期刊
JOURNAL OF MEMBRANE SCIENCE
卷 356, 期 1-2, 页码 58-69出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2010.03.027
关键词
Adsorbent/membrane hybrid (AMH) system; MTES membrane; Zeolite 5A; Hydrogen separation
资金
- Seoul RBD Program
- Korea Evaluation Institute of Industrial Technology (KEIT) [2005-N-CT-HM-E-01-0000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A hitherto unknown adsorbent/membrane hybrid (AMH) system was developed to enhance the hydrogen separation performance, especially selectivity. The basic idea of this system is to embed zeolite 5A (adsorbent) into a tubular-type methyltriethoxysilane templating silica membrane (MTES membrane) structurally analogous to well-known catalytic-packed membrane reactors. As case studies, transient and pseudo-steady-state permeation/separation performances of AMH system were investigated by using three H-2 binary mixtures, H-2/CH4, H-2/N-2 and H-2/CO (50:50 vol.%). The separation characteristics were ascribed to the molecular size/structure as well as to the adsorption affinity of each molecule due to the mechanisms of steric hindrance, surface diffusion and adsorption equilibrium in the AMH system. In the mixtures which are mainly affected by kinetic separation in the MTES membrane (outside), such as H-2/CH4 and H-2/N-2, the AMH system enhances the H-2 selectivity (H-2/CH4: 109.8-199.0, H-2/N-2: 28.2-55.0) owing to synergy effect with the equilibrium separation in an adsorbent bed (inside). Alternatively, in the mixture which is dominated by equilibrium separation in the MTES membrane, such as H-2/CO, H-2 selectivity of the AMH system (H-2/CO: 14.0-32.0) became worse. A rigorous mathematical model, which combined the tubular-type membrane model with the packed adsorption bed model, could successfully predict the transient and pseudo-steady-state permeation/separation in the AMH system. (C) 2010 Elsevier B.V. All rights reserved.
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