RT Journal Article
T1 PBI mixed matrix hollow fiber membrane: Influence of ZIF-8 filler over H2/CO2 separation performance at high temperature and pressure: 												Influence of ZIF-8 filler over H2/CO2 separation performance at high temperature and pressure
A1 Etxeberria-Benavides, Miren
A1 Johnson, Timothy
A1 Cao, Shuai
A1 Zornoza, Beatriz
A1 Coronas, Joaquín
A1 Sanchez-Lainez, Javier
A1 Sabetghadam, Anahid
A1 Liu, Xinlei
A1 Andres-Garcia, Eduardo
A1 Kapteijn, Freek
A1 Gascon, Jorge
A1 David, Oana
AB High performance and commercially attractive mixed-matrix membranes were developed for H2/CO2 separation via a scalable hollow fiber spinning process. Thin (~300 nm) and defect-free selective layers were successfully created with a uniform distribution of the nanosized (~60 nm) zeolitic-imidazole framework (ZIF-8) filler within the polymer (polybenzimidazole, PBI) matrix. These membranes were able to operate at high temperature (150 °C) and pressure (up to 30 bar) process conditions required in treatment of pre-combustion and syngas process gas streams. Compared with neat PBI hollow fibers, filler incorporation into the polymer matrix leads to a strong increase in H2 permeance from 65 GPU to 107 GPU at 150 °C and 7 bar, while the ideal H2/CO2 selectivity remained constant at 18. For mixed gas permeation, there is competition between H2 and CO2 transport inside ZIF-8 structure. Adsorption of CO2 in the nanocavities of the filler suppresses the transport of the faster permeating H2 and consequently decreases the H2 permeance with total feed pressure down to values equal to the pure PBI hollow fibers for the end pressure of 30 bar. Therefore, the improvement of fiber performance for gas separation with filler addition is compromised at high operating feed pressures, which emphasizes the importance of membrane evaluation under relevant process conditions.
SN 1383-5866
YR 2020
FD 2020-04-15
LA eng
NO Etxeberria-Benavides , M , Johnson , T , Cao , S , Zornoza , B , Coronas , J , Sanchez-Lainez , J , Sabetghadam , A , Liu , X , Andres-Garcia , E , Kapteijn , F , Gascon , J & David , O 2020 , ' PBI mixed matrix hollow fiber membrane: Influence of ZIF-8 filler over H2/CO2 separation performance at high temperature and pressure : Influence of ZIF-8 filler over H 2 /CO 2 separation performance at high temperature and pressure ' , Separation and Purification Technology , vol. 237 , 116347 , pp. 116347 . https://doi.org/10.1016/j.seppur.2019.116347
NO Publisher Copyright: © 2019 The Authors
DS TECNALIA Publications
RD 1 sept 2024