Hetero-epitaxial growth of chabazite zeolite membranes using an RHO-type seed layer
| Autor: | Zhang Huizhi, Xiangshu Chen, Tian Gui, Hidetoshi Kita, Gan Lai, Na Hu, Chen Zhudan, Bo Liu, Xiaowei Wu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Chabazite
Chemistry education Filtration and Separation Mullite 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease 01 natural sciences Biochemistry 0104 chemical sciences law.invention Membrane Chemical engineering Aluminosilicate law medicine General Materials Science Dehydration Pervaporation Physical and Theoretical Chemistry Crystallization 0210 nano-technology Zeolite |
| Zdroj: | Journal of Membrane Science. 635:119465 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/j.memsci.2021.119465 |
| Popis: | High-quality chabazite (CHA) zeolite membranes were synthesized from organotemplate-free aluminosilicate gel via epitaxial growth using RHO-type seed layer. Both zeolite RHO seeds (Si/Al = 2.4) and the synthetic gel containing cesium species led to the formation of the CHA zeolite with a high Si/Al ratio of 3.0 and a short synthesis time of 12 h. The effects of seed particles and crystallization time on membrane formation, pervaporation performance, and acid resistance were also investigated. The obtained CHA@RHO membrane prepared using commercial tubular mullite support showed a high flux of 2.3 kg m−2 h−1 and a good separation factor of 3500 for 10/90 wt% water/ethanol mixture at 348 K, which are comparable to those of homogeneous CHA membranes crystallized in organotemplate-free systems from previous reports. Moreover, these membranes were stable for the dehydration of acidic aqueous ethanol solution (with a pH value of 3.0) at 348 K for 8 d. |
| Databáze: | OpenAIRE |
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