Highly selective sieving of small gas molecules by using an ultra-microporous metal–organic framework membrane

Type
Article

Authors
Kang, Zixi
Xue, Ming
Fan, Lili
Huang, Lin
Guo, Lijia
Wei, Guoying
Chen, Banglin
Qiu, Shilun

KAUST Grant Number
CRG-1-2012-LAI-009

Date
2014-09-12

Abstract
© 2014 The Royal Society of Chemistry. Two tailor-made microporous metal-organic framework (MOF) membranes were successfully fabricated on nickel screens by secondary growth. The effect of pore structures on gas separation was examined by means of single and binary gas permeation tests. The MOF JUC-150 membrane with its ultra-micropores showed marked preferential permeance to H2 relative to other gas molecules. The selectivity factors of this membrane were 26.3, 17.1 and 38.7 for H2/CH4, H2/N2 and H2/CO2, respectively, at room temperature. To the best of our knowledge, these values represent unprecedentedly high separation selectivity among those for all MOF membranes reported to date. The JUC-150 membrane also shows high thermal stability and outstanding separation performance at a high temperature of 200 °C. The separation performance of these membranes persists even after more than 1 year exposure to air. The superiority of the tailored pore size, high selectivity for H2 over other gases, significant stability and recyclability make these materials potential candidates for industrial H2 recycling applications.

Citation
Kang Z, Xue M, Fan L, Huang L, Guo L, et al. (2014) Highly selective sieving of small gas molecules by using an ultra-microporous metal–organic framework membrane. Energy Environ Sci 7: 4053–4060. Available: http://dx.doi.org/10.1039/c4ee02275k.

Acknowledgements
This work was supported by the National Natural Science Foundation of China (21390394), the National Basic Research Program of China (2012CB821700 and 2011CB808703), the NSFC (21101072, 21261130584, and 91022030), the "111" project (B07016), and the Award Project of KAUST (CRG-1-2012-LAI-009). Sincere gratitude goes to Dr Yanshuo Li and Dr Wenling Chu (the Dalian Institute of Chemical Physics, Chinese Academy of Sciences) for making high temperature gas permeance measurements possible.

Publisher
Royal Society of Chemistry (RSC)

Journal
Energy Environ. Sci.

DOI
10.1039/c4ee02275k

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