期刊
JOURNAL OF MEMBRANE SCIENCE
卷 397, 期 -, 页码 87-91出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2012.01.013
关键词
Diffusion selectivity; Hindering effects; Cage-type materials; ZIF-8; Mixture permeation; CO2 capture
资金
- DFG (Deutsche Forschungsgemeinschaft) [1362]
- Center for Gas Separations Relevant to Clean Energy Technologies, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001015]
Cage-type micro-porous materials such as LTA, CHA, SAPO-34, DDR, ERI, ZIF-7, and ZIF-8 have significant potential for use in membrane technologies for CO2 capture. The permeation selectivities are governed by a combination of adsorption and diffusion selectivities, each of which can be separately manipulated. In this study we have investigated the characteristics of CO2/CH4 mixture diffusion in ZIF-8 by monitoring the uptake within crystals using infra-red microscopy ( IRM). The uptake profiles were fitted to determine the effective Fick diffusivities of the individual components in the mixture. The diffusivity measurements, conducted for a range of loadings, clearly demonstrate that the preponderance of CO2 at the window regions of ZIF-8 hinders the inter-cage transport of partner CH4 molecules. Such hindering effects serve to enhance the CO2/CH4 permeation selectivities across ZIF-8 membranes for high mixture loadings within the membrane above values anticipated on the basis of unary permeances. (C) 2012 Elsevier B.V. All rights reserved.
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