膜
渗透
选择性
配体(生物化学)
氧气
化学
气体分离
相(物质)
空气分离
分析化学(期刊)
分子
巴(单位)
化学工程
气相
材料科学
色谱法
有机化学
受体
催化作用
热力学
工程类
气象学
物理
生物化学
作者
Kiwon Eum,Masataro Hayashi,Matheus Dorneles de Mello,Feng Xue,Hyuk Taek Kwon,Michael Tsapatsis
标识
DOI:10.1002/anie.201909490
摘要
Abstract Vapor phase ligand treatment (VPLT) of 2‐aminobenzimidazole (2abIm) for 2‐methylimidazole (2mIm) in ZIF‐8 membranes prepared by two different methods (LIPS: ligand induced permselectivation and RTD: rapid thermal deposition) results in a notable shift of the molecular level cut‐off to smaller molecules establishing selectivity improvements from ca. 1.8 to 5 for O 2 /N 2 ; 2.2 to 32 for CO 2 /CH 4 ; 2.4 to 24 for CO 2 /N 2 ; 4.8 to 140 for H 2 /CH 4 and 5.2 to 126 for H 2 /N 2 . Stable (based on a one‐week test) oxygen‐selective air separation performance at ambient temperature, 7 bar(a) feed, and 1 bar(a) sweep‐free permeate with a mixture separation factor of 4.5 and oxygen flux of 2.6×10 −3 mol m −2 s −1 is established. LIPS and RTD membranes exhibit fast and gradual evolution upon a 2abIm‐VPLT, respectively, reflecting differences in their thickness and microstructure. Functional reversibility is demonstrated by showing that the original permeation properties of the VPLT‐LIPS membranes can be recovered upon 2mIm‐VPLT.
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