Coordination enhancement of hydrogen and helium recovery in polybenzimidazole-based carbon molecular sieve membranes

被引：26

作者：

Jiao, Yang ^{[1
,2
,3
]}

Wu, Qi ^{[1
,2
,3
]}

Xu, Wei ^{[4
]}

Lai, Wei ^{[3
]}

Xiao, Luqi ^{[3
]}

Mei, Xue ^{[5
]}

Zhang, Hongjun ^{[4
]}

Luo, Shuangjiang ^{[3
,5
]}

机构：

[1] Univ Sci & Technol China, Sch Rare Earths, Hefei 230026, Peoples R China

[2] Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341119, Peoples R China

[3] Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, State Key Lab Multiphase Complex Syst,Beijing Key, Beijing 100190, Peoples R China

[4] Univ Sci & Technol China, State Key Lab Particle Detect & Elect, Hefei 230026, Peoples R China

[5] Shanxi Zheda Inst Adv Mat & Chem Engn, Taiyuan 030000, Shanxi, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2023年 / 315卷

基金：

中国国家自然科学基金;

关键词：

Carbon molecular sieve membrane; Polybenzimidazole; Triptycene; Rare earth; Coordination; TRANSPORT-PROPERTIES; POLYMERS; TEMPERATURE; POLYIMIDES;

D O I：

10.1016/j.seppur.2023.123691

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Tailoring the microporous architecture of the precursors facilitates the gas separation performance in carbon molecular sieve (CMS) membranes. Herein, we report a facile strategy to tune the gas separation performance of CMS membranes through coordination between rare earth and imidazoles in the hierarchical triptycene-based polybenzimidazole (TPBI) precursor. By optimizing the pyrolysis condition and rare earth doping level, the resulting CMS membranes exhibited unprecedented H2 and He permeabilities and high gas selectivities, and the TPBI-Yb0.67@700 CMS membrane exhibited a 3-fold increase in H2 permeability and a 2-fold increase in H2/CO2 selectivity compared to the TPBI-CMS@700 CMS membrane. It was demonstrated by the solution/diffusion coefficients and microporosity analysis that the enhancement of gas separation performance originated from the more pronounced hierarchically slit-like micropore structure, as well as the boosted diffusion and sorption se-lectivities. The TPBI-Yb0.67@700 membrane displayed a H2 permeability of 8648 Barrer and a mixed-gas H2/CO2 selectivity of 14.5 at 150 degrees C, far exceeding the experimental CMS upper bound.

引用

页数：9