Details
| Original language | English |
|---|---|
| Pages (from-to) | 48-54 |
| Number of pages | 7 |
| Journal | Journal of membrane science |
| Volume | 354 |
| Issue number | 1-2 |
| Early online date | 6 Mar 2010 |
| Publication status | Published - 15 May 2010 |
Abstract
Hydrogen-based energy system could address issues related to global climate change, energy security, and local air pollution. Thermally and hydrothermally stable microporous membranes with intrinsic high H2/CO2 selectivity are highly demanded. A novel zeolitic imidazolate framework (ZIF-7) membrane was tested for its gas separation performance. ZIFs are microporous materials and belong to the new class of metal-organic frameworks (MOFs). ZIF-7 is formed by bridging benzimidazolate anions and zinc cations resulting in a sodalite (SOD) topology with a pore size of about 0.3 nm. The ZIF-7 membrane exhibited promising H2 separation abilities. At 220 °C, the H2 permeance is ∼4.5 × 10-8 mol m-2 s-1 Pa-1 and the mixture separation factors for H2/CO2, H2/N2, and H2/CH4 are 13.6, 18.0, and 14.0, respectively. As a result of molecular sieving mechanism, the ideal selectivities and mixture separation factors are identical. The permeation of H2 through the ZIF-7 membrane is highly activated with an apparent activation energy of 11.9 kJ mol-1. Due to the ultra-hydrophobic properties of ZIF materials, the ZIF-7 membrane also showed excellent hydrothermal stability in the presence of steam. Our results clearly demonstrate that ZIF-7 membranes have an intrinsic high H2/CO2 selectivity and a promising application in hydrogen separation, which is based on its very narrow and well-defined crystal pore structure.
Keywords
- Gas separation, Metal-organic frameworks, Molecular sieve membranes, Zeolitic imidazolate frameworks, ZIF-7
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
Sustainable Development Goals
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In: Journal of membrane science, Vol. 354, No. 1-2, 15.05.2010, p. 48-54.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Zeolitic imidazolate framework ZIF-7 based molecular sieve membrane for hydrogen separation
AU - Li, Yanshuo
AU - Liang, Fangyi
AU - Bux, Helge
AU - Yang, Weishen
AU - Caro, Jürgen
PY - 2010/5/15
Y1 - 2010/5/15
N2 - Hydrogen-based energy system could address issues related to global climate change, energy security, and local air pollution. Thermally and hydrothermally stable microporous membranes with intrinsic high H2/CO2 selectivity are highly demanded. A novel zeolitic imidazolate framework (ZIF-7) membrane was tested for its gas separation performance. ZIFs are microporous materials and belong to the new class of metal-organic frameworks (MOFs). ZIF-7 is formed by bridging benzimidazolate anions and zinc cations resulting in a sodalite (SOD) topology with a pore size of about 0.3 nm. The ZIF-7 membrane exhibited promising H2 separation abilities. At 220 °C, the H2 permeance is ∼4.5 × 10-8 mol m-2 s-1 Pa-1 and the mixture separation factors for H2/CO2, H2/N2, and H2/CH4 are 13.6, 18.0, and 14.0, respectively. As a result of molecular sieving mechanism, the ideal selectivities and mixture separation factors are identical. The permeation of H2 through the ZIF-7 membrane is highly activated with an apparent activation energy of 11.9 kJ mol-1. Due to the ultra-hydrophobic properties of ZIF materials, the ZIF-7 membrane also showed excellent hydrothermal stability in the presence of steam. Our results clearly demonstrate that ZIF-7 membranes have an intrinsic high H2/CO2 selectivity and a promising application in hydrogen separation, which is based on its very narrow and well-defined crystal pore structure.
AB - Hydrogen-based energy system could address issues related to global climate change, energy security, and local air pollution. Thermally and hydrothermally stable microporous membranes with intrinsic high H2/CO2 selectivity are highly demanded. A novel zeolitic imidazolate framework (ZIF-7) membrane was tested for its gas separation performance. ZIFs are microporous materials and belong to the new class of metal-organic frameworks (MOFs). ZIF-7 is formed by bridging benzimidazolate anions and zinc cations resulting in a sodalite (SOD) topology with a pore size of about 0.3 nm. The ZIF-7 membrane exhibited promising H2 separation abilities. At 220 °C, the H2 permeance is ∼4.5 × 10-8 mol m-2 s-1 Pa-1 and the mixture separation factors for H2/CO2, H2/N2, and H2/CH4 are 13.6, 18.0, and 14.0, respectively. As a result of molecular sieving mechanism, the ideal selectivities and mixture separation factors are identical. The permeation of H2 through the ZIF-7 membrane is highly activated with an apparent activation energy of 11.9 kJ mol-1. Due to the ultra-hydrophobic properties of ZIF materials, the ZIF-7 membrane also showed excellent hydrothermal stability in the presence of steam. Our results clearly demonstrate that ZIF-7 membranes have an intrinsic high H2/CO2 selectivity and a promising application in hydrogen separation, which is based on its very narrow and well-defined crystal pore structure.
KW - Gas separation
KW - Metal-organic frameworks
KW - Molecular sieve membranes
KW - Zeolitic imidazolate frameworks
KW - ZIF-7
UR - http://www.scopus.com/inward/record.url?scp=77950367754&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2010.02.074
DO - 10.1016/j.memsci.2010.02.074
M3 - Article
AN - SCOPUS:77950367754
VL - 354
SP - 48
EP - 54
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
IS - 1-2
ER -