Metallocene-anchor inducing oriented MOF membrane for helium separation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41145524.
- Also identified by DOI 10.1038/s41467-025-64533-5 and PMC identifier 12559419.
- Licence recorded as CC BY-NC-ND.
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Abstract
Oriented metal-organic framework (MOF) membranes hold significant promise for advanced helium (He) separation, but their synthesis remains a challenging task. We report the preparation of an oriented MOF membrane using metal-organic polyhedra (MOP) fragment as metallocene-anchor. The metallocene-anchor induces the growth of homoligand Zr-MOF along the c-axis, resulting in the {001}-oriented structure. This orientation increases the transition energy barrier of methane (CH<sub>4</sub>), enabling precise He/CH<sub>4</sub> separation with a selectivity of 77.3 and a He permeance of 695.1 GPU. The membrane exhibits exceptional robustness, demonstrating resistance to high-pressure conditions (up to 40 bar), thermal shock (-25 °C to 85 °C), and long-term stability (1000 h). The separation performance surpasses that of existing MOF membranes and exceeds the Robeson upper bound. Additionally, a three-stage membrane process enables the concentration of low He concentrations of 0.3% up to 99.9%, highlighting the potential of membranes for helium extraction. The successful fabrication of various oriented MOF membranes indicates the universality of this strategy.