Zeolitic imidazolate framework ZIF-7 based molecular sieve membrane for hydrogen separation
- authored by
- Yanshuo Li, Fangyi Liang, Helge Bux, Weishen Yang, Jürgen Caro
- 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.
- Organisation(s)
-
Institute of Physical Chemistry and Electrochemistry
- External Organisation(s)
-
CAS - Dalian Institute of Chemical Physics
- Type
- Article
- Journal
- Journal of membrane science
- Volume
- 354
- Pages
- 48-54
- No. of pages
- 7
- ISSN
- 0376-7388
- Publication date
- 15.05.2010
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Biochemistry, General Materials Science, Physical and Theoretical Chemistry, Filtration and Separation
- Sustainable Development Goals
- SDG 7 - Affordable and Clean Energy, SDG 13 - Climate Action
- Electronic version(s)
-
https://doi.org/10.1016/j.memsci.2010.02.074 (Access:
Closed)
