期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 121, 期 1-3, 页码 138-144出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2009.01.019
关键词
Zeolite; Secondary growth; Gas separation; Methane; Carbon dioxide
类别
资金
- Universiti Sains Malaysia Research Fund
- Ministry of Science Technology and Innovation of Malaysia
Silicalite-1, Na-ZSM-5 and B-ZSM-5 zeolite crystals were grown on a mesoporous silica layer to form MFI zeolite asymmetric layer for separation of CO2 from CO2/CH4 binary mixture. Silicalite-1 demonstrated the highest crystallinity followed by B-ZSM-5 and Na-ZSM-5. The cubical and rectangular MFI zeolite crystal structures exhibited random orientation. The crystals appeared to interlock and entwine with each other to form a continuously polycrystalline film covering the surface of the silica support. Results from the permeation test indicated that the selectivity and permeation flux of CO2 decreased as the temperature was increased but they increased with increase in pressure. B-ZSM-5 showed the highest CO2/CH4 selectivity of 8.17 followed by Na-ZSM-5 and silicalite-1 crystals with selectivity of 6.28 and 2.23, respectively. (C) 2009 Elsevier Inc. All rights reserved.
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