A LDH Template Triggers the Formation of a Highly Compact MIL‐53 Metal‐Organic Framework Membrane for Acid Upgrading

Highly compact metal–organic framework (MOF) membranes offer hope for the ambition to cope with challenging separation scenarios with industrial implications. A continuous layer of layered double hydroxide (LDH) nanoflakes on an alumina support as a template triggered a chemical self‐conversion to a...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-04, Vol.62 (16), p.e202302181-n/a
Main Authors: Wang, Yuecheng, Ban, Yujie, Hu, Ziyi, Yang, Weishen
Format: Article
Language:English
Subjects:
Acetic acid
Acid Upgrading
Aluminum oxide
Dewatering
Distillation
Energy consumption
Formic acid
Hydroxides
Membranes
Metal-organic frameworks
Nutrient availability
Nutrients
Orthorhombic lattice
Pervaporation
Separation
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Summary:Highly compact metal–organic framework (MOF) membranes offer hope for the ambition to cope with challenging separation scenarios with industrial implications. A continuous layer of layered double hydroxide (LDH) nanoflakes on an alumina support as a template triggered a chemical self‐conversion to a MIL‐53 membrane, with approximately 8 hexagonal lattices (LDH) traded for 1 orthorhombic lattice (MIL‐53). With the sacrifice of the template, the availability of Al nutrients from the alumina support was dynamically regulated, which resulted in synergy for producing membranes with highly compact architecture. The membrane can realize nearly complete dewatering from formic acid and acetic acid solutions, respectively, and maintain stability in a continuous pervaporation over 200 h. This is the first success in directly applying a pure MOF membrane to such a corrosive chemical environment (lowest pH value of 0.81). The energy consumption is saved by up to 77 % when compared with the traditional distillation. A LDH nanoflake template layer triggers conversion into a highly compact MIL‐53 membrane. The template guides MIL‐53 crystals to replicate its imprint out‐of‐plane and modulates the availability of Al from the alumina support for in‐plane growth of MIL‐53. The membrane can achieve complete dewatering from azeotropic formic acid and save 77 % of the energy consumption compared to distillation.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202302181