Preparation method and application of oriented bidentate zeolitic imidazolate framework membrane
By introducing benzimidazole ligands and optimizing reactant concentrations, a highly (011) oriented cobalt-based zeolite imidazole ester framework membrane was prepared under the action of a magnetic field, which solved the problem of low CO2/CH4 separation performance of ZIF-67 membrane and achieved high-efficiency gas separation performance and industrial applicability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEBEI UNIV OF TECH
- Filing Date
- 2026-06-09
- Publication Date
- 2026-07-17
AI Technical Summary
The existing ZIF-67 membrane has low CO2/CH4 separation performance. Traditional MOF membranes have mismatched pore sizes, and the lattice flexibility leads to low separation selectivity. In addition, the high concentration of reactants during the preparation process leads to random crystal orientation, which affects the separation performance.
A dual-ligand strategy was adopted, benzimidazole ligands were introduced, reactant concentrations were optimized, and nucleation time was extended under the action of a magnetic field to prepare a highly (011) oriented cobalt-based zeolite imidazole ester framework membrane. The selective induction effect of the magnetic field and the ligand size effect were used to suppress lattice flexibility and optimize sieving pore size and gas adsorption behavior.
It improves the separation performance of CO2/CH4, with an ideal separation factor of over 25. The membrane layer is dense and defect-free, making it suitable for industrial production and environmentally friendly.
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Figure CN122399583A_ABST