Abstract
Carbon capture and storage (CCS) using membranes for the separation of CO2 holds great promise for the reduction of atmospheric CO2 emissions from fuel combustion and industrial processes. Among the different process outlines, post-combustion CO2 capture could be easily implemented in existing power plants. However, for this technology to become viable, new membrane materials have to be developed. In this article we present the development of high performance mixed matrix membranes (MMMs) composed of ZIF-94 filler and 6FDA-DAM polymer matrix. The CO2/N2 separation performance was evaluated by mixed gas tests (15CO2:85N2) at 25 °C and 1–4 bar transmembrane pressure difference. The CO2 membrane permeability was increased by the addition of the ZIF-94 particles, maintaining a constant CO2/N2 selectivity of ~22. The largest increase in CO2 permeability of ~ 200% was observed for 40 wt% ZIF-94 loading, reaching the highest permeability (2310 Barrer) at similar selectivity among 6FDA-DAM MMMs reported in literature. For the first time, the ZIF-94 metal organic framework crystals with particle size smaller than 500 nm were synthesized using nonhazardous solvent (tetrahydrofuran and methanol) instead of dimethylformamide (DMF) in a scalable process. Membranes were characterized by three non-invasive image techniques, i.e. SEM, AFM and nanoscale infrared imaging by scattering-type scanning near-field optical microscopy (s-SNOM). The combination of these techniques demonstrates a very good dispersion and interaction of the filler in the polymer layer, even at very high loadings.
Original language | English (US) |
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Pages (from-to) | 198-207 |
Number of pages | 10 |
Journal | Journal of Membrane Science |
Volume | 550 |
DOIs | |
State | Published - Mar 15 2018 |
Bibliographical note
Funding Information:The authors acknowledge the financial support of the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013) , under grant agreement no. 608490 , M4CO2 project, and the Spanish Ministry of Economy and Competitiveness (national project MAT2015-65525-R ). The authors are very grateful to Gorka Imbuluzqueta (Tecnalia Research and Innovation, Spain) for the IR characterization of the samples. J.G. gratefully acknowledges support from the European Union Seventh Framework Programme (FP7/2007–2013) , ERC Stg, Grant Agreement n. 335746 , CrystEng-MOF-MMM.
Funding Information:
The authors acknowledge the financial support of the European Research Council under the European Union's Seventh Framework Programme (FP/2007–2013), under grant agreement no. 608490, M4CO2 project, and the Spanish Ministry of Economy and Competitiveness (national project MAT2015-65525-R). The authors are very grateful to Gorka Imbuluzqueta (Tecnalia Research and Innovation, Spain) for the IR characterization of the samples. J.G. gratefully acknowledges support from the European Union Seventh Framework Programme (FP7/2007–2013), ERC Stg, Grant Agreement n. 335746, CrystEng-MOF-MMM.
Publisher Copyright:
© 2017 The Authors
Keywords
- CO capture
- Metal organic frameworks
- Mixed matrix membrane
- ZIF-94
ASJC Scopus subject areas
- Biochemistry
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation