Hetero‐Lattice Intergrown and Robust MOF Membranes for Polyol Upgrading. (12th January 2022)

• Record Type: Journal Article
• Authors: Wang, Yuecheng; Ban, Yujie; Hu, Ziyi; Zhao, Yang; Zheng, Mingyuan; Yang, Weishen; Zhang, Tao
• Is Part Of: Angewandte Chemie. Volume 134:Number 10(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-12
• Subjects: Membranes -- Metal-Organic Frameworks -- Pervaporation -- Polyol -- Separation; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202114479
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Metal–organic framework membranes are frequently used in gas separations, but rare in pervaporation for liquid chemical upgrading, especially for separating water from polyols, due to lack of highly compact and robust micro‐architecture. Here, we report hetero‐lattice intergrown membranes in which amino ‐MIL‐101 (Cr) particles embedded into the micro‐gaps of MIL‐53 (Al) rod arrays after secondary growth. By means of high‐resolution TEM and two‐dimensional topologic simulation, the connection between these two distinct MOF lattices at the molecular‐level and their crystallographic geometry harmony is identified, which leads to a close‐knit structure at the crystal boundaries of membranes. Typically, the membrane shows a separation factor as high as 13 000 for a 90/10 ethanediol/water solution in pervaporation, yields polymer‐grade ethanediol, and saves ca. 32 % of energy consumption vs. vacuum distillation. It has a highly robust micro‐architecture, with great tolerance to high pressure, durability against ultrasonic therapy and long‐term separation stability over 600 h. Abstract : Hetero‐lattice intergrown (HIL) MOF membranes were synthesized, with an integration of two distinct network MOFs, namely MIL‐53 (Al) and amino ‐MIL‐101 (Cr), at the molecular scale. The complementary growth, concomitant with a close connection between two lattices, creates a highly compact and robust micro‐architecture. The HLI MOF membrane displays excellent pervaporation dehydration performances for aqueous polyol solutions, and can deal with tough separation situations.