Design of Silica Networks Using Organic‐Inorganic Hybrid Alkoxides for Highly Permeable Hydrogen Separation Membranes

Kanezashi, Masakoto; Yada, Kazuya; Yoshioka, Tomohisa; Tsuru, Toshinori

doi:10.1002/9780470584354.ch21

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“…Examples include H 2 /CO 2 and H 2 /N 2 separation from the product of steam reforming of hydrocarbons, purging CH 4 and Ar from the recycle stream in ammonia synthesis and recovery of H 2 from the industrial off-gas (20)(21)(22)(23). The state-of-the-art membranes for hydrogen sieving at high temperature are based on rigid polymers such as polybenzimidazole (PBI) (24,25), zeolites (14,26,27), amorphous silica (28)(29)(30), and dense Pd films (31)(32)(33). PBI membranes yield low H 2 permeance, while the Pd-based membranes suffer from stability issue in the presence of contaminants (H 2 S, CO, and hydrocarbons).…”

Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of crystalline g-C ₃ N ₄ nanosheets and high-temperature H ₂ sieving from assembled films

et al. 2020

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Poly(triazine imide) (PTI), a crystalline g-C3N4, hosting two-dimensional nanoporous structure with an electron density gap of 0.34 nm, is highly promising for high-temperature hydrogen sieving because of its high chemical and thermal robustness. Currently, layered PTI is synthesized in potentially unsafe vacuum ampules in milligram quantities. Here, we demonstrate a scalable and safe ambient pressure synthesis route leading to several grams of layered PTI platelets in a single batch with 70% yield with respect to the precursor. Solvent exfoliation under anhydrous conditions led to single-layer PTI nanosheets evidenced by the observation of triangular g-C3N4 nanopores. Gas permeation studies confirm that PTI nanopores can sieve He and H2 from larger molecules. Last, high-temperature H2 sieving from PTI nanosheet–based membranes, prepared by the scalable filter coating technique, is demonstrated with H2 permeance reaching 1500 gas permeation units, with H2/CO2, H2/N2, and H2/CH4 selectivities reaching 10, 50, and 60, respectively, at 250°C.

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Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of crystalline g-C ₃ N ₄ nanosheets and high-temperature H ₂ sieving from assembled films

et al. 2020

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Design of Silica Networks Using Organic‐Inorganic Hybrid Alkoxides for Highly Permeable Hydrogen Separation Membranes

Cited by 1 publication

References 22 publications

Large-scale synthesis of crystalline g-C ₃ N ₄ nanosheets and high-temperature H ₂ sieving from assembled films

Large-scale synthesis of crystalline g-C ₃ N ₄ nanosheets and high-temperature H ₂ sieving from assembled films

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Design of Silica Networks Using Organic‐Inorganic Hybrid Alkoxides for Highly Permeable Hydrogen Separation Membranes

Cited by 1 publication

References 22 publications

Large-scale synthesis of crystalline g-C 3 N 4 nanosheets and high-temperature H 2 sieving from assembled films

Large-scale synthesis of crystalline g-C 3 N 4 nanosheets and high-temperature H 2 sieving from assembled films

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Large-scale synthesis of crystalline g-C ₃ N ₄ nanosheets and high-temperature H ₂ sieving from assembled films

Large-scale synthesis of crystalline g-C ₃ N ₄ nanosheets and high-temperature H ₂ sieving from assembled films