A MOF-74 / biphenyl bridge organic silicon hybrid membrane and a preparation method and application thereof

By preparing a MOF-74/biphenyl bridged organosilicon hybrid membrane and optimizing the pore structure, the problem of MOF-74 adsorption sites being buried in the existing technology was solved, and the selectivity and flux of C3H6/C3H8 separation were improved, making it suitable for the field of gas separation.

CN117463173BActive Publication Date: 2026-06-12CHANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGZHOU UNIV
Filing Date
2023-10-24
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

In existing technologies, aromatic functionalized organosilicon materials have small interstitial spaces, and the adsorption sites are easily buried after doping with MOF-74, resulting in poor adsorption performance of C3H6. Furthermore, traditional separation methods are energy-intensive and it is difficult to improve the separation selectivity and flux of C3H6/C3H8 without changing the membrane network structure.

⚗Method used

Organosilicon sol was prepared by reacting an organosilicon precursor with MOF-74 material under continuous water bath stirring. The MOF-74/biphenyl bridge organosilicon hybrid sol was then coated onto a porous α-alumina tube and calcined to form a MOF-74/biphenyl bridge organosilicon hybrid membrane. The pore structure was optimized to improve separation performance.

🎯Benefits of technology

Without altering the original membrane network structure, the MOF-74/biphenyl bridged organosilicon hybrid membrane improves the separation selectivity and flux of C3H6/C3H8, achieving a more efficient gas separation effect.

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Abstract

The application discloses a MOF-74 / diphenyl bridged organosilicon hybrid membrane and a preparation method and application thereof, wherein a hydrocarbon functionalized organosilicon substance BTESBPh with a rigid benzene ring structure is selected as a precursor, and MOF-74 material with a high specific surface area and specific adsorption to C3H6 gas is doped into the precursor, the pore structure of the membrane is optimized, the prepared MOF-74 / diphenyl bridged organosilicon hybrid membrane has a looser network structure, the flux of the membrane and the C3H6 / C3H8 separation selectivity can be improved without changing the original membrane network structure, the composite ratio is optimized, the composite membrane material with the best separation performance is obtained, and the application prospect is wide.
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