite Membranes: Application in Anaesthetics

Highly Selective SSZ‐13 Zeolite Hollow Fiber Membranes by Ultraviolet Activation at Near‐Ambient Temperature

Adsorption of Chelerythrine from Toddalia asiatica (L.) Lam. by ZSM-5

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