Preparation of SSZ-13 membranes with enhanced fluxes using asymmetric alumina supports for N2/CH4 and CO2/CH4 separations

Song, Shigeng; Gao, Feng; Zhang, Yue; Li, Xinping; Zhou, Ming; Wang, Bin; Zhou, Rongfei

doi:10.1016/j.seppur.2018.09.016

Cited by 67 publications

(52 citation statements)

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“…High ideal CO 2 /C 3 H 8 selectivity of over 800 in Figure S8, Supporting Information, indicated that the oriented nanofilm had few defects larger than 4.10 Å (kinetic diameter of propane). The decrease trends of permeance and selectivity through the current oriented nanofilm along with temperature in the separation of CO 2 /CH 4 and CO 2 /N 2 mixtures were the same as those through the reported zeolite CHA [ 17 ] and AlPO‐18 membranes. [ 5c,18 ] In the case of 423 K, the current oriented SAPO‐34 nanofilm displayed CO 2 permeance as high as 4.4 × 10 −6 mol (m 2 s Pa) −1 and CO 2 /N 2 selectivity of 10 for an equimolar CO 2 /N 2 mixture.…”

Section: Introductionsupporting

confidence: 77%

“…Comparison of separation performance of our oriented SAPO‐34 nanofilms with other zeolite films/membranes presented in a) CO 2 /CH 4 selectivity versus permeance and b) CO 2 /N 2 selectivity versus permeance plots. AlPO‐18, [ 5c,15,18,21 ] ● DDR, [ 22 ] ▼ CHA, [ 17c,20b,23 ] ▽ SSZ‐13, [ 18a,b,24 ] △ MFI, [ 25 ] ▲ FAU, [ 26 ] SAPO‐17, [ 19 ] and ■ SAPO‐34 [ 10b,27 ] films/membranes.…”

Section: Introductionmentioning

confidence: 99%

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Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Wang

et al. 2020

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Precise molecular and ion separations depend largely on the size and uniformity of the nanochannels in a defect-free microporous nanofilm. Ordered and perpendicular nanochannels with uniform pore size are assembled into a continuous and defect-free film by a "gel nuclei-less" route. The ultrathin (<50 nm) zeolite nanosheets seeding layer induces the formation of defectfree zeolite nanofilms (500-800 nm) with preferential [100] orientation well-aligned to the transport pathway. The large-area and thin silicoaluminophosphate-34 (SAPO-34) nanofilm consisting of uniform and straight nanochannels shows a milestone CO 2 permeance of ≈1.0 × 10 −5 mol (m 2 s Pa) −1 and high CO 2 /CH 4 and CO 2 /N 2 selectivities of 135 and 41 in equimolar binary mixtures at room temperature and 0.2 MPa feed pressure, respectively. These results suggest that highly oriented and thin SAPO-34 nanofilms prepared from nanosheets might have great potential for CO 2 capture from natural gas, biogas, and flue gas.

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Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Wang

et al. 2020

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“…The synthesis procedure of SSZ-13 seeds was the same as reported in our previous study. 22 All chemicals were used as received without further purification. For a typical synthesis, 21.2 mmol of sodium hydroxide tablets (96%, Sinopharm) and 5.3 mmol of the aluminum hydroxide powder (99%, Wako) were mixed with 2.59 mol of DI water (homemade) with stirring for 1 h to form a homogeneous aluminate solution, and then 42.5 mmol of N,N,N-trimethyl-1-adamantyl ammonium hydroxide (donated as TMAdaOH, 25 wt % in water, the preparation procedure was described in our previous study 44 ) and 106.2 mmol of silica (Ludox TM-40 colloidal silica, 40%, Sigma-Aldrich) were added in the solution.…”

Section: Methodsmentioning

confidence: 99%

“…SSZ-13 is a high-silica zeolite with chabazite (CHA) topology. It has a three-dimensionally connected pore channel with size of 3.8 Å × 3.8 Å, 22 offering a molecular sieving ability for N 2 (3.72 Å) over CH 4 (3.8 Å). Moreover, its high-silica framework owns a good resistance to water vapor.…”

Section: Introductionmentioning

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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“…二次生长法是预先在载体表面涂敷晶种并作为生长中心继续生长成膜的一种合成方法 [20] (图 2), 该方法可缩短合成时间, 提高合成效率, 而且能更好地控制膜层厚度和晶体微观结构。此外, 晶种在载体表面的修饰作用还可减少载体对成膜过程的影响, 避免缺陷的产生。目前国内外从事 CHA 分子筛膜合成研究的主要团队, 基本采用二次生长法, 其中包括最初合成 CHA 分子筛膜的科罗拉多大学的 Falconer 和 Noble 等 [5,[21][22][23] 。针对 SSZ-13 膜的二次生长法合成, 国外课题组例如 Kosinov 和 Choi 等 [14,[24][25][26] 成功合成出薄而均匀且分离性能良好的高硅 SSZ-13 膜; 国内的顾学红、周荣飞、陈祥树等 [27][28][29][30][31][32][33][34]…”

Section: 二次生长法unclassified

Synthesis and Gas Separation of Chabazite Zeolite Membranes

Li¹,

Zhang²,

Zou³

et al. 2021

Journal of Inorganic Materials

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Chabazite (CHA) zeolite membranes exhibit superior performances in light gas separations owing to the eight-membered ring channel structure with small pore size (0.38 nm), adjustable surface characteristics, and high material stability and preparation reproducibility, and have gradually become one of the hot spots of zeolite membrane research in recent years. This review article first introduces the basic characteristics, the two typical CHA zeolite membranes (SAPO-34 and SSZ-13 membranes), then compares the synthesis and preparation methods of CHA zeolite membranes (in-situ synthesis, secondary growth synthesis, microwave heating methods) and analyzes their advantages and disadvantages in application status. The influences of their key synthesis conditions of the secondary growth as themainstream synthesis method on the qualities of SSZ-13 and SAPO-34 membranes have been elaborated in detail, mainly including 1) the seeding conditions, such as carrier type, seeding crystal and seeding approach; 2) the hydrothermal synthesis conditions, such as crystallization time and temperature, water content, silica-to-alumina ratio, structure directing agent, and cation type; 3) the calcination approaches, such as conventional calcination, staged calcination, and rapid heating treatments. After comparative analysis, the preferred synthesis of the above two typical CHA zeolite membranes are proposed. Furthermore, the modulation of membrane surface chemistry is discussed for the enhancement in gas separation, such as silica-to-alumina ratio adjustment, ion exchange, heteroatom substitution, amino-group functionalization, and surface modification. The detailed characteristics of gas separation in various gas mixture systems and the permeation properties of different single gases on CHA zeolite membranes are analyzed and summarized as well. Finally, the future development of CHA zeolite membranes is prospected.

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Preparation of SSZ-13 membranes with enhanced fluxes using asymmetric alumina supports for N2/CH4 and CO2/CH4 separations

Cited by 67 publications

References 44 publications

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

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

Synthesis and Gas Separation of Chabazite Zeolite Membranes

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Preparation of SSZ-13 membranes with enhanced fluxes using asymmetric alumina supports for N2/CH4 and CO2/CH4 separations

Cited by 67 publications

References 44 publications

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO2 Separation

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO2 Separation

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

Synthesis and Gas Separation of Chabazite Zeolite Membranes

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Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

Highly Ordered Nanochannels in a Nanosheet‐Directed Thin Zeolite Nanofilm for Precise and Fast CO₂ Separation

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