Details
| Original language | English |
|---|---|
| Pages (from-to) | 181-186 |
| Number of pages | 6 |
| Journal | Journal of membrane science |
| Volume | 492 |
| Early online date | 8 May 2015 |
| Publication status | Published - 15 Oct 2015 |
Abstract
In this paper the separation of the binary mixture H2/CH4 on (i) neat supported ZIF (zeolitic imidazolate framework) membranes of types ZIF-8 and ZIF-90, (ii) a neat supported Matrimid polymer membrane, and (iii) Mixed Matrix Membranes (MMMs) with 10, 20 and 30vol-% ZIF-8 and ZIF-90 nanocrystals in Matrimid is compared. A high separation performance was found surprisingly for the MMMs and it was concluded that the polymer matrix prevents the framework flexibility of the embedded Metal Organic Framework (MOF) particles, thus increasing the selectivity of MMMs with particle loadings ≤20vol-%. Higher loadings, however, lead to agglomerations and segregations, which result in MMMs with lower selectivities. To approve the idea of the hindered linker distortion caused by the surrounding polymer, we coated the top of neat supported ZIF-8 and neat ZIF-90 membranes with an additional Matrimid polymer layer (dual-layer membrane). Indeed, the polymer coating also caused a suppression of the linker distortion of the ZIF layer in contact with the polymer which results in an enhanced H2/CH4 selectivity.
Keywords
- Breathing, Framework flexibility, Gate opening effect, Mixed Matrix Membrane, Zeolitic imidazolate framework
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- General Materials Science
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 492, 15.10.2015, p. 181-186.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - MOF based MMMs with enhanced selectivity due to hindered linker distortion
AU - Diestel, Lisa
AU - Wang, Nanyi
AU - Schwiedland, Bärbel
AU - Steinbach, Frank
AU - Giese, Ulrich
AU - Caro, Jürgen
N1 - Funding Information: This work was financed by DFG in the frame of Priority Program 1362 (Porous Metal–Organic Frameworks), organized by S. Kaskel (Dresden). Prof. Dr. A. Feldhoff (Leibniz University of Hannover) is thanked for stimulating discussions.
PY - 2015/10/15
Y1 - 2015/10/15
N2 - In this paper the separation of the binary mixture H2/CH4 on (i) neat supported ZIF (zeolitic imidazolate framework) membranes of types ZIF-8 and ZIF-90, (ii) a neat supported Matrimid polymer membrane, and (iii) Mixed Matrix Membranes (MMMs) with 10, 20 and 30vol-% ZIF-8 and ZIF-90 nanocrystals in Matrimid is compared. A high separation performance was found surprisingly for the MMMs and it was concluded that the polymer matrix prevents the framework flexibility of the embedded Metal Organic Framework (MOF) particles, thus increasing the selectivity of MMMs with particle loadings ≤20vol-%. Higher loadings, however, lead to agglomerations and segregations, which result in MMMs with lower selectivities. To approve the idea of the hindered linker distortion caused by the surrounding polymer, we coated the top of neat supported ZIF-8 and neat ZIF-90 membranes with an additional Matrimid polymer layer (dual-layer membrane). Indeed, the polymer coating also caused a suppression of the linker distortion of the ZIF layer in contact with the polymer which results in an enhanced H2/CH4 selectivity.
AB - In this paper the separation of the binary mixture H2/CH4 on (i) neat supported ZIF (zeolitic imidazolate framework) membranes of types ZIF-8 and ZIF-90, (ii) a neat supported Matrimid polymer membrane, and (iii) Mixed Matrix Membranes (MMMs) with 10, 20 and 30vol-% ZIF-8 and ZIF-90 nanocrystals in Matrimid is compared. A high separation performance was found surprisingly for the MMMs and it was concluded that the polymer matrix prevents the framework flexibility of the embedded Metal Organic Framework (MOF) particles, thus increasing the selectivity of MMMs with particle loadings ≤20vol-%. Higher loadings, however, lead to agglomerations and segregations, which result in MMMs with lower selectivities. To approve the idea of the hindered linker distortion caused by the surrounding polymer, we coated the top of neat supported ZIF-8 and neat ZIF-90 membranes with an additional Matrimid polymer layer (dual-layer membrane). Indeed, the polymer coating also caused a suppression of the linker distortion of the ZIF layer in contact with the polymer which results in an enhanced H2/CH4 selectivity.
KW - Breathing
KW - Framework flexibility
KW - Gate opening effect
KW - Mixed Matrix Membrane
KW - Zeolitic imidazolate framework
UR - http://www.scopus.com/inward/record.url?scp=84934927064&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2015.04.069
DO - 10.1016/j.memsci.2015.04.069
M3 - Article
AN - SCOPUS:84934927064
VL - 492
SP - 181
EP - 186
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
ER -