Gas permeation through DDR‐type zeolite membranes at high temperatures

Kanezashi, Masakoto; O’Brien-Abraham, Jessica; Lin, Jerry Y S; Suzuki, Kenji

doi:10.1002/aic.11457

Cited by 191 publications

(126 citation statements)

References 31 publications

(34 reference statements)

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“…126 Lin and co-workers have used the CVD technique for postsynthesis modification of MFI and DDR-type membranes. 88,[127][128][129] For small non-adsorbing molecules like H 2 and CO 2 , the transport is governed by Knudsen diffusion. Thus, plugging of large intercrystalline defects by CVD using a molecule like methyldiethoxysilane (MDES) or TEOS increases the H 2 /CO 2 separation factor.…”

Section: Post-synthesis Modificationmentioning

confidence: 99%

Zeolite membranes – a review and comparison with MOFs

et al. 2015

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aThe latest developments in zeolite membranes are reviewed, with an emphasis on the synthesis techniques, including seed assembly and secondary growth methods. This review also discusses the current industrial applications of zeolite membranes, the feasibility of their use in membrane reactors and their hydrothermal stability. Finally, zeolite membranes are compared with metal-organic framework (MOF) membranes and the latest advancements in MOF and mixed matrix membranes are highlighted.

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Section: Post-synthesis Modificationmentioning

confidence: 99%

Zeolite membranes – a review and comparison with MOFs

et al. 2015

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“…[1][2][3][4][5][6] So far, various types of supported zeolite layers, such as MFI, 7,8 DDR, 9 LTA, 10-14 FAU, 15,16 CHA, 17,18 and AFI, 19 have been successfully prepared on different supports. Among these molecular sieve membranes, the zeolite LTA membrane is of special interest.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of LTA molecular sieve membranes on covalently functionalized supports by using diisocyanates as molecular linkers

Huang

Caro

2011

J. Mater. Chem.

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Much effort has been paid towards the preparation of hydrophilic zeolite LTA membranes, and these zeolite LTA membranes have showed excellent performance in hydrophilic separations. However, there are only a few reports on successful shape-selective separations of gas mixtures on zeolite LTA membranes, most separation factors reported so far were lower than the corresponding Knudsen constants. It is often found that zeolite LTA membranes contain inter-crystalline defects to degrade their separation selectivity, which result from the problems that the isolated crystals on the support surface grow together to form a continuous supported LTA layer. In the present work, via urethane bonds formed by the reaction of isocyanate groups with surface hydroxyls, a facile synthesis method is developed for the seeding-free preparation of supported dense zeolite LTA layers by using 1,4-diisocyanate as a molecular binder to anchor the zeolite nutrients onto the support surface. The a-Al 2 O 3 supported zeolite LTA membrane with a thickness of about 3.5 mm displays molecular sieving performance in gas permeation tests.

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“…[1,2] To date, mainly silicatebased zeolite membranes of the structure types MFI, [3] DDR, [4] LTA, [5] and FAU [6] have been synthesized on different substrates and evaluated for single-or multiple-gas permeation. Routes for the synthesis of zeolite membranes can be broadly classified into two categories: [7] in situ and secondary growth synthesis, both of which are derived from the strategy of hydrothermal zeolite synthesis.…”

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confidence: 99%

Ionothermal Synthesis of Aluminophosphate Molecular Sieve Membranes through Substrate Surface Conversion

Tian

et al. 2012

Angew Chem Int Ed

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Applications of zeolite membranes in separation, chemical sensors, and catalytic membrane reactors have led to extensive studies on their fabrication. [1,2] To date, mainly silicatebased zeolite membranes of the structure types MFI, [3] DDR, [4] LTA, [5] and FAU [6] have been synthesized on different substrates and evaluated for single-or multiple-gas permeation. Routes for the synthesis of zeolite membranes can be broadly classified into two categories: [7] in situ and secondary growth synthesis, both of which are derived from the strategy of hydrothermal zeolite synthesis. However, the high autogenous pressure [8] associated with hydrothermal procedures is inconvenient for preparation of zeolite membranes, especially for large-scale production, due to safety concerns and the risk of molecular sieve collapse. On the other hand, although aluminophosphate [9,10] and silicoaluminophosphate [11,12] membranes for gas separation have been prepared, there are few reports on the preparation of aluminophosphate molecular sieve membranes, [9][10][11][12] which suggests that hydrothermal preparation of such membranes may be difficult.Ionothermal synthesis, [13] which uses ionic liquids as reaction media instead of water or organic solvents, allowed highly efficient preparation of aluminophosphate molecular sieves under ambient pressure. [13][14][15] Ionic liquids (ILs) are commonly defined as salts that consist of organic cations and inorganic anions with melting temperatures below 100 8C. [16] ILs are well known as environmentally benign and designable solvents, [17] which endow ionothermal synthesis with interesting features and many potential advantages over the hydrothermal method. As a result of the negligible vapor pressure of ILs, ionothermal synthesis can take place at ambient pressure, which eliminates safety concerns. The organic cation of the IL can act as a structure-directing agent (SDA), [13c] or play a cooperative structure-directing role together with introduced amines and quaternary ammonium compounds. [18][19][20] AEL, AFI, CHA, LTA, and ÀCLO types of aluminophosphate molecular sieves have been successfully synthesized by ionothermal methods.Ionothermal synthesis is a promising method for the preparation of aluminophosphate molecular sieve membranes under ambient pressure. Yan and co-workers prepared AlPO-11 and SAPO-11 films on aluminum alloys as anticorrosion coatings by in situ ionothermal synthesis. [21] To the best of our knowledge, no permeable membrane has been previously prepared on a porous substrate by the ionothermal method. Here we report an ionothermal method for the synthesis of permeable aluminophosphate molecular sieve membranes on porous alumina disks by substrate-surface conversion.Molecular sieve membranes of types AEL, AFI, CHA, and LTA were prepared by placing homemade d-alumina substrates (2.0 mm thickness, 20 mm diameter, and 10 nm average pore size; see Supporting Information for details) in a solution of IL, phosphoric acid, hydrofluoric acid, and, if required, organic amines w...

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Gas permeation through DDR‐type zeolite membranes at high temperatures

Cited by 191 publications

References 31 publications

Zeolite membranes – a review and comparison with MOFs

Zeolite membranes – a review and comparison with MOFs

Facile synthesis of LTA molecular sieve membranes on covalently functionalized supports by using diisocyanates as molecular linkers

Ionothermal Synthesis of Aluminophosphate Molecular Sieve Membranes through Substrate Surface Conversion

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