Defect-free high-silica CHA zeolite membranes with high selectivity for light gas separation

Karakiliç, Pelin; Wang, Xuerui; Kapteijn, Freek; Nijmeijer, Arian; Winnubst, Louis

doi:10.1016/j.memsci.2019.05.047

Cited by 50 publications

(13 citation statements)

References 46 publications

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“…SSZ-13 membranes have attracted many interests of researchers ,− ,,− for gas separations due to their high separation performance and good resistance to water vapor. All of the SSZ-13 membranes were prepared by conventional hydrothermal synthesis where the substrates were fully immersed in a large volume of the gel/solution.…”

Section: Results and Discussionmentioning

confidence: 99%

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

Liu

et al. 2020

Energy Fuels

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Thin and high-quality SSZ-13 membranes were synthesized by the steam-assisted conversion (SAC) method for the first time. More than 95% gel/solution was saved for membrane growth compared with conventional hydrothermal synthesis. Another advantage for the SAC method was that the competitive crystallization between the bulk solution and support was eliminated. The thickness of SSZ-13 membranes was well controlled from 1.2 to 3.0 μm by the dilution of sucked solution and synthesis time. Three membranes prepared under optimized conditions displayed N 2 permeances of (1.4 ± 0.12) × 10 −7 mol m −2 s −1 Pa −1 (∼418 GPU), N 2 /CH 4 selectivities of 14.8 ± 0.45 and a separation index of 0.19 ± 0.02 mol m −2 s −1 at 298 K, and 0.2 MPa pressure drop for an equimolar N 2 /CH 4 mixture. The membranes synthesis by the SAC method had a good reproducibility. Such separation performances of current SSZ-13 membranes were beyond the upper bound for N 2 /CH 4 separation among the reported membranes. The influences of temperature, pressure drop, and feed flow rate on separation performance of the membranes were investigated. High-pressure N 2 /CH 4 separation was also reported using SSZ-13 membranes at the pressure drop up to 2.5 MPa.

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Section: Results and Discussionmentioning

confidence: 99%

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

Liu

et al. 2020

Energy Fuels

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“…The traditional way to remove TMAdaOH from the membrane was calcination at 550 °C in air for about 10 h, ,, which resulted in defects for mismatch of the thermal expansion coefficient between the membrane and the support. An improved way to reduce defects was calcination in oxygen , or pretreatment with ozonication, , but it needed more investment in equipment. Rapid thermal processing has been reported recently to avoid the formation of defects .…”

Section: Introductionmentioning

confidence: 99%

Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO₂/CH₄ Gas Separation

Wang

Zhu

et al. 2022

ACS Omega

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Hydrothermal synthesis with an organic template of N , N , N trimethyl-1-adamantammonium hydroxide (TMAdaOH) is the most commonly used method to prepare an SSZ-13 zeolite membrane. In this paper, the synthesized membrane was treated in heated sodium chloride to remove TMAdaOH instead of calcination in air. The surface of the membrane was modified by the heated NaCl and resulted in an improved CO 2 /CH 4 gas separation selectivity. TMAda + in the channels of SSZ-13 zeolite decomposed completely, and the treatment time was shortened significantly compared with calcination in air. The recrystallization of zeolite reacting with heated NaCl was the possible reason for the improved gas separation performance of the membrane.

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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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Defect-free high-silica CHA zeolite membranes with high selectivity for light gas separation

Cited by 50 publications

References 46 publications

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO₂/CH₄ Gas Separation

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

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Defect-free high-silica CHA zeolite membranes with high selectivity for light gas separation

Cited by 50 publications

References 46 publications

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N2/CH4 Separation

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N2/CH4 Separation

Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO2/CH4 Gas Separation

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

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An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

An Effective Approach to Synthesize High-Performance SSZ-13 Membranes Using the Steam-Assisted Conversion Method for N₂/CH₄ Separation

Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO₂/CH₄ Gas Separation