Composite membranes with a highly selective polymer skin for hydrogen separation

Wijenayake, Sumudu N.; Panapitiya, Nimanka P.; Nguyen, Cindy N.; Yu, Hao; Balkus, Kenneth J.; Musselman, Inga H.; Ferraris, John P.

doi:10.1016/j.seppur.2014.08.015

Cited by 23 publications

(11 citation statements)

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“…30 Although MMMs may exploit advantages of both the polymeric and inorganic portions, the fabrication of defect-free MMMs is still challenging due to possible existence of chain rigidification, pore blockage and nonselective interfacial voids. [34][35][36][37][38][39][40][41][42][43] For PIM-1 based MMMs, the incorporation of racemic CC3 nanocrystals, ZIF-8 and Ti exchanged UiO-66 have been investigated. They possess good thermal stability and better affinity towards polymeric materials.…”

Section: Figurementioning

confidence: 99%

“…34,35 Incorporating MOFs inside membranes such as polybenzimidazole, polyimide and ionic liquids may improve either or both permeability and gas pair selectivity. [34][35][36][37][38][39][40][41][42][43] For PIM-1 based MMMs, the incorporation of racemic CC3 nanocrystals, ZIF-8 and Ti exchanged UiO-66 have been investigated. [44][45][46] In the case of CC3, although the resultant MMM had slightly improved gas permeability and CO 2 /N 2 selectivity, the improvements were restrained by the intrinsic properties of the nanocrystal.…”

Section: Introductionmentioning

confidence: 99%

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Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

2015

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We have studied the mixed matrix membranes (MMMs) consisting of zeolite imidazolate framework-71 (ZIF-71, Zn(cbIm) 2 ) and polymer of intrinsic microporosity (PIM-1) with and without ultraviolet (UV) irradiation for various gas separations. Well compatible MMMs are formed between ZIF-71 nanoparticles and PIM-1. The incorporation of ZIF-71 considerably enhances the gas permeability without compromising the gas pair selectivities of O 2 /N 2 , CO 2 /N 2 and CO 2 /CH 4 . The PIM-1 comprising 30 wt% ZIF-71 exhibits a 154% increase in CO 2 permeability. An excellent agreement is found between the measured permeability and the Maxwell prediction. FESEM and PAS confirm the formation of an ultrathin dense layer at the membrane surface after the UV treatment.The photo-oxidative PIM-1 has CO 2 /CH 4 , CO 2 /N 2 and O 2 /N 2 selectivities of 34.1, 29.8 and 6.7, respectively, while the UV-treated MMMs possess much higher permeabilities compared to those of photo-oxidative PIM-1 with comparable gas pair selectivities.Under mixed gas tests, the UV treated PIM-1 containing 20 wt% ZIF-71 has a CO 2 permeability of around 2000 barrers and a CO 2 /CH 4 selectivity of 32. This performance outperforms PIM-1 and UV treated PIM membranes. The UV-PIM-1/ZIF-71 membranes have superior separation performance with both high permeability and selectivity for CO 2 /CH 4 or other gas pair separation. 4 carboxylate, thioamide and aromatic nitrile groups. 11, 15-17 PIM-1 with those pendant substituents exhibited lower permeability but slightly increased or comparable selectivity.Cross-linking PIM-1 by either a nitrene reaction in the presence of diazide cross-linker or through the thermal treatment of carboxylated PIM-1 helped increase the CO 2 /N 2 selectivity and reduce the plasticization at elevated CO 2 partial pressures. 18 Polymer blending with polyetherimide or polyimide was another direct way to enhance PIM-1's selectivity, but the miscibility and resulted permeability were largely affected by blending materials. 19,20 In addition, syntheses of new monomers (with different unit lengths or spiro-centre angles) and incorporation of other polymer structures (polyimide, spirobischromane, tetrazoles) inside the monomers were also investigated to obtain PIMs with higher selectivity. 11, 21-23 Materials with a high fractional free volume such as PIM-1 are generally subjected to severe physical aging. 24 To suppress the aging process, a microporous microparticle (porous aromatic framework, PAF) was incorporated into PIM-1. The resultant selectivity increased along with aging while the permeability was much less affected. 25Compared to the aforementioned modifications, ultraviolet (UV) irradiation is a more straightforward method to improve the membrane selectivity without involving additional polymers. 24, 26 Liu et al and Li et al were pioneers in studying the UV treatment to increase PIM-1 selectivity but the permeability was largely sacrificed. 27, 28 After being treated by UV, the CO 2 /N 2 and CO 2 /CH 4 selectivity increased, but the CO 2 ...

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

2015

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“…For example, ZIF-71 has an aperture size of 4.2 Å. [109] 6FDA-durene/ZIF-71 (10) was cross-linked with tris(2-aminoethyl) amine (TAEA) vapor for 1 hr, which increased H 2 /CO 2 selectivity to 50 and retained H 2 permeability at 270 Barrer at 35 C. [67,110] MMMs containing 6FDA-durene and ZIF-8 [111,112] or Matrimid and ZIF-90 [113] were cross-linked with EDA vapor and achieved superior separation performance at 35 C. However, the cross-linking with diamine is reversible at high temperatures, causing a dramatic decrease of H 2 /CO 2 selectivity at 150 C for 6FDAdurene/ZIF-71 (10) (cf. Table 4).…”

Section: Mmms With Enhanced H 2 /Co 2 Diffusivity Selectivitymentioning

confidence: 99%

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

Pal

Nguyen

et al. 2020

Journal of Polymer Science

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Over the last two decades, polymers with superior H2/CO2 separation properties at 100–300 °C have gathered significant interest for H2 purification and CO2 capture. This timely review presents various strategies adopted to molecularly engineer polymers for this application. We first elucidate the Robeson's upper bound at elevated temperatures for H2/CO2 separation and the advantages of high‐temperature operation (such as improved solubility selectivity and absence of CO2 plasticization), compared with conventional membrane gas separations at ~35 °C. Second, we describe commercially relevant membranes for the separation and highlight materials with free volumes tuned to discriminate H2 and CO2, including functional polymers (such as polybenzimidazole) and engineered polymers by cross‐linking, blending, thermal treatment, thermal rearrangement, and carbonization. Third, we succinctly discuss mixed matrix materials containing size‐sieving or H2‐sorptive nanofillers with attractive H2/CO2 separation properties.

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“…To overcome this problem, PBI was loaded with ZIF-8 particles in a dual-layer hollow fiber configuration (Yang, Shi, & Chung, 2012). The same MOF in FDA-based polyimide yielded intrinsic H 2 /CO 2 selectivity equal to 29 (Wijenayake et al, 2014).…”

Section: Hybrid Materialsmentioning

confidence: 99%

Polymeric membranes for the purification of hydrogen

Bernardo

Jansen

2015

Compendium of Hydrogen Energy

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Composite membranes with a highly selective polymer skin for hydrogen separation

Cited by 23 publications

References 64 publications

Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C

Polymeric membranes for the purification of hydrogen

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Composite membranes with a highly selective polymer skin for hydrogen separation

Cited by 23 publications

References 64 publications

Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

Photo-oxidative PIM-1 based mixed matrix membranes with superior gas separation performance

Molecularly engineering polymeric membranes for H2/CO2 separation at 100–300 °C

Polymeric membranes for the purification of hydrogen

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Product

Resources

About

Molecularly engineering polymeric membranes for H₂/CO₂ separation at 100–300 °C