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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 8    August 2017

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A hybrid zeolitic imidazolate framework Co-IM-mIM membrane for gas separation
GAO Zheng-cai(高正才)1, LI Li-qing(李立清)1, LI Hai-long(李海龙)1,CHEN Ruo-fei(陈若菲)1, WANG S2, WANG Yang-gang(王阳刚)3

1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth WA 6845, Australia;
3. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China

Abstract:A zeolitic imidazolate hybrid membrane (Co-IM-mIM) containing two imidazolate ligands deposited on a macroporous α-alumina support was prepared by pre-depositing and secondary growth technique. XRD, TGA and SEM characterizations demonstrate that a stable and thin, but dense and pure-phase Co-IM-mIM membrane can be obtained on the macroporous-alumina discs in Teflon-lined autoclave at 120 °C after pre-depositing by dip-coating at room temperature. No visible cracks, pinholes or other defects were observed on the membrane layer. The gas separation studies of Co-IM-mIM membrane were carried out at 25 °C and 1×105 Pa, showing ideal selectivity of 6.95, 5.25, 3.40 for H2/CO2, H2/N2 and H2/CH4, respectively, and a permeance of 17.37× 10-6 mol/(m2·s·Pa) for H2. The influence of temperature and trans-membrane pressure on hydrogen separation and permeation was also carried out. The gas permeation and selectivity demonstrate that this membrane may have potential applications for efficient H2 separation.

 

Key words: Co-IM-mIM membrane; secondary growth; gas permeation; separation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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