Ru@MOF-808 / PVDF composite membrane, preparation method and application thereof

By preparing Ru@MOF-808/PVDF composite membranes, the problem of performance degradation of Ru@MOF-808 catalysts during long-term cyclic use was solved, achieving high efficiency and selectivity in photocatalytic carbon dioxide reduction to methane, which is suitable for large-scale industrial production.

CN122098705APending Publication Date: 2026-05-29SUN YAT SEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUN YAT SEN UNIV
Filing Date
2026-02-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The existing Ru@MOF-808 catalyst exhibits significantly reduced catalytic performance and methane selectivity after long-term and repeated use, limiting its application in large-scale, industrial production.

Method used

A Ru@MOF-808/PVDF composite membrane was prepared by mixing Ru@MOF-808 with polyvinylidene fluoride resin and then using coating, wetting, immersion and gradient drying methods to form a porous composite membrane, which avoids catalyst agglomeration and improves catalytic performance and methane selectivity.

Benefits of technology

The Ru@MOF-808/PVDF composite membrane maintains excellent catalytic performance and methane selectivity even after multiple cycles of use, solving the performance degradation problem of powdered catalysts and making it suitable for photocatalytic carbon dioxide reduction to methane.

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Abstract

The application discloses a Ru@MOF-808 / PVDF composite film and a preparation method and application thereof. The preparation method comprises the following steps: S1. mixing components including Ru@MOF-808, an organic solvent and polyvinylidene fluoride resin to obtain casting solution; S2. coating the casting solution in step S1 on the surface of a substrate to obtain a film-substrate; then wetting the film of the film-substrate by water, and then soaking the wet film-substrate in water to remove the film, thereby obtaining a precursor film; then gradient drying the precursor film to obtain the Ru@MOF-808 / PVDF composite film; and the gradient drying process in step S2 is: first, keeping at 35-45 DEG C for 4-6 h, and then, increasing the temperature to 55-65 DEG C and keeping for 4-6 h. When the Ru@MOF-808 / PVDF composite film is applied to photocatalytic reduction of carbon dioxide to prepare methane, the Ru@MOF-808 / PVDF composite film not only has excellent catalytic performance and methane selectivity, but also can still maintain high catalytic performance and methane selectivity after long-time and multiple cycle use.
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