Preparation of ZIF-62 polycrystalline and glass membranes for helium separation

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Zhijun Zhao
  • Li Ding
  • Alexander Mundstock
  • Oliver Stölting
  • Sebastian Polarz
  • Haihui Wang
  • Armin Feldhoff

External Research Organisations

  • Tsinghua University
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Details

Original languageEnglish
Article number122677
Number of pages10
JournalJournal of membrane science
Volume700
Early online date19 Mar 2024
Publication statusPublished - May 2024

Abstract

Defects among the grains of MOF polycrystalline membranes lead to non-selective gas transport, thereby reducing their selectivity in gas separation. In this work, ZIF-62 polycrystalline membranes with a well-intergrown structure were prepared on MXene-modified supports. Subsequent thermal treatment transformed the membranes into glass membranes, effectively eliminating non-selective defects at grain boundaries. Due to the incorporation of the MXene film and the vertical positioning of the support during the solvothermal process, only a minimal portion of the glass melt infiltrated into the porous support. Across the temperature range of 303 K–423 K and pressure range of 1 bar–3 bar, the ZIF-62 glass membranes showcased superior helium separation property and long-term chemical stability (resistant to CO2 and H2O). The helium permeance reached approximately 51 GPU, with selectivities against N2 and CH4 being 17.4 and 13.9, respectively, outperforming current MOF membranes.

Keywords

    Gas separation, Helium recovery, MOF glass, MXene, ZIF-62 membrane

ASJC Scopus subject areas

Cite this

Preparation of ZIF-62 polycrystalline and glass membranes for helium separation. / Zhao, Zhijun; Ding, Li; Mundstock, Alexander et al.
In: Journal of membrane science, Vol. 700, 122677, 05.2024.

Research output: Contribution to journalArticleResearchpeer review

Zhao Z, Ding L, Mundstock A, Stölting O, Polarz S, Wang H et al. Preparation of ZIF-62 polycrystalline and glass membranes for helium separation. Journal of membrane science. 2024 May;700:122677. Epub 2024 Mar 19. doi: 10.1016/j.memsci.2024.122677
Zhao, Zhijun ; Ding, Li ; Mundstock, Alexander et al. / Preparation of ZIF-62 polycrystalline and glass membranes for helium separation. In: Journal of membrane science. 2024 ; Vol. 700.
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abstract = "Defects among the grains of MOF polycrystalline membranes lead to non-selective gas transport, thereby reducing their selectivity in gas separation. In this work, ZIF-62 polycrystalline membranes with a well-intergrown structure were prepared on MXene-modified supports. Subsequent thermal treatment transformed the membranes into glass membranes, effectively eliminating non-selective defects at grain boundaries. Due to the incorporation of the MXene film and the vertical positioning of the support during the solvothermal process, only a minimal portion of the glass melt infiltrated into the porous support. Across the temperature range of 303 K–423 K and pressure range of 1 bar–3 bar, the ZIF-62 glass membranes showcased superior helium separation property and long-term chemical stability (resistant to CO2 and H2O). The helium permeance reached approximately 51 GPU, with selectivities against N2 and CH4 being 17.4 and 13.9, respectively, outperforming current MOF membranes.",
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AU - Zhao, Zhijun

AU - Ding, Li

AU - Mundstock, Alexander

AU - Stölting, Oliver

AU - Polarz, Sebastian

AU - Wang, Haihui

AU - Feldhoff, Armin

N1 - Funding Information: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, project number 409987259). The authors thank L. Wagner and Prof. U. Giese for the DSC measurements, Dr. R. Almeev for access to the JSM-7610FPlus scanning electron microscope, and F. Steinbach for the technical assistance during energy-dispersive X-ray experiments.

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N2 - Defects among the grains of MOF polycrystalline membranes lead to non-selective gas transport, thereby reducing their selectivity in gas separation. In this work, ZIF-62 polycrystalline membranes with a well-intergrown structure were prepared on MXene-modified supports. Subsequent thermal treatment transformed the membranes into glass membranes, effectively eliminating non-selective defects at grain boundaries. Due to the incorporation of the MXene film and the vertical positioning of the support during the solvothermal process, only a minimal portion of the glass melt infiltrated into the porous support. Across the temperature range of 303 K–423 K and pressure range of 1 bar–3 bar, the ZIF-62 glass membranes showcased superior helium separation property and long-term chemical stability (resistant to CO2 and H2O). The helium permeance reached approximately 51 GPU, with selectivities against N2 and CH4 being 17.4 and 13.9, respectively, outperforming current MOF membranes.

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