Abstract
The preparation and performance of mixed matrix membranes (MMMs) based on polybenzimidazole (PBI) and ZIF-8 nanoparticles of different average sizes (50, 70 and 150 nm) as filler are reported. MMMs containing 10 and 20 wt% of ZIF-8 were tested for H2/CO2 separation (pre-combustion CO2 capture) at 150 °C and feed pressures from 3 to 6 bar. The addition of ZIF-8 resulted in a clear improvement in membrane performance. Embedding 20 wt% of ZIF-8 resulted in a H2 permeability increase of six times and the H2/CO2 selectivity increased nearly by 55% compared to the bare PBI polymer membrane. Both permeability and selectivity improved as the filler size increased, due to the lower degree of agglomeration of the largest particles, that may be less active owing to their smaller external surface area. MMMs synthesized using dry 150 nm ZIF-8 filler showed a better performance than those containing wet filler. Apart from agglomeration concerns favoring wet filler handling as evidenced by infrared characterization, the MMM preparation with wet filler is simpler than with dry filler. Finally, the reproducibility of the membranes was confirmed by a European interlaboratory Round Robin test involving three different institutions.
Original language | English (US) |
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Pages (from-to) | 45-53 |
Number of pages | 9 |
Journal | Journal of Membrane Science |
Volume | 515 |
DOIs | |
State | Published - Oct 1 2016 |
Externally published | Yes |
Bibliographical note
Funding Information:Financial support from the Spanish MINECO ( MAT2013-40556-R ), the Aragón Government (T05) and the ESF is gratefully acknowledged. The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007–2013) under Grant Agreement no. 608490 , project M4CO2. All the microscopy work was done in the Laboratorio de Microscopías Avanzadas at the Instituto de Nanociencia de Aragón (LMA-INA). The use of the Servicio General de Apoyo a la Investigación-SAI (Universidad de Zaragoza) is acknowledged. J.G. and B.S. gratefully acknowledge financial support from the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013)/ERC Grant Agreement no. 335746 , CrystEng-MOF-MMM.
Publisher Copyright:
© 2016 Elsevier B.V.
Keywords
- Interlaboratory test
- Mixed matrix membrane
- Polybenzimidazole (PBI)
- Pre-combustion CO capture
- ZIF-8
ASJC Scopus subject areas
- Biochemistry
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation