Recent development of membranes for carbon capture: From materials to asymmetric membranes

Progress in Materials Science, Journal Year: 2024, Volume and Issue: 146, P. 101324 - 101324

Published: June 6, 2024

Language: Английский

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Atomically distributed Al-F3 nanoparticles towards precisely modulating pore size of carbon membranes for gas separation

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 2, 2025

To confront the energy consumption, high performance membrane materials are urgently needed. Carbon molecular sieve (CMS) membranes exhibit superior capability in separating gas mixtures efficiently. However, it remains a grand challenge to precisely tune pore size and distribution of CMS further improve their sieving properties. Herein, we report an approach finely modulating structure by using reactive Al(CH3)3 situ defluorinate polymer precursor form Al-Fx(CH3)3-x matrix, which is converted atomic-level Al2O3 Al-F3 matrix. These nanoparticles play key role regulating suppressing formation unfavorable large pores during pyrolysis, thus enhancing selectivity considerably. The resultant demonstrate H2/CH4 CO2/CH4 192.6, 58.4, respectively, 128% 93% higher than untreated samples, residing far above latest upper bounds. efficiently separate tuning challenging. Here, authors modulate via defluorinated particles pyrolysis.

Language: Английский

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Tuning Fluorination of Carbon Molecular Sieve Membranes with Enhanced Reverse‐Selective Hydrogen Separation From Helium

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 21, 2025

Abstract Membrane technology has been explored for separating helium from hydrogen in natural gas reservoirs, a process that remains extremely challenging due to the sub‐Ångstrom size difference between H 2 and He molecules. Reverse‐selective /He separation membranes offer multiple advantages over conventional helium‐selective membranes, which, however, suffer low selectivity. To address this hurdle, novel approach is proposed tune ultra‐micropores of carbon molecular sieves (CMS) through fluorination polymer precursor. By incorporating ‐CF 3 units into backbone Tröger's base polymers, microporosity CMS tailored reverse‐selective are deployed with remarkable performance, surpassing most reported membranes. These exhibit permeability 1505.2 Barrer notable selectivity 3.8. Barometric sorption tests reveal preferential fluorinated which also demonstrate significantly higher diffusion compared unfluorinated samples. Material studio calculations indicate “slim” molecule penetrates more readily than spherical molecule, thus achieving reverse This design offers promising pathway developing molecularly sieving tackle gas.

Language: Английский

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Hierarchically porous and single Zn atom-embedded carbon molecular sieves for H2 separations

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 7, 2024

Abstract Hierarchically porous materials containing sub-nm ultramicropores with molecular sieving abilities and microcavities high gas diffusivity may realize energy-efficient membranes for separations. However, rationally designing constructing such pores into large-area enabling efficient H 2 separations remains challenging. Here, we report the synthesis utilization of hybrid carbon sieve well-controlled nano- micro-pores single zinc atoms clusters well-dispersed inside nanopores via carbonization supramolecular mixed matrix amorphous crystalline zeolitic imidazolate frameworks. Carbonization temperature is used to fine-tune pore sizes, achieving ultrahigh selectivity /CO (130), /CH 4 (2900), /N (880), /C 6 (7900) stability against water vapor physical aging during a continuous 120-h test.

Language: Английский

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Hydroxyl‐Functionalized Polymers of Intrinsic Microporosity and Dual‐Functionalized Blends for High‐Performance Membrane‐Based Gas Separations

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(51)

Published: Sept. 26, 2024

Membrane technology has shown significant growth during the past two decades in gas separation industry due to its energy-savings, compact and modular design, continuous operation, environmentally benign nature. Robust materials with higher permeability selectivity are key reduce capital operational cost, pushing it forward replace or debottleneck conventional energy-intensive unit operations such as distillation. Recently designed ladder polymers of intrinsic microporosity (PIM) polyimides (PIM-PI) pores <20 Å have demonstrated excellent permeation performance. Here, a series plasticization-resistant PIM-based membrane is reported, including first example hydroxyl-functionalized triptycene- Tröger's base-derived PIM PIM-PI homopolymers dual-functionalized polyimide blends containing hydroxyl- carboxyl-functionalized groups. Specifically, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA)-based extremely high for variety industrially important applications. An optimized blend ─OH ─COOH groups showed permselectivity values 136 CO

Language: Английский

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Molecular Insight into Transport properties of Troger’s Base Based Polyimide Membrane

Journal of Molecular Graphics and Modelling, Journal Year: 2025, Volume and Issue: unknown, P. 108966 - 108966

Published: Jan. 1, 2025

Language: Английский

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Broad Range Thickness Dependence of Gas Separation Properties for Carbon Molecular Sieve Membranes Based on a Hydroxyl-Functionalized Microporous Polyimide

Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 123828 - 123828

Published: Feb. 1, 2025

Language: Английский

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Carbon Molecular Sieve Membranes Derived From Dual‐Cross–linked Polybenzimidazole for Enhanced H₂/CO₂ Separation

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 10, 2025

Abstract The need for efficient CO 2 separation during hydrogen production from fossil fuels drives the development of advanced, energy‐efficient solutions. Membrane technology offers a promising approach separating H , which, however, faces challenge low /CO selectivity. To address this challenge, novel strategy to cross–link polybenzimidazole (PBI) using potassium persulfate (K S O 8 ) is proposed, followed by pyrolysis fabricate highly selective carbon molecular sieve (CMS) membranes. cross–linked PBI‐derived CMS membranes exhibit significantly enhanced permeability and selectivity compared neat PBI‐CMS For instance, membrane prepared PBI 24 h pyrolyzed at 900 °C (denoted as KPBI CMS@900) demonstrates outstanding sieving capability. This achieves an 55 Barrer with 48 tested 100 °C, surpassing its non‐cross–linked counterparts 2008 Robeson upper bound. design principles study provide robust technical foundation persulfate‐cross–linked offer innovative preparing high‐performance

Language: Английский

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Carbon Molecular Sieve Membranes Derived from UV-irradiated Polyimides for Enhanced Molecular Separation and Physical Aging Resistance

Journal of Membrane Science, Journal Year: 2025, Volume and Issue: unknown, P. 124080 - 124080

Published: April 1, 2025

Language: Английский

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The influence of debromination and TR on the microstructure and properties of CMSMs

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 352, P. 128167 - 128167

Published: May 29, 2024

Language: Английский

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