Details
| Original language | English |
|---|---|
| Pages (from-to) | 68-74 |
| Number of pages | 7 |
| Journal | Separation and Purification Technology |
| Volume | 146 |
| Early online date | 26 Mar 2015 |
| Publication status | Published - 26 May 2015 |
Abstract
Highly hydrogen-permselective zeolitic imidazolate framework ZIF-8 membranes are prepared on coarse and macroporous Al2O3 tubes through a repeated synthesis strategy for the separation of H2/CO2, H2/CH4, and H2/C3H8 mixtures. Since the amino-groups of 3-aminopropyltriethoxysilane (APTES) can coordinate to the free Zn2+ centers and thus bind the growing nano-crystals directly, the nucleation and growth of well intergrown ZIF-8 membranes could be promoted through a repeated synthesis of the ZIF-8 layer on APTES-modified macroporous Al2O3 tubes. The SEM and XRD characterizations indicate that a dense and phase-pure ZIF-8 membrane with a thickness of about 25.0 μm can be formed on the alumina tubes by microwave synthesis at 105 °C for 3 h, and no cracks, pinholes or other defects were observed in the membrane layer. The ZIF-8 membranes were evaluated in single gas permeation and mixed gas separation. Attributed to the preferential adsorption affinity and capacity as well as a highly porous structure with nano-sized channels, the ZIF-8 membrane displays a high hydrogen permselectivity. For the separation of equimolar H2/CO2, H2/CH4, H2/C3H8 mixtures at 100 °C and 2 bar, the mixture separation factors of H2/CO2, H2/CH4, and H2/C3H8 are 5.6, 44.0, 328.6, with a H2 permeance of about 1.1 × 10-7 mol m-2 s-1 Pa-1, which is promising for potential applications in hydrogen purification and separation.
Keywords
- Chemical modification, Hydrogen separation, Metal-organic frameworks (MOFs), Microwave synthesis, ZIF-8 membranes
ASJC Scopus subject areas
- Chemistry(all)
- Analytical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Separation and Purification Technology, Vol. 146, 26.05.2015, p. 68-74.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Highly hydrogen-permselective zeolitic imidazolate framework ZIF-8 membranes prepared on coarse and macroporous tubes through repeated synthesis
AU - Zhu, Yaqiong
AU - Liu, Qian
AU - Caro, Jürgen
AU - Huang, Aisheng
PY - 2015/5/26
Y1 - 2015/5/26
N2 - Highly hydrogen-permselective zeolitic imidazolate framework ZIF-8 membranes are prepared on coarse and macroporous Al2O3 tubes through a repeated synthesis strategy for the separation of H2/CO2, H2/CH4, and H2/C3H8 mixtures. Since the amino-groups of 3-aminopropyltriethoxysilane (APTES) can coordinate to the free Zn2+ centers and thus bind the growing nano-crystals directly, the nucleation and growth of well intergrown ZIF-8 membranes could be promoted through a repeated synthesis of the ZIF-8 layer on APTES-modified macroporous Al2O3 tubes. The SEM and XRD characterizations indicate that a dense and phase-pure ZIF-8 membrane with a thickness of about 25.0 μm can be formed on the alumina tubes by microwave synthesis at 105 °C for 3 h, and no cracks, pinholes or other defects were observed in the membrane layer. The ZIF-8 membranes were evaluated in single gas permeation and mixed gas separation. Attributed to the preferential adsorption affinity and capacity as well as a highly porous structure with nano-sized channels, the ZIF-8 membrane displays a high hydrogen permselectivity. For the separation of equimolar H2/CO2, H2/CH4, H2/C3H8 mixtures at 100 °C and 2 bar, the mixture separation factors of H2/CO2, H2/CH4, and H2/C3H8 are 5.6, 44.0, 328.6, with a H2 permeance of about 1.1 × 10-7 mol m-2 s-1 Pa-1, which is promising for potential applications in hydrogen purification and separation.
AB - Highly hydrogen-permselective zeolitic imidazolate framework ZIF-8 membranes are prepared on coarse and macroporous Al2O3 tubes through a repeated synthesis strategy for the separation of H2/CO2, H2/CH4, and H2/C3H8 mixtures. Since the amino-groups of 3-aminopropyltriethoxysilane (APTES) can coordinate to the free Zn2+ centers and thus bind the growing nano-crystals directly, the nucleation and growth of well intergrown ZIF-8 membranes could be promoted through a repeated synthesis of the ZIF-8 layer on APTES-modified macroporous Al2O3 tubes. The SEM and XRD characterizations indicate that a dense and phase-pure ZIF-8 membrane with a thickness of about 25.0 μm can be formed on the alumina tubes by microwave synthesis at 105 °C for 3 h, and no cracks, pinholes or other defects were observed in the membrane layer. The ZIF-8 membranes were evaluated in single gas permeation and mixed gas separation. Attributed to the preferential adsorption affinity and capacity as well as a highly porous structure with nano-sized channels, the ZIF-8 membrane displays a high hydrogen permselectivity. For the separation of equimolar H2/CO2, H2/CH4, H2/C3H8 mixtures at 100 °C and 2 bar, the mixture separation factors of H2/CO2, H2/CH4, and H2/C3H8 are 5.6, 44.0, 328.6, with a H2 permeance of about 1.1 × 10-7 mol m-2 s-1 Pa-1, which is promising for potential applications in hydrogen purification and separation.
KW - Chemical modification
KW - Hydrogen separation
KW - Metal-organic frameworks (MOFs)
KW - Microwave synthesis
KW - ZIF-8 membranes
UR - http://www.scopus.com/inward/record.url?scp=84926013382&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2015.03.020
DO - 10.1016/j.seppur.2015.03.020
M3 - Article
AN - SCOPUS:84926013382
VL - 146
SP - 68
EP - 74
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
ER -