Synthesis of highly c-oriented ZIF-69 membranes by secondary growth and their gas permeation properties

Liu, Yunyang; Zeng, Gaofeng; Pan, Yichang; Lai, Zhiping

doi:10.1016/j.memsci.2011.05.041

Cited by 213 publications

(115 citation statements)

References 32 publications

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“…For example, the structure of ZIF-8 was retained in boiling benzene, methanol and water for several days [2]. The great capacities of ZIFs to adsorb, store and separate gases [4] as well as hydrocarbons [5] have made them promising candidates as molecular sieves [6][7][8], films [9] and membranes [10][11][12][13]. ZIFs have for example high affinity for CO 2 [14].…”

Section: Introductionmentioning

confidence: 99%

Crystal formation and size control of zeolitic imidazolate frameworks with mixed imidazolate linkers

Gustafsson

Zou

2012

J Porous Mater

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The effect of synthesis parameters, such as batch composition and synthesis temperature, on the formation and crystal size of zeolitic imidazolate frameworks (ZIFs) using mixed linkers, imidazole (Im) and benzimidazole (bIm), were studied by X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM). ZIF-7 and ZIF-62 were identified as the main phases and a phase diagram relating the batch composition and the final product was constructed based on XRPD and SEM. The range of batch composition giving rise to ZIF-7 and ZIF-62 was identified from the phase diagram. Changes of crystal size and morphology of ZIF-7 and ZIF-62 in terms of batch composition and synthesis temperature were studied by SEM and different trends were observed for the two ZIFs. Thermogravimetric analysis (TGA) and in situ XRPD showed that ZIF-62 possesses a similar high thermal stability as ZIF-7.

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Section: Introductionmentioning

confidence: 99%

Crystal formation and size control of zeolitic imidazolate frameworks with mixed imidazolate linkers

Gustafsson

Zou

2012

J Porous Mater

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“…The permeance was measured for pure N 2 and CO 2 within a broader pressure difference range (0.4 to 3.5 bars) than in Figure 8A. The gas permeance varies linearly with the applied pressure, and it is markedly reduced from 25 m membranes prepared onto limited alumina supports, which offered an ideal selectivity of 6.9 but with a method that can hardly be extended to large membrane surface area [37], or ZIF-8 MOFs prepared on stainless steel porous tubes, which presented an opposite pure Knudsen-based CO 2 /N 2 selectivity of 0.75 [38].…”

Section: Gas Permeation Tests and Ideal Selectivitymentioning

confidence: 98%

Turning Commercial Ceramic Membranes into a First Stage of Membranes for Post-Combustion CO2 Separation

Cerneaux¹,

Germain²,

Francisco³

et al. 2015

J Membra Sci Technol

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it has been reported that membranes used to be discarded in the early stage of these evaluations, as being considered as inappropriate [14]. However, with the development of both theoretical and experimental works, the solutions provided by membranes have been highlighted, and they happen now to be promising candidates for post-combustion CO 2 capture if some problems are correctly addressed and solved by involving both material science and system design engineering [2,3,[14][15][16]. The challenges listed by these reports are the following: (i) membranes must display high selectivity toward CO 2 -at least 50-, (ii) it would be suitable to overcome the low CO 2 concentration in the feed flow (~ 12%), (iii) the large amount of gaseous or aerosol water (25%) present in flue gas would foul the membranes stages if not removed or drastically reduced beforehand, (iv) the low pressure of the feed gas (~ 1 bar) reduces the CO 2 recovery, which is a major drawback for low permeance membranes, and (v) the raw flue gas, even after the gas cleaning and desulfurization through the FGD stage, still contain corrosive components that will destroy polymer membranes if directly exposed. AbstractThis report describes how commercial tubular ceramic membranes, initially designed for liquid filtration, can be modified to provide the core separation components of a first stage of flue gas treatment and enrichment in post-combustion CO 2 separation. Commercially available tubular NanoFiltration (NF) ceramic membranes were turned into a membrane for CO 2 separation by a two-step process including additional ceramic coating and chemical grafting. The combination of ceramic coating and chemical grafting drastically modify the membrane properties and turn the membrane initially designed for liquid filtration into a membrane that displays CO 2 vs N 2 selectivity at the opposite of Knudsen-based selectivity, with a CO 2 :N 2 ideal selectivity of 2.3. A second step of this study addressed the reduction of membrane cost, by starting with a low ultrafiltration (UF) 200 nm ceramic support specifically manufactured for this application in place of a NF membrane. After successful coating of a 5 nm and a 1 nm ceramic membranes, this membrane, grafted with a commercial fluorosilane molecule was tested in pure gas permeation of CO 2 and N 2 , with an ideal selectivity CO 2 :N 2 =3. Finally, the same membrane, grafted with glymo, was tested against separation of a CO 2 (20%):N 2 (80%) mixture, and as a function of the permeation stage-cut. A CO 2 :N 2 selectivity of 4 was obtained for a stage-cut of 0.5, and even higher (CO 2 :N 2 selectivity=14) for low stage-cuts usually used for testing dense polymer membranes. These results demonstrate that commercial ceramic porous membranes can be used as starting elements for a first stage of CO 2 post-combustion gas cleaning and CO 2 enrichment.

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“…13,16 Porous fillers act as molecular sieving agents separating gas molecules by their size or shape. 11,13,17,18 These porous inorganic particles exhibit high permeability and selectivity above the Robesons upper bound due to their small precise apertures. These highly selective porous fillers allow passing the desired components making the permselectivity higher compared with a polymeric membrane.…”

Section: Fabrication and Characterization Of Mmmsmentioning

confidence: 99%

Mixed Matrix Membranes for Gas Separation Applications

Carreon¹,

Dahe²,

Feng³

et al. 2017

Membranes for Gas Separations

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Mixed matrix membranes (MMMs) have gained lot of interest in the research community over the last few years in order to overcome the performance trade-off shown by the polymeric membranes. An MMM utilizes the benefits of both polymeric and inorganic materials and has the potential to show very high performance without much increase in the cost of fabrication. But the fabrication of an MMM without conceding the mechanical properties is very challenging. In this chapter, the materials selection and fabrication techniques of MMM in both flat sheet and hollow fiber configurations are discussed. Formation of defects at the interface is one of the biggest challenges in fabricating the MMM. Different techniques used in the literature to compatibilize the polymer and particle were summarized. In addition, the recent progress of MMM for gas separation applications and performance prediction models were provided in detail.

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Synthesis of highly c-oriented ZIF-69 membranes by secondary growth and their gas permeation properties

Cited by 213 publications

References 32 publications

Crystal formation and size control of zeolitic imidazolate frameworks with mixed imidazolate linkers

Crystal formation and size control of zeolitic imidazolate frameworks with mixed imidazolate linkers

Turning Commercial Ceramic Membranes into a First Stage of Membranes for Post-Combustion CO2 Separation

Mixed Matrix Membranes for Gas Separation Applications

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