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Published on: February 22, 2020
A Sacrificial Seed Layer Strategy for Hierarchical MFI Zeolite Membranes With Enhanced Butane Isomer Separation
Jun Li1, Xingtong Yu1, Xiaofei Lu2
1Key Laboratory of Biomass Chemical Engineering of Ministry of Education, ERC of Membrane and Water Treatment (MOE), College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China.
Angewandte Chemie (International Ed. in English)
|July 3, 2026
Summary
A new sacrificial seed layer strategy enables the fabrication of hierarchical MFI zeolite membranes (HMFI). This breakthrough enhances both selectivity and permeance for crucial gas separations like n-butane and isobutane.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Zeolite membranes are crucial for gas separations, but achieving high permeance and selectivity simultaneously is difficult.
- Fabricating thin, selective zeolite layers with high precision remains a significant obstacle in membrane technology.
Purpose of the Study:
- To develop a novel fabrication strategy for hierarchical MFI zeolite membranes (HMFI) on α-Al2O3 tubes.
- To overcome the limitations of conventional methods in balancing permeance and selectivity for gas separation.
Main Methods:
- Utilized a sacrificial seed layer strategy during the synthesis of MFI zeolite membranes.
- Precisely controlled ionic interactions and nutrient supply to modulate seed layer function as a porogen and promoter.
- Fabricated hierarchical MFI zeolite membranes on commercial α-Al2O3 tubular supports.
Main Results:
- Achieved over a fourfold increase in ideal n-butane/isobutane selectivity and a 37% rise in n-butane permeance compared to conventional MFI membranes.
- Demonstrated an excellent separation factor of 158 for a 10/90 n-/i-butane mixture with high n-butane permeance.
- Reported the highest performance for zeolite membranes on tubular supports for n-/i-butane separation.
Conclusions:
- The sacrificial seed layer strategy offers a novel route to high-performance zeolite membranes.
- This approach provides new avenues for microstructural engineering in zeolite membrane fabrication.
- The developed HMFI membranes significantly advance gas separation technology, particularly for hydrocarbon separations.
